Our Experts

Journal Articles

1. Guoliang Feng, Yiqiao Li, Andre Y.C. Tok and Stephen G. Ritchie (2025) “Infrastructure-based sensor fusion for acquiring gross vehicle weight rating classifications”, Transportation Research Interdisciplinary Perspectives, 32, p. 101535. Available at: 10.1016/j.trip.2025.101535. [ITS-Irvine record]
2. Guoliang Feng, Craig Ross Rindt and Stephen G. Ritchie (2025) “From Diesel to Electric: Potential of Drayage Trucks Transition in Southern California”, iScience, p. 112629. Available at: 10.1016/j.isci.2025.112629. [ITS-Irvine record]
3. Yiqiao Li, Andre Y. C. Tok and Stephen G. Ritchie (2025) “Adaptive Self-Learning Framework for Resilient Vehicle Classification Through the Integration of Inductive Loops and LiDAR Sensors”, IEEE Open Journal of Intelligent Transportation Systems, 6, pp. 768–780. Available at: 10.1109/OJITS.2025.3575808. [ITS-Irvine record]
4. Yiqiao Li, Andre Y. C. Tok, Guoliang Feng and Stephen G. Ritchie (2024) “Real-time truck characterization system: A pilot implementation of the Freight Mobility Living Laboratory (FML2)”, Transportation Research Interdisciplinary Perspectives, 27, p. 101212. Available at: 10.1016/j.trip.2024.101212. [ITS-Irvine record]
5. Youngeun Bae, Craig R. Rindt, Suman Kumar Mitra and Stephen G. Ritchie (2024) “Fleet operator perspectives on alternative fuels for heavy-duty vehicles”, Transport Policy, 149, pp. 36–48. Available at: 10.1016/j.tranpol.2024.01.023. [ITS-Irvine record]
6. Youngeun Bae, Craig Ross Rindt, Suman Kumar Mitra and Stephen G. Ritchie (2023) “Fleet Operator Perspectives on Heavy-duty Vehicle Alternative Fueling Infrastructure”, Transportation Research Record: Journal of the Transportation Research Board, 2678(1). Available at: 10.1177/03611981231171150. [ITS-Irvine record]
7. Yiqiao Li, Andre Y. C. Tok, Zhe Sun, Stephen G. Ritchie and Koti Reddy Allu (2023) “LiDAR Vehicle Point Cloud Reconstruction Framework for Axle-Based Classification”, IEEE Sensors Journal, 23(11), pp. 11168–11180. Available at: 10.1109/JSEN.2023.3235301. [ITS-Irvine record]
8. Yingji Xia, Zhe Sun, Andre Tok and Stephen Ritchie (2022) “A dense background representation method for traffic surveillance based on roadside LiDAR”, Optics and Lasers in Engineering, 152, p. 106982. Available at: 10.1016/j.optlaseng.2022.106982. [ITS-Irvine record]
9. Yiqiao Li, Andre Tok and Stephen G. Ritchie (2022) “Deep Ensemble Neural Network Approach for Federal Highway Administration Axle-Based Vehicle Classification Using Advanced Single Inductive Loops”, Transportation Research Record, 2676(3), pp. 1–16. Available at: 10.1177/03611981211049142. [ITS-Irvine record]
10. Youngeun Bae, Suman Kumar Mitra, Craig R. Rindt and Stephen G. Ritchie (2022) “Factors influencing alternative fuel adoption decisions in heavy-duty vehicle fleets”, Transportation Research Part D: Transport and Environment, 102, p. 103150. Available at: 10.1016/j.trd.2021.103150. [ITS-Irvine record]
11. Suman Mitra, Mingqi Yao and Stephen G. Ritchie (2021) “Gender differences in elderly mobility in the United States”, Transportation Research Part A: Policy and Practice, 154, pp. 203–226. Available at: 10.1016/j.tra.2021.10.015. [ITS-Irvine record]
12. Yiqiao Li, Koti Reddy Allu, Zhe Sun, Andre Y. C. Tok, Guoliang Feng and Stephen G. Ritchie (2021) “Truck body type classification using a deep representation learning ensemble on 3D point sets”, Transportation Research Part C: Emerging Technologies, 133, p. 103461. Available at: 10.1016/j.trc.2021.103461. [ITS-Irvine record]
13. Jaeyoung Jung, Andre Tok and Stephen G. Ritchie (2021) “Determining optimal sensor locations under uncertainty for a truck activity monitoring system on California freeways”, Journal of Intelligent Transportation Systems, 25(3), pp. 221–234. Available at: 10.1080/15472450.2019.1579094. [ITS-Irvine record]
14. Daniel Rodriguez-Roman and Stephen G. Ritchie (2020) “Surrogate-based optimization for multi-objective toll design problems”, Transportation Research Part A: Policy and Practice, 137, pp. 485–503. Available at: 10.1016/j.tra.2018.11.014. [ITS-Irvine record]
15. Adrian Rey, Wen-Long Jin and Stephen G. Ritchie (2019) “An extension of Newell's simplified kinematic wave model to account for first-in-first-out violation: With an application to vehicle trajectory estimation”, Transportation Research Part C: Emerging Technologies, 109, pp. 79–94. Available at: 10.1016/j.trc.2019.10.005. [ITS-Irvine record]
16. Soyoung Iris You and Stephen G. Ritchie (2019) “Tour-based truck demand modeling with entropy maximization using GPS data”, Journal of Advanced Transportation, 2019, pp. 1–11. Available at: 10.1155/2019/5021026. [ITS-Irvine record]
17. Kyung (Kate) Hyun, Kyungsoo Jeong, Andre Tok and Stephen G. Ritchie (2019) “Assessing crash risk considering vehicle interactions with trucks using point detector data”, Accident Analysis & Prevention, 130, pp. 75–83. Available at: 10.1016/j.aap.2018.03.002. [ITS-Irvine record]
18. Daniel Rodriguez-Roman and Stephen G. Ritchie (2019) “Surrogate-based optimization for the design of area charging schemes under environmental constraints”, Transportation Research Part D: Transport and Environment, 72, pp. 162–186. Available at: 10.1016/j.trd.2019.04.015. [ITS-Irvine record]
19. Yiqiao Li, Andre Y.C. Tok and Stephen G. Ritchie (2019) “Individual truck speed estimation from advanced single inductive loops”, Transportation Research Record, 2673(5), pp. 272–284. Available at: 10.1177/0361198119841289. [ITS-Irvine record]
20. Suman Kumar Mitra, Youngeun Bae and Stephen G. Ritchie (2019) “Use of Ride-Hailing Services among Older Adults in the United States”, Transportation Research Record, 2673(3), pp. 700–710. Available at: 10.1177/0361198119835511. [ITS-Irvine record]
21. Soyoung Iris You and Stephen G. Ritchie (2018) “A GPS data processing framework for analysis of drayage truck tours”, Ksce Journal of Civil Engineering, 22(4), pp. 1454–1465. Available at: 10.1007/s12205-017-0160-6. [ITS-Irvine record]
22. Zhe Sun, Wen-Long Jin and Stephen G. Ritchie (2017) “Simultaneous estimation of states and parameters in Newell's simplified kinematic wave model with Eulerian and Lagrangian traffic data”, Transportation Research Part B: Methodological, 104, pp. 106–122. Available at: 10.1016/j.trb.2017.06.012. [ITS-Irvine record]
23. Kyung (Kate) Hyun, Andre Tok and Stephen G. Ritchie (2017) “Long distance truck tracking from advanced point detectors using a selective weighted Bayesian model”, Transportation Research Part C: Emerging Technologies, 82, pp. 24–42. Available at: 10.1016/j.trc.2017.06.004. [ITS-Irvine record]
24. Andre Tok, Kyung (Kate) Hyun, Sarah Hernandez, Kyungsoo Jeong, Yue (Ethan) Sun, Craig Rindt and Stephen G. Ritchie (2017) “Truck activity monitoring system for freight transportation analysis”, Transportation Research Record, 2610(1), pp. 97–107. Available at: 10.3141/2610-11. [ITS-Irvine record]
25. Kyung (Kate) Hyun and Stephen G. Ritchie (2017) “Sensor location decision model for truck flow measurement”, Transportation Research Record, 2644(1), pp. 1–10. Available at: 10.3141/2644-01. [ITS-Irvine record]
26. Daniel Rodriguez Roman and Stephen G. Ritchie (2016) “Accounting for population exposure to vehicle-generated pollutants and environmental equity in the toll design problem”, International Journal of Sustainable Transportation, 11(6), pp. 406–421. Available at: 10.1080/15568318.2016.1266423. [ITS-Irvine record]
27. Sarah V. Hernandez, Andre Tok and Stephen G. Ritchie (2016) “Integration of Weigh-in-Motion (WIM) and inductive signature data for truck body classification”, Transportation Research Part C: Emerging Technologies, 68, pp. 1–21. Available at: 10.1016/j.trc.2016.03.003. [ITS-Irvine record]
28. Soyoung Iris You, Joseph Y.J. Chow and Stephen G. Ritchie (2016) “Inverse vehicle routing for activity-based urban freight forecast modeling and city logistics”, Transportmetrica A: Transport Science, 12(7), pp. 650–673. Available at: 10.1080/23249935.2016.1189723. [ITS-Irvine record]
29. Kyungsoo Jeong, Andre Tok, Stephen G. Ritchie and Junhyeong Park (2016) “California vehicle inventory and use survey: Pilot study insights”, Transportation Research Record, 2547(1), pp. 32–40. Available at: 10.3141/2547-06. [ITS-Irvine record]
30. Miyuan Zhao, Joseph Y.J. Chow and Stephen G. Ritchie (2015) “An inventory-based simulation model for annual-to-daily temporal freight assignment”, Transportation Research Part E: Logistics and Transportation Review, 79, pp. 83–101. Available at: 10.1016/j.tre.2015.04.001. [ITS-Irvine record]
31. Kyung (Kate) Hyun, Sarah Hernandez, Andre Tok and Stephen G. Ritchie (2015) “Truck body configuration volume and weight distribution. Estimation by Using Weigh-in-Motion Data”, Transportation Research Record, 2478(1), pp. 103–112. Available at: 10.3141/2478-12. [ITS-Irvine record]
32. Sarah Hernandez and Stephen G. Ritchie (2015) “Motivating students to pursue transportation careers. Implementation of Service-Learning Project on Transit”, Transportation Research Record, 2480(1), pp. 30–37. Available at: 10.3141/2480-04. [ITS-Irvine record]
33. Joseph Y.J. Chow, Stephen G. Ritchie and Kyungsoo Jeong (2014) “Nonlinear inverse optimization for parameter estimation of commodity-vehicle-decoupled freight assignment”, Transportation Research Part E: Logistics and Transportation Review, 67, pp. 71–91. Available at: 10.1016/j.tre.2014.04.004. [ITS-Irvine record]
34. Daniel Rodriguez-Roman, Neda Masoud, Kyungsoo Jeong and Stephen G. Ritchie (2014) “Goal programming approach to allocate freight analysis framework mode flow data”, Transportation Research Record, 2411(1), pp. 82–89. Available at: 10.3141/2411-10. [ITS-Irvine record]
35. Fatemeh Ranaiefar, Joseph Y.J. Chow, Daniel Rodriguez-Roman, Pedro V. Camargo and Stephen G. Ritchie (2013) “Structural commodity generation model that uses public data. Geographic Scalability and Supply Chain Elasticity Analysis”, Transportation Research Record, 2378(1), pp. 73–83. Available at: 10.3141/2378-08. [ITS-Irvine record]
36. Gunwoo Lee, Soyoung (Iris) You, Stephen G. Ritchie, Jean-Daniel Saphores, R. Jayakrishnan and Oladele Ogunseitan (2012) “Assessing air quality and health benefits of the Clean Truck Program in the Alameda corridor, CA”, Transportation Research Part A: Policy and Practice, 46(8), pp. 1177–1193. Available at: 10.1016/j.tra.2012.05.005. [ITS-Irvine record]
37. Shin-Ting (Cindy) Jeng, K.S. Nesamani and Stephen G. Ritchie (2012) “A new approach to estimate vehicle emissions using inductive loop detector data”, Journal of Intelligent Transportation Systems, 17(3), pp. 179–190. Available at: 10.1080/15472450.2012.712495. [ITS-Irvine record]
38. Andre Y.C. Tok, Miyuan Zhao, Joseph Y.J. Chow, Stephen Ritchie and Dmitri Arkhipov (2011) “Online data repository for statewide freight planning and analysis”, Transportation Research Record, 2246(1), pp. 121–129. Available at: 10.3141/2246-15. [ITS-Irvine record]
39. S. Park and S.G. Ritchie (2010) “Innovative single-loop speed estimation model with advanced loop data”, IET Intelligent Transport Systems, 4(4), pp. 232–243. Available at: 10.1049/iet-its.2009.0126. [ITS-Irvine record]
40. Shin-Ting Jeng, Yeow Chern Andre Tok and Stephen G. Ritchie (2010) “Freeway corridor performance measurement based on vehicle reidentification”, IEEE Trans. Intell. Transport. Syst., 11(3), pp. 639–646. Available at: 10.1109/tits.2010.2049105. [ITS-Irvine record]
41. Soyoung (Iris) You, Gunwoo Lee, Stephen G. Ritchie, Jean-Daniel Saphores, Mana Sangkapichai and Roberto Ayala (2010) “Air pollution impacts of shifting freight from truck to rail at California's San Pedro bay ports”, Transportation Research Record, 2162(1), pp. 25–34. Available at: 10.3141/2162-04. [ITS-Irvine record]
42. Gunwoo Lee, Soyoung (Iris) You, Stephen G. Ritchie, Jean-Daniel Saphores, Mana Sangkapichai and R. Jayakrishnan (2009) “Environmental impacts of a major freight corridor. A Study of I-710 in California”, Transportation Research Record, 2123(1), pp. 119–128. Available at: 10.3141/2123-13. [ITS-Irvine record]
43. Seri Park and Stephen G. Ritchie (2009) “Automated real-time vehicle classifier development based on vehicle signature”, IJGCRSIS, 1(2), p. 164. Available at: 10.1504/ijgcrsis.2009.028007. [ITS-Irvine record]
44. Shin-Ting (Cindy) Jeng and Stephen G. Ritchie (2008) “Real-time vehicle classification using inductive loop signature data”, Transportation Research Record, 2086(1), pp. 8–22. Available at: 10.3141/2086-02. [ITS-Irvine record]
45. Cheol Oh, Stephen G Ritchie and Shin-Ting Jeng (2007) “Anonymous vehicle reidentification using heterogeneous detection systems”, IEEE Trans. Intell. Transport. Syst., 8(3), pp. 460–469. Available at: 10.1109/tits.2007.899720. [ITS-Irvine record]
46. Cheol Oh and Stephen G. Ritchie (2007) “Recognizing vehicle classification information from blade sensor signature”, Pattern Recognition Letters, 28(9), pp. 1041–1049. Available at: 10.1016/j.patrec.2007.01.010. [ITS-Irvine record]
47. Cheol Oh, Seri Park and Stephen G. Ritchie (2006) “A method for identifying rear-end collision risks using inductive loop detectors”, Accident Analysis & Prevention, 38(2), pp. 295–301. Available at: 10.1016/j.aap.2005.09.009. [ITS-Irvine record]
48. C. Oh, A. Tok and S.G. Ritchie (2005) “Real-time freeway level of service using inductive-signature-based vehicle reidentification system”, IEEE Trans. Intell. Transport. Syst., 6(2), pp. 138–146. Available at: 10.1109/tits.2005.848360. [ITS-Irvine record]
49. Jun-Seok Oh, Cheol Oh, Stephen G. Ritchie and Myungsoon Chang (2005) “Real-time estimation of accident likelihood for safety enhancement”, Journal of transportation engineering, 131(5), pp. 358–363. [ITS-Irvine record]
50. Cheol Oh and Stephen G. Ritchie (2005) “Development of methodology to design advanced traffic surveillance systems for traffic information based on Or­i­gin-Des­tin­a­tion”, Transportation Research Record, 1935(1), pp. 37–46. Available at: 10.1177/0361198105193500105. [ITS-Irvine record]
51. Cheol Oh, Jun-Seok Oh and Stephen G. Ritchie (2005) “Real-time hazardous traffic condition warning system: Framework and evaluation”, IEEE Transactions on Intelligent Transportation Systems, 6(3), pp. 265–272. [ITS-Irvine record]
52. Cheol Oh, Stephen G. Ritchie and Jun-Seok Oh (2005) “Exploring the relationship between data aggregation and predictability to provide better predictive traffic information”, Transportation Research Record, 1935(1), pp. 28–36. Available at: 10.1177/0361198105193500104. [ITS-Irvine record]
53. C.C. Sun, G.S. Arr, R.P. Ramachandran and S.G. Ritchie (2004) “Vehicle reidentification using multidetector fusion”, IEEE Trans. Intell. Transport. Syst., 5(3), pp. 155–164. Available at: 10.1109/tits.2004.833770. [ITS-Irvine record]
54. Carlos Sun, Stephen G. Ritchie and Seri Oh (2003) “Inductive classifying artificial network for vehicle type categorization”, Comp-aided Civil Eng, 18(3), pp. 161–172. Available at: 10.1111/1467-8667.00307. [ITS-Irvine record]
55. Cheol Oh and Stephen G. Ritchie (2003) “Anonymous vehicle tracking for real-time traffic surveillance and performance on signalized arterials”, Transportation Research Record, 1826(1), pp. 37–44. Available at: 10.3141/1826-06. [ITS-Irvine record]
56. Filippo Logi and Stephen G Ritchie (2002) “A multi-agent architecture for cooperative inter-jurisdictional traffic congestion management”, Transportation Research Part C: Emerging Technologies, 10(5-6), pp. 507–527. Available at: 10.1016/s0968-090x(02)00033-5. [ITS-Irvine record]
57. Seri Oh, Stephen G. Ritchie and Cheol Oh (2002) “Real-time traffic measurement from single loop inductive signatures”, Transportation Research Record, 1804(1), pp. 98–106. Available at: 10.3141/1804-14. [ITS-Irvine record]
58. Cheol Oh and Stephen G. Ritchie (2002) “Real-time inductive-signature-based level of service for signalized intersections”, Transportation Research Record, 1802(1), pp. 97–104. Available at: 10.3141/1802-12. [ITS-Irvine record]
59. Filippo Logi and Stephen G. Ritchie (2001) “Development and evaluation of a knowledge-based system for traffic congestion management and control”, Transportation Research Part C: Emerging Technologies, 9(6), pp. 433–459. Available at: 10.1016/s0968-090x(01)00002-x. [ITS-Irvine record]
60. H.M. Zhang, Stephen G. Ritchie and R. Jayakrishnan (2001) “Coordinated traffic-responsive ramp control via nonlinear state feedback”, Transportation Research Part C: Emerging Technologies, 9(5), pp. 337–352. Available at: 10.1016/s0968-090x(00)00044-9. [ITS-Irvine record]
61. Filippo Logi, Craig R. Rindt, Michael G. McNally and Stephen G. Ritchie (2001) “TRICEPS-CARTESIUS: Advanced transportation management system test bed for evaluation of interjurisdictional traffic management strategies”, Transportation Research Record, 1748(1), pp. 125–131. Available at: 10.3141/1748-16. [ITS-Irvine record]
62. Jiuh-Biing Sheu and Stephen G. Ritchie (2001) “Stochastic modeling and real-time prediction of vehicular lane-changing behavior”, Transportation Research Part B: Methodological, 35(7), pp. 695–716. [ITS-Irvine record]
63. Patrick Conroy, Steven Shladover, Joy Dahlgren, Pravin Varaiya, Will Recker and Stephen Ritchie (2000) “Intelligent Transportation Systems: Research Products for Public Works Professionals”, Public Works Management & Policy, 5(1), pp. 3–12. Available at: 10.1177/1087724X0051001. [ITS-Irvine record]
64. Carlos Sun and Stephen G. Ritchie (2000) “Heuristic vehicle classification using inductive signatures on freeways”, Transportation Research Record, 1717(1), pp. 130–136. Available at: 10.3141/1717-16. [ITS-Irvine record]
65. Carlos Sun and Stephen G. Ritchie (1999) “Individual vehicle speed estimation using single loop inductive waveforms”, Journal of Transportation Engineering, 125(6), pp. 531–538. Available at: 10.1061/(asce)0733-947x(1999)125:6(531). [ITS-Irvine record]
66. Baher Abdulhai and Stephen G. Ritchie (1999) “Enhancing the universality and transferability of freeway incident detection using a Bayesian-based neural network”, Transportation Research Part C: Emerging Technologies, 7(5), pp. 261–280. Available at: 10.1016/s0968-090x(99)00022-4. [ITS-Irvine record]
67. Carlos Sun, Stephen G. Ritchie, Kevin Tsai and R. Jayakrishnan (1999) “Use of vehicle signature analysis and lexicographic optimization for vehicle reidentification on freeways”, Transportation Research Part C: Emerging Technologies, 7(4), pp. 167–185. Available at: 10.1016/S0968-090X(99)00018-2. [ITS-Irvine record]
68. Baher Abdulhai and Stephen G. Ritchie (1999) “Preprocessor feature extractor and postprocessor probabilistic output interpreter for improved freeway incident detection”, Transportation Research Record, 1678(1), pp. 277–286. Available at: 10.3141/1678-33. [ITS-Irvine record]
69. Jiuh-Biing Sheu and Stephen G. Ritchie (1998) “A new methodology for incident detection and characterization on surface streets”, Transportation Research Part C: Emerging Technologies, 6(5-6), pp. 315–335. Available at: 10.1016/s0968-090x(99)00002-9. [ITS-Irvine record]
70. Sarosh I. Khan and Stephen G. Ritchie (1998) “Statistical and neural classifiers to detect traffic operational problems on urban arterials”, Transportation Research Part C: Emerging Technologies, 6(5-6), pp. 291–314. Available at: 10.1016/s0968-090x(99)00005-4. [ITS-Irvine record]
71. Carlos Sun, Stephen G. Ritchie and Kevin Tsai (1998) “Algorithm development for derivation of section-related measures of traffic system performance using inductive loop detectors”, Transportation Research Record, 1643(1), pp. 171–180. Available at: 10.3141/1643-21. [ITS-Irvine record]
72. H. Michael Zhang and Stephen G. Ritchie (1997) “Freeway ramp metering using artificial neural networks”, Transportation Research Part C: Emerging Technologies, 5(5), pp. 273–286. Available at: 10.1016/s0968-090x(97)00019-3. [ITS-Irvine record]
73. Mohamed Kaseko, Stephen G. Ritchie and Zhen-Ping Lo (1997) “Evaluation of two automated thresholding techniques for pavement images”, NDT & E International, 30(5), p. 333. Available at: 10.1016/s0963-8695(97)82186-x. [ITS-Irvine record]
74. Carlos Sun, Wilfred Recker, Stephen Ritchie, Brian Gallagher, Eric Shen and John Thai (1997) “OAK-TREE: One-of-a-kind traffic research and education experiment”, Transportation Research Record, 1603(1), pp. 106–111. Available at: 10.3141/1603-14. [ITS-Irvine record]
75. Hongjun Zhang, Stephen G. Ritchie and Zhen-Ping Lo (1997) “Macroscopic modeling of freeway traffic using an artificial neural network”, Transportation Research Record, 1588(1), pp. 110–119. Available at: 10.3141/1588-14. [ITS-Irvine record]
76. H. Zhang, S. G. Ritchie and W. W. Recker (1996) “Some general results on the optimal ramp control problem”, Transportation Research Part C: Emerging Technologies, 4(2), pp. 51–69. Available at: 10.1016/0968-090X(96)00002-2. [ITS-Irvine record]
77. R.D. Kuhne, J. Palen, C. Gardner and S.G. Ritchie (1996) “Section-related measures of traffic system performance”, Transportation Research Record [Preprint]. [ITS-Irvine record]
78. Ruey L. Cheu and Stephen G. Ritchie (1995) “Automated detection of lane-blocking freeway incidents using artificial neural networks”, Transportation Research Part C: Emerging Technologies, 3(6), pp. 371–388. Available at: 10.1016/0968-090x(95)00016-c. [ITS-Irvine record]
79. Mohamed S. Kaseko, Zhen-Ping Lo and Stephen G. Ritchie (1994) “Comparison of traditional and neural classifiers for Pavement-Crack detection”, Journal of Transportation Engineering, 120(4), pp. 552–569. Available at: 10.1061/(asce)0733-947x(1994)120:4(552). [ITS-Irvine record]
80. Sarosh I. Khan, Stephen G. Ritchie and Karl Kampe (1994) “Integrated system to develop highway rehabilitation projects”, Journal of Transportation Engineering, 120(1), pp. 1–20. Available at: 10.1061/(asce)0733-947x(1994)120:1(1). [ITS-Irvine record]
81. Ruey L. Cheu, Wilfred W. Recker and Stephen G. Ritchie (1994) “Calibration of INTRAS for simulation of 30-sec loop detector output”, Transportation Research Record, (1457), pp. 208–215. [ITS-Irvine record]
82. Hongjun Zhang and Stephen G. Ritchie (1994) “Real-Time Decision-Support system for freeway management and control”, Journal of Computing in Civil Engineering, 8(1), pp. 35–51. Available at: 10.1061/(asce)0887-3801(1994)8:1(35). [ITS-Irvine record]
83. Mohamed S. Kaseko and Stephen G. Ritchie (1993) “A neural network-based methodology for pavement crack detection and classification”, Transportation Research Part C: Emerging Technologies, 1(4), pp. 275–291. Available at: 10.1016/0968-090x(93)90002-w. [ITS-Irvine record]
84. Stephen G. Ritchie (1993) “Foreword”, Transportation Research Part C: Emerging Technologies, 1(1), p. 1. Available at: 10.1016/0968-090x(93)90016-9. [ITS-Irvine record]
85. Stephen G. Ritchie and Robert Stack (1993) “A real-time expert system for freeway incident management in Orange County, California”, Computing in Civil and Building Engineering, pp. 607–613. [ITS-Irvine record]
86. Stephen G. Ritchie and Ruey L. Cheu (1993) “Simulation of freeway incident detection using artificial neural networks”, Transportation Research Part C: Emerging Technologies, 1(3), pp. 203–217. [ITS-Irvine record]
87. Stephen G. Ritchie (1992) “Closure to “ digital imaging concepts and applications in pavement management ” by Stephen G. Ritchie (May/June, 1990, vol. 116, no. 3)”, Journal of Transportation Engineering, 118(4), pp. 603–605. Available at: 10.1061/(asce)0733-947x(1992)118:4(603.2). [ITS-Irvine record]
88. Stephen G. Ritchie (1990) “Digital imaging concepts and applications in pavement management”, Journal of Transportation Engineering, 116(3), pp. 287–298. Available at: 10.1061/(asce)0733-947x(1990)116:3(287). [ITS-Irvine record]
89. S.G. Ritchie and N.A. Prosser (1990) “A Real-Time Expert System Approach to Freeway Incident Management”, Transportation Research Record, 1320, pp. 7–16. [ITS-Irvine record]
90. S.G. Ritchie, M. Kaseko and B. Bavarian (1990) “Development of an intelligent system for automated pavement evaluation”, Transportation Research Record, 1311, pp. 112–119. [ITS-Irvine record]
91. Stephen G. Ritchie (1990) “A Knowledge-Based Decision Support Architecture for Advanced Traffic Management”, Transportation Research Part A: General, 24(1), pp. 27–37. Available at: 10.1016/0191-2607(90)90068-h. [ITS-Irvine record]
92. N.A. Prosser and S. G Ritchie (1990) “Real-Time Knowledge-Based Integration of Freeway Surveillance Data”, Transportation Research Record, 1320, pp. 40–46. [ITS-Irvine record]
93. Stephen G. Ritchie (1990) “Expert systems in transportation”, Transportation Research Part A: General, 24(1), p. 1. Available at: 10.1016/0191-2607(90)90065-e. [ITS-Irvine record]
94. Stephen G. Ritchie and Joe P. Mahoney (1989) “Development and performance of an expert system for pavement overlay design”, Civil Engineering Systems, 6(1-2), pp. 58–63. Available at: 10.1080/02630258908970544. [ITS-Irvine record]
95. Stephen G Ritchie (1989) “Issues and problems of moving goods in urban areas”, Journal of Transportation Engineering, 115(1), pp. 4–19. Available at: 10.1061/(asce)0733-947x(1989)115:1(4). [ITS-Irvine record]
96. Stephen G. Ritchie, Louis F. Cohn and Roswell A. Harris (1988) “Development of expert systems technology in the California Department of Transporation”, Transportation Research Record, (1187), pp. 21–29. Available at: https://onlinepubs.trb.org/Onlinepubs/trr/1988/1187/1187-003.pdf. [ITS-Irvine record]
97. Stephen G. Ritchie (1987) “Expert systems in pavement management”, Transportation Research Part A: General, 21(2), pp. 145–152. Available at: 10.1016/0191-2607(87)90007-0. [ITS-Irvine record]
98. Stephen G. Ritchie, Che-I Yeh, Joe P. Mahoney and Newton C. Jackson (1987) “Surface condition expert system for pavement rehabilitation planning”, Journal of Transportation Engineering, 113(2), pp. 155–167. Available at: 10.1061/(asce)0733-947x(1987)113:2(155). [ITS-Irvine record]
99. Stephen G. Ritchie (1987) “Knowledge-based approach to pavement overlay design”, Transportation Research Record, (1145), pp. 61–68. [ITS-Irvine record]
100. Che-I Yeh, Stephen G Ritchie and Jerry B Schneider (1986) “Potential Applications of Knowledge-Based Expert Systems in Transportation Planning and Engineering”, Transportation Research Record: Journal of the Transportation Research Board, (1076), pp. 59–65. Available at: http://onlinepubs.trb.org/Onlinepubs/trr/1986/1076/1076-009.pdf. [ITS-Irvine record]
101. Stephen G. Ritchie (1986) “Statistical approach to statewide traffic counting.”, Transportation Research Record, pp. 14–21. [ITS-Irvine record]
102. Stephen G. Ritchie, Che-I. Yeh, Joe P. Mahoney and Newton C. Jackson (1986) “Development of an expert system for pavement rehabilitation decision making.”, Transportation Research Record, pp. 96–103. [ITS-Irvine record]
103. Stephen G. Ritchie and Mark E. Hallenbeck (1986) “Evaluation of a statewide highway data collection program.”, Transportation Research Record, pp. 27–35. Available at: https://onlinepubs.trb.org/Onlinepubs/trr/1986/1090/1090-005.pdf. [ITS-Irvine record]
104. Stephen G. Ritchie (1983) “Application of counting distribution for high-variance urban traffic counts.”, Transportation Research Record, (905), pp. 27–33. Available at: https://onlinepubs.trb.org/Onlinepubs/trr/1983/905/905-005.pdf. [ITS-Irvine record]
105. Stephen G. Ritchie (1983) “Application of counting distribution for high-variance urban traffic counts.”, Transportation Research Record, (905), pp. 27–33. Available at: https://onlinepubs.trb.org/Onlinepubs/trr/1983/905/905-005.pdf. [ITS-Irvine record]
106. Mark A. Turnquist, Arnim H. Meyburg and Stephen G. Ritchie (1982) “Innovative transit service planning model that uses a microcomputer.”, Transportation Research Record, pp. 1–6. Available at: https://onlinepubs.trb.org/Onlinepubs/trr/1982/854/854-001.pdf. [ITS-Irvine record]
107. W. Young, S.G. Ritchie and K.W. Ogden (1980) “Factors that influence freight-facility location preference”, Transportation Research Record, (747), pp. 71–77. Available at: https://onlinepubs.trb.org/Onlinepubs/trr/1980/747/747-015.pdf. [ITS-Irvine record]
108. W. Young, S.G. Ritchie and K.W. Ogden (1980) “Factors that influence freight-facility location preference”, Transportation Research Record, (747), pp. 71–77. Available at: https://onlinepubs.trb.org/Onlinepubs/trr/1980/747/747-015.pdf. [ITS-Irvine record]
109. S.G. Ritchie (1978) “Arterial bus lane warrants”, Australian Road Research, 8(4), pp. 63–67. [ITS-Irvine record]

Conference Papers

1. Mingqi Yao and Stephen Ritchie (2025) “Analyzing Public Sentiment Variations Toward Electric Vehicles in the United States: Evidence from Twitter”, in Proceedings, 104th Annual Meeting of the Transportation Research Board. Washington, D.C.. [ITS-Irvine record]
2. Youngeun Bae, Craig R Rindt and Stephen Ritchie (2025) “Charging Infrastructure Decisions by Heavy-Duty Vehicle Fleet Operators: An Exploratory Analysis”, in Proceedings, 104th Annual Meeting of the Transportation Research Board. Washington, D.C.. [ITS-Irvine record]
3. Chenyu Yuan, Sara-Grace Lien, Wen-Long Jin and Stephen Ritchie (2025) “Optimizing Prompt Engineering for LLMs in Transportation: A Freeway Segment Analysis Case Study”, in Proceedings, 104th Annual Meeting of the Transportation Research Board. Washington, D.C.. [ITS-Irvine record]
4. Guoliang Feng, Yiqiao Li, Andre Tok and Stephen G. Ritchie (2025) “Advancing Gross Vehicle Weight Rating Classification Through the Integration of Inductive Loop and Side Fire Camera System”, in Proceedings, 104th Annual Meeting of the Transportation Research Board. Washington, D.C.. [ITS-Irvine record]
5. Youngeun Bae, Stephen Ritchie and Craig R Rindt (2025) “Small and Large Fleet Perceptions on Zero-Emission Trucks and Policies”, in Proceedings, 104th Annual Meeting of the Transportation Research Board. Washington, D.C.. [ITS-Irvine record]
6. Youngeun Bae, Stephen Ritchie and Craig R Rindt (2025) “A Choice Experiment Survey of Drayage Fleet Operator Preferences for Zero-Emission Trucks”, in Proceedings, 104th Annual Meeting of the Transportation Research Board. Washington, D.C.. [ITS-Irvine record]
7. Yiqiao Li, Andre Tok and Stephen G. Ritchie (2024) “A Deep Learning Approach for Drayage Truck Identification Using Inductive Loops”, in 2024 Forum for Innovative Sustainable Transportation Systems (FISTS). 2024 Forum for Innovative Sustainable Transportation Systems (FISTS), pp. 1–6. Available at: 10.1109/FISTS60717.2024.10485535. [ITS-Irvine record]
8. Guoliang Feng, Craig Rindt and Stephen Ritchie (2024) “Decarbonization Potential of Drayage Trucks Using Real-world Data in Southern California”. Transportation Research Board 2024 Annual Meeting, Washington, DC. [ITS-Irvine record]
9. Yiqiao Li, Andre Tok, Guoliang Feng and Stephen G. Ritchie (2023) “Real-time Truck Characterization System: A Pilot Implementation of the Freight Mobility Living Laboratory (FML2)”. 102nd Transportation Research Board Annual Meeting 2023. [ITS-Irvine record]
10. Guoliang Feng, Yiqiao Li, Andre Tok and Stephen G. Ritchie (2023) “An Investigation of Classification by Gross Vehicle Weight Rating Categories using Advanced Single Inductive Loops”, in 102nd Annual Meeting of the Transportation Research Board, Washington, D.C.. [ITS-Irvine record]
11. Youngeun Bae, Craig R. Rindt, Suman Mitra and Stephen G. Ritchie (2023) “Fleet Operator Perspectives on Heavy-duty Vehicle Alternative Fueling Infrastructure”. 102nd Transportation Research Board Annual Meeting 2023. [ITS-Irvine record]
12. Yiqiao Li, Andre Tok, Zhe Sun, Stephen G. Ritchie and Koti Reddy Allu (2022) “LiDAR Vehicle Point Cloud Reconstruction Framework for Axle-Based Classification”. 101st Annual Meeting of the Transportation Research Board. [ITS-Irvine record]
13. Yiqiao Li, Andre Tok and Stephen Ritchie (2022) “A Self-Learning Framework for Vehicle Classification System through the Integration of Advanced Inductive Loops and Multi-array LiDAR Sensors”. 101st Annual Meeting of the Transportation Research Board. [ITS-Irvine record]
14. Yiqiao Li, Andre Tok and Stephen Ritchie (2021) “A Deep Ensemble Neural Network Approach for FHWA Axle-based Vehicle Classification using Advanced Single Inductive Loops”. 100th Annual Meeting of the Transportation Research Board (TRB). Available at: https://escholarship.org/uc/item/4sf4v88g (Accessed: October 11, 2023). [ITS-Irvine record]
15. Youngeun Bae, Craig R Rindt, Suman K. Mitra and Stephen G. Ritchie (2021) “Perspectives on Viable Alternative Fuels for Heavy-duty Vehicles in 2030s: Qualitative Interviews with California Fleet Operators”. 100th Transportation Research Board (TRB) Annual Meeting, Washington, DC. [ITS-Irvine record]
16. Yiqiao Li, Koti R Allu, Zhe Sun, Andre Tok, Guoliang Feng and Stephen G. Ritchie (2021) “An Ensemble Approach to Truck Body Type Classification using Deep Representation Learning on 3D Point Sets”. 100th Transportation Research Board (TRB) Annual Meeting, Washington, DC. [ITS-Irvine record]
17. Mingqi Yao, Suman K. Mitra and Stephen G. Ritchie (2021) “Heterogeneities in Older Adults Travel Times and Activity Durations: Analysis of the 2017 NHTS Personal Trip Data”. 100th Transportation Research Board (TRB) Annual Meeting, Washington, DC. [ITS-Irvine record]
18. Suman Mitra, Mingqi Yao and Stephen Ritchie (2020) “Gender differences in travel patterns of the elderly in the united states”, in Proceedings of the 99th annual meeting of the transportation research board. [ITS-Irvine record]
19. Junhyeong Park, Craig Rindt, Andre Tok and Stephen G. Ritchie (2019) “Investigation of the operational characteristics of vocational natural gas vehicles in southern California and their influence on nitrogen oxide emission productions by road type”, in Proceedings of the 98th annual meeting of the transportation research board, p. 8p. [ITS-Irvine record]
20. Youngeun Bae, Suman Kumar Mitra, Craig Ross Rindt and Stephen G. Ritchie (2019) “Factors influencing alternative fuel adoption decisions in heavy-duty vehicle fleets in California”, in The 98th annual meeting of the transportation research board. [ITS-Irvine record]
21. Adrian Rey, Wen-Long Jin and Stephen G. Ritchie (2019) “An extension of newell's simplified kinematic wave model to account for first-in-first-out violation: With an application to vehicle trajectory estimation”, in Proceedings of the 98th annual meeting of the transportation research board, p. 29p. [ITS-Irvine record]
22. Kyungsoo Jeong and Stephen G. Ritchie (2018) “Routing and scheduling problem of container trucks with selective empty container pickup in a shared resource environment”, in Proceedings of the 97th annual meeting of the transportation research board, p. 7p. [ITS-Irvine record]
23. Jaeyoung Jung, Andre Tok and Stephen G. Ritchie (2018) “Determining optimal sensor locations under uncertainty for advanced truck surveillance on California freeways”, in Proceedings of the 97th annual meeting of the transportation research board, p. 6p. [ITS-Irvine record]
24. Kyungsoo Jeong, Kyung (Kate) Hyun and Stephen G. Ritchie (2017) “Influence of personal concerns about travel on travel behavior”, in Proceedings of the 96th annual meeting of the transportation research board, p. 18p. [ITS-Irvine record]
25. Kyung (Kate) Hyun, Kyungsoo Jeong, Andre Tok and Stephen G. Ritchie (2017) “Assessing crash risks considering vehicle interactions with trucks using point detector data”, in Proceedings of the 96th annual meeting of the transportation research board, p. 17p. [ITS-Irvine record]
26. Kyungsoo Jeong and Stephen G. Ritchie (2017) “Local container truck routing problem with its operational flexibility”, in Proceedings of the 96th annual meeting of the transportation research board, p. 18p. [ITS-Irvine record]
27. PV Camargo, AY Tok and SG Ritchie (2016) “Spatial disaggregation of California freight demand for regional planning models”, in ARRB conference, 27th, 2016, melbourne, victoria, australia. [ITS-Irvine record]
28. Kyung (Kate) Hyun, Andre Tok and Stephen G. Ritchie (2016) “Long-distance truck tracking from advanced point detectors using selective weighted Bayesian model”, in Proceedings of the 95th annual meeting of the transportation research board, p. 23p. [ITS-Irvine record]
29. Daniel Rodriguez-Roman and Stephen G. Ritchie (2015) “Accounting for population exposure to pollutants in the toll design problem”, in Proceedings of the 94th annual meeting of the transportation research board, p. 17p. [ITS-Irvine record]
30. Zhe Sun, Wen-Long Jin and Stephen G. Ritchie (2015) “Simultaneous state and parameter estimation in newell's simplified kinematic wave model with heterogeneous data”, in Proceedings of the 94th annual meeting of the transportation research board, p. 22p. [ITS-Irvine record]
31. Sarah Hernandez, Andre Tok and Stephen G. Ritchie (2015) “Multiple-classifier systems for truck body classification at WIM sites with inductive signature data”, in Proceedings of the 94th annual meeting of the transportation research board, p. 21p. [ITS-Irvine record]
32. Jinheoun Choi, Stephen G. Ritchie and Cheol Oh (2015) “Real-time estimation of freeway emissions based on an inductive-loop-based surveillance system”, in Proceedings of the 94th annual meeting of the transportation research board, p. 15p. [ITS-Irvine record]
33. Neda Masoud, Fatemeh Ranaiefar, Michael McNally, Daniel Rodriguez-Roman and Stephen Ritchie (2014) “An alternative method to estimate balancing factors for disaggregation of OD matrices”, in Proceedings of the 93rd annual meeting of the transportation research board, p. 20p. Available at: https://trid.trb.org/view/1288779. [ITS-Irvine record]
34. Pedro V. Camargo, Michael G. McNally and Stephen G. Ritchie (2014) “Exploratory use of raster images as a data source for agricultural commodity transportation modeling”, in Proceedings of the 93rd annual meeting of the transportation research board, p. 16p. [ITS-Irvine record]
35. Fatemeh Ranaiefar, Joseph Y.J. Chow, Michael G. McNally and Stephen G. Ritchie (2014) “A structural direct demand model for inter-regional commodity flow forecasting”, in Proceedings of the 93rd annual meeting of the transportation research board, p. 20p. [ITS-Irvine record]
36. Sarah Hernandez, Andre Tok and Stephen G Ritchie (2014) “Integration of weigh-in-motion and inductive signature technology for advanced truck monitoring”, in 93rd annual meeting of the transportation research board, washington, DC. [ITS-Irvine record]
37. Alma Carillo, S. Hernandez and S.G. Ritchie (2013) “Severity of accidents based on truck body classification”, in Proceedings of the 2013 summer research symposium, UC irvine. [ITS-Irvine record]
38. F. Ranaiefar, J.Y. Chow, D. Rodriguez-Roman, P. Camargo and S.G. Ritchie (2013) “Geographic scalability and supply chain elasticity of a structural commodity generation model using public data”, in Proceedings of the 92nd annual meeting of transportation research board, washington, DC. [ITS-Irvine record]
39. Jinheoun Choi, Stephen G. Ritchie and Cheol Oh (2013) “Methodology for generating individual vehicle speed profile for estimating freeway emissions”, in Proceedings of the 92nd annual meeting of the transportation research board, p. 17p. [ITS-Irvine record]
40. S. Hernandez, A. Tok and S.G. Ritchie (2012) “Real-time density estimation using inductive signature technology”, in Proceedings of the university of california transportation center student conference, UC davis. [ITS-Irvine record]
41. J. Kuo, J. Bui, J. Tong, S. Hernandez and S.G. Ritchie (2012) “Bluetooth OD estimation study: Using Bluetooth technology to determine travel patterns for university setting”, in Proceedings of the university of california transportation center student conference, UC davis. [ITS-Irvine record]
42. Joseph Y.J. Chow and Stephen G. Ritchie (2012) “A freight transshipment network model for forecasting commodity and cyclic commercial vehicle flows”, in Proceedings of the 91st annual meeting of the transportation research board, p. 30p. [ITS-Irvine record]
43. Soyoung Iris You and Stephen G. Ritchie (2012) “Tour behavior of clean drayage trucks in southern California”, in Proceedings of the 91st annual meeting of the transportation research board, p. 18p. [ITS-Irvine record]
44. Hang Liu, Yeow Chern Andre Tok and Stephen G. Ritchie (2011) “Development of a real-time on-road emissions estimation and monitoring system”, in 2011 14th international IEEE conference on intelligent transportation systems (ITSC). IEEE / IEEE, pp. 1821–1826. Available at: 10.1109/itsc.2011.6083006. [ITS-Irvine record]
45. J.Y. Chow, S.G. Ritchie, M. Zhao, F. Ranaiefar, S. You, A. Tok and M.G. McNally (2011) “A conceptual statewide freight forecasting framework for California”, in Proceedings of the 4th METRANS national urban freight conference, Long Beach, California.. [ITS-Irvine record]
46. A. Tok, M.Y. Zhao, J.Y.J. Chow, S.G. Ritchie and D. Arkhipov (2011) “An on-line data repository for statewide freight planning and analysis”, in Proceedings of the 90th annual meeting of the transportation research board, washington, DC. [ITS-Irvine record]
47. Gunwoo Lee, Mana Sangkapichai, Stephen G. Ritchie, Jean-Daniel Saphores, Oladele Ogunseitan, Roberto Ayala, R. Jayakrishnan and Rodolfo Torres (2010) “Assessing the environmental and health impacts of port-related freight movement in a major urban transportation corridor”, in Proceedings of the 89th annual meeting of the transportation research board, p. 15p. [ITS-Irvine record]
48. Yeow Chern Andre Tok and Stephen G. Ritchie (2010) “Vector classification of commercial vehicles using a high-fidelity inductive loop detection system”, in Proceedings of the 89th annual meeting of the transportation research board, p. 22p. [ITS-Irvine record]
49. Roberto Ayala, Jean-Daniel Saphores, Stephen G. Ritchie, Gunwoo Lee and Mana Sangkapichai (2010) “A preliminary analysis of the environmental impacts of the clean truck program in the alameda corridor, California”, in Proceedings of the 89th annual meeting of the transportation research board, p. 16p. [ITS-Irvine record]
50. Mana Sangkapichai, Jean-Daniel Saphores, Oladele Ogunseitan, Stephen G. Ritchie and Gunwoo Lee (2010) “An analysis of health impacts from PM and NOx emissions resulting from train operations in the alameda corridor, California”, in Proceedings of the 89th annual meeting of the transportation research board, p. 19p. [ITS-Irvine record]
51. J. Saphores, M. Sangkapichai, S. Ritchie, G. Lee, I. You and R. Ayala (2009) “An analysis of train emissions and their health impacts in California's alameda corridor”, in Proceedings of INFORMS, san diego, CA. [ITS-Irvine record]
52. Seri Park, Stephen G. Ritchie, Cheol Oh and I.T.S. America (2009) “An innovative single loop speed estimation model with advanced loop data”, in Proceeindgs of the 16th ITS world congress and exhibition on intelligent transport systems and services, stockholm, sweden, p. 13p. [ITS-Irvine record]
53. M. Sangkapichai, J-D Saphores, S. Ritchie, S. You and G. Lee (2009) “Estimating PM and NOx train emissions in the alameda corridor, California”, in Proceedings of the 88th meeting of the transportation research board, washington D.C. [ITS-Irvine record]
54. Andre Tok, Sarah Vavrik Hernandez and Stephen G. Ritchie (2009) “Accurate individual vehicle speeds from single inductive loop signatures”, in Proceedings of the 88th annual meeting of the transportation research board, p. 22p. [ITS-Irvine record]
55. G. Lee, S. You, S.G. Ritchie, J. Saphores, M. Sangkapichai and R. Jayakrishnan (2009) “Environmental impacts of a major freight corridor: A study of the I-710 in California”, in Proceedings of the 89th annual meeting of the transportation research board, washington, DC. [ITS-Irvine record]
56. Mana Sangkapichai, Jean-Daniel Saphores, Stephen G. Ritchie, Soyoung You and Gunwoo Lee (2009) “Analysis of PM and NOx train emissions in the alameda corridor, California”, in Proceedings of the 88th annual meeting of the transportation research board, p. 19p. Available at: https://escholarship.org/uc/item/91v8j6hk. [ITS-Irvine record]
57. H. Liu, S. Jeng, A. Tok and S.G. Ritchie (2009) “Commercial vehicle classification using vehicle signature data”, in Proceedings of the 88th annual meeting of the transportation research board (DVD), washington D.C.. Available at: https://escholarship.org/uc/item/3bc653j7. [ITS-Irvine record]
58. Y. Tok and S.G. Ritchie (2009) “Better distinction of vehicle types through the correction of acceleration-distorted inductive signatures in arterial traffic”, in Proceedings 2nd international symposium on freeway and tollway operations, honolulu. [ITS-Irvine record]
59. Andre Tok, Shin-Ting Jeng, Hang Liu and Stephen G. Ritchie (2008) “Design and initial implementation of an inductive signature-based real-time traffic performance measurement system”, in 2008 11th international IEEE conference on intelligent transportation systems. IEEE / IEEE, pp. 216–221. Available at: 10.1109/itsc.2008.4732703. [ITS-Irvine record]
60. S. Park, S.G. Ritchie and Wen Cheng (2008) “Automated real-time vehicle classifier development based on vehicle signature”, in 2008 IEEE international conference on granular computing. IEEE, pp. 524–529. Available at: 10.1109/grc.2008.4664744. [ITS-Irvine record]
61. S. Jeng and S.G. Ritchie (2008) “Real-time vehicle classification using inductive loop signature data”, in Proceedings of the 86th annual meeting of the transportation research board, washington, DC. [ITS-Irvine record]
62. Yeow Chern Andre Tok, Stephen G. Ritchie and Shin-Ting Jeng (2007) “Understanding commercial vehicle travel through new high-fidelity inductive sensors”, in Proceedings of the 86th annual meeting of the transportation research board, p. 22p. [ITS-Irvine record]
63. Shin-Ting Jeng, Stephen G. Ritchie and Yeow Chern Tok (2007) “Freeway corridor performance measurement based on vehicle reidentification”, in Proceedings of the 86th annual meeting of the transportation research board, p. 23p. [ITS-Irvine record]
64. Shin-Ting Cindy Jeng and Stephen G Ritchie (2006) “New inductive signature data compression and transformation method for online vehicle reidentification”. Transportation Research Board 85th Annual Meeting. [ITS-Irvine record]
65. Shin-Ting (Cindy) Jeng and Stephen G. Ritchie (2006) “New inductive signature data compression and transformation method for online vehicle reidentification”, in Proceedings of the 85th annual meeting of the transportation research board, p. 26p. [ITS-Irvine record]
66. Cheol Oh and Stephen G. Ritchie (2005) “Development of methodology to design advanced traffic surveillance systems for traffic information based an origin-destination”, in Information systems and technology. TRANSPORTATION RESEARCH BOARD NATL RESEARCH COUNCIL, pp. 37–46. [ITS-Irvine record]
67. Seri Park, Shin-Ting Jeng, Choon Heon Yang and Stephen G. Ritchie (2005) “Simulated network evaluation based on vehicle reidentification”, in Proceedings of the 12th world congress on intelligent transport systems, san francisco, CA, p. 13p. [ITS-Irvine record]
68. Seri Park, Cheol Oh and Stephen G. Ritchie (2005) “Heterogeneous sensor data fusion for freeway traffic surveillance and performance”, in Proceedings of the 12th world congress on intelligent transport systems, san francisco, CA, p. 15p. [ITS-Irvine record]
69. Ravi P. Ramachandran, Glenn Arr, Carlos Sun and Stephen G. Ritchie (2002) “A pattern recognition and feature fusion formulation for vehicle reidentification in Intelligent Transportation Systems”, in IEEE international conference on acoustics speech and signal processing. IEEE / IEEE Signal Proc Soc (International conference on acoustics speech and signal processing (ICASSP)), pp. 3840–3843. Available at: 10.1109/icassp.2002.5745494. [ITS-Irvine record]
70. Cheol Oh, S.G. Ritchie, Jun-Seok Oh and R. Jayakrishnan (2002) “Real-time origin-destination (OD) estimation via anonymous vehicle tracking”, in Proceedings. The IEEE 5th international conference on intelligent transportation systems. IEEE, pp. 582–586. Available at: 10.1109/itsc.2002.1041283. [ITS-Irvine record]
71. C Sun and S Ritchie (2000) “Intelligent surveillance using inductive signatures”, in . Wang, PP (ed.) Proceedings of the fifth joint conference on information sciences, vols 1 and 2. ASSOC INTELLIGENT MACHINERY, pp. 722–725. [ITS-Irvine record]
72. C Sun and SG Ritchie (2000) “Heuristic vehicle classification using inductive signatures on freeways”, in Highway and traffic safety: Crash data, analysis tools, and statistical methods: Safety and human performance. TRANSPORTATION RESEARCH BOARD NATL RESEARCH COUNCIL / Transportat Res Board, pp. 130–136. [ITS-Irvine record]
73. Baher Abdulhai and Stephen G. Ritchie (1999) “Towards Adaptive Incident Detection Algorithms”. 6th ITS World Congress, Toronto. Available at: https://www.researchgate.net/publication/228968845_'Towards_adaptive_incident_detection_algorithms. [ITS-Irvine record]
74. Filippo Logi and Stephen G. Ritchie (1998) “Distributed approach to network-wide traffic control management”, in Proceedings of the international conference on applications of advanced technologies in transportation engineering, pp. 83–90. [ITS-Irvine record]
75. Reinhart D. Kuehne, Joe Palen, Craig Gardner and Stephen Ritchie (1998) “Loop-based travel time measurement”, in Proceedings of the international conference on applications of advanced technologies in transportation engineering, pp. 175–182. [ITS-Irvine record]
76. SM Kang, SG Ritchie and R Jayakrishnan (1998) “Prediction of short-term freeway traffic volume using recursive least squares and lattice filtering”, in . Hendrickson, CT and Ritchie, SG (ed.) Applications of advanced technologies in transportation. AMER SOC CIVIL ENGINEERS, pp. 255–264. [ITS-Irvine record]
77. S. G. Ritchie, Ruey L. Cheu and W. W. Recker (19982) “Freeway incident detection using artificial neural networks”, in Proceedings, International Conference on Artificial Intelligence Applications in Transportation Engineering. San Bueneventura, California. [ITS-Irvine record]
78. JB Sheu and SG Ritchie (1998) “Prototype of a new framework for real-time road traffic congestion detection”, in . Hendrickson, CT and Ritchie, SG (ed.) Applications of advanced technologies in transportation. AMER SOC CIVIL ENGINEERS, pp. 183–190. [ITS-Irvine record]
79. F Logi and SG Ritchie (1998) “A distributed approach to network-wide traffic control management”, in . Hendrickson, CT and Ritchie, SG (ed.) Applications of advanced technologies in transportation. AMER SOC CIVIL ENGINEERS, pp. 83–90. [ITS-Irvine record]
80. F Logi and SG Ritchie (1997) “A knowledge based system for integrated freeway and arterial incident management and control: Implementation and validation results”, in . Papageorgiou, M and Pouliezos, A (ed.) TRANSPORTATION SYSTEMS 1997, VOLS 1-3. PERGAMON PRESS LTD (Ifac symposia series), pp. 291–296. Available at: 10.1016/s1474-6670(17)43839-0. [ITS-Irvine record]
81. Stephen G. Ritchie, Filippo Logi, Seungmin Kang and Craig Rindt (1996) “Evaluation of a real-time expert system for surface street traffic management and control”, in Proceedings of the international conference on applications of advanced technologies in transportation engineering, pp. 276–280. [ITS-Irvine record]
82. Martin Molina, Filippo Logi, Stephen G. Ritchie and Jose Cuena (1996) “Architecture integrating symbolic and connectionist models for traffic management center decision support”, in Proceedings of the international conference on applications of advanced technologies in transportation engineering, pp. 320–324. [ITS-Irvine record]
83. B Abdulhai and SG Ritchie (1995) “Performance of artificial neural networks for incident detection in ITS”, in . Lall, BK and Jones, DL (ed.) TRANSPORTATION CONGRESS: CIVIL ENGINEERS - KEY TO THE WORLD'S INFRASTRUCTURE, PROCEEDINGS OF THE 1995 CONFERENCE, VOLS 1 AND 2. AMER SOC CIVIL ENGINEERS, pp. 227–238. [ITS-Irvine record]
84. C. Sun and S.G. Ritchie (1995) “Simulated field test of open architecture transportation controller software”, in Pacific rim TransTech conference. 1995 vehicle navigation and information systems conference proceedings. 6th international VNIS. A ride into the future. IEEE, pp. 414–419. Available at: 10.1109/vnis.1995.518870. [ITS-Irvine record]
85. Ms Kaseko, Sg Ritchie and Zp Lo (1993) “Evaluation of 2 automated thresholding techniques for pavement images”, in . Gilford, JL and Uzarski, DR and Mcneil, S (ed.) Infrastructure planning and management. AMER SOC CIVIL ENGINEERS, pp. 277–281. [ITS-Irvine record]
86. Sg Ritchie, Na Prosser and Bw Lamar (1993) “Combining symbolic and algorithmic methods for capital-budgeting in highway rehabilitation”, in . Gilford, JL and Uzarski, DR and Mcneil, S (ed.) Infrastructure planning and management. AMER SOC CIVIL ENGINEERS, pp. 315–319. [ITS-Irvine record]
87. D. Deeter and S. Ritchie (1993) “Prototype real-time expert system for surface street traffic management and control.”, in Conference on object-oriented programming systems, languages and applications, pp. 91–97. [ITS-Irvine record]
88. Ms Kaseko and Sg Ritchie (1991) “Pavement image-processing using neural networks”, in . Stephanedes, YJ and Sinha, KC (ed.) Applications of advanced technologies in transportation engineering. AMER SOC CIVIL ENGINEERS, pp. 238–242. [ITS-Irvine record]
89. R.L. Cheu, S.G. Ritchie, W.W. Recker and B. Bavarian (1991) “Investigation of a neural network model for freeway incident detection”, in . Topping, Bhv (ed.) Second International Conference on the Application of Artificial Intelligence to Civil & Structural Engineering. Civil-Comp Press, pp. 267–274. Available at: 10.4203/ccp.12.11.2. [ITS-Irvine record]
90. Stephen G. Ritchie, Manuan Kim and Neil A. Prosser (1990) “Pavement rehabilitation analysis and design mentor”, in Proceedings of the VTT symposium (valtion teknillinen tutkimuskeskus), pp. 353–381. [ITS-Irvine record]
91. Stephen G. Ritchie and Neil A. Prosser (1990) “Development of a prototype real-time expert system for managing non-recurring freeway congestion”, in Proceedings of the VTT symposium (valtion teknillinen tutkimuskeskus), pp. 129–153. [ITS-Irvine record]

Books and Book Chapters

1. Yiqiao Li, Andre Tok, Guoliang Feng and Stephen G. Ritchie (2023) “Understanding and Modeling the Impacts of COVID-19 on Freight Trucking Activity”, in A. Loukaitou-Sideris, A.M. Bayen, G. Circellaand R. Jayakrishnan (eds.) Pandemic in the Metropolis: Transportation Impacts and Recovery. Cham: Springer International Publishing (Springer Tracts on Transportation and Traffic), pp. 113–128. Available at: https://doi.org/10.1007/978-3-031-00148-2_8 (Accessed: October 5, 2023). [ITS-Irvine record]
2. Stephen Ritchie, Craig Rindt and Dean Deeter (2019) “Technological innovation and intelligent transportation systems for the US”, in US infrastructure. Routledge, pp. 37–54. Available at: https://doi.org/10.4324/9781351007023-3. [ITS-Irvine record]

Technical Reports

1. Stephen G. Ritchie, Andre Y.C. Tok, Tanjeeb Ahmed and Mingqi Yao (2024) Route-based Freight Activity Metrics along the California State Highway System through a Pilot Multi Sensor Fusion System. Final Report PSR-23-03 TO 073. PSR / ITS-Irvine. Available at: https://www.metrans.org/assets/research/route%20based%20freight%20activity%20metrics%20along%20the%20california%20state%20highway%20system%20through%20a%20pilot%20multi%20sensor%20fusion%20system.pdf. [ITS-Irvine record]
2. Craig Rindt, Mingqi Yao, Naila Sharmeen, Andre Tok, Stephen G. Ritchie, Blake Lane, Kate Forrest, Mike MacKinnon, Scott Samuelsen, Bo Liu, Kanok Boriboonsomsin, Abdullah Fuad Un-Noor, Suman Mitra, Farzana Mehzabin Tuli and Vuban Chowdhury (2023) Low-Carbon Transportation Incentive Strategies Using Performance Evaluation Tools for Heavy-Duty Trucks and Off-Road Equipment. Draft Final Report. California Air Resources Board / Institute of Transportation Studies, UC Irvine. Available at: https://ww2.arb.ca.gov/sites/default/files/2024-01/IV.3%20-%2019rd026-dfr-rsc_final_2023_12_20_clean.pdf. [ITS-Irvine record]
3. Stephen Ritchie, Andre Tok and Yiqiao Li (2023) Improved California Truck Traffic Census Reporting and Spatial Activity Measurement. Available at: http://escholarship.org/uc/item/0hg3x790. [ITS-Irvine record]
4. Stephen G. Ritchie, Andre Tok, Yiqiao Li, Zhe Sun and Koti Reddy Allu (2023) Investigation of LiDAR Sensing Technology to Improve Freeway Traffic Monitoring. Research Report. ITS-Irvine. Available at: https://metrans.org/assets/research/psr%2021-34_ritchie_final%20report.pdf. [ITS-Irvine record]
5. Craig Rindt, Youngeun Bae, Junhyeong Park, Mariana Sebastiani, Sina Dabagh, Stephen Ritchie and Suman Mitra (2022) Natural Gas Vehicle Incentive Program. Final Report CEC-600-14-006-24. California Energy Commision / Intitute of Transportation Studies, UC Irvine. Available at: https://www.energy.ca.gov/sites/default/files/2024-04/CEC-600-2024-024.pdf. [ITS-Irvine record]
6. Stephen G. Ritchie, Andre Tok, Yiqiao Li, Jared Sun and Koti R Allu (2021) Investigation of Truck Data Collection using LiDAR Sensing Technology Along Rural Highways. PSR-19-51. Available at: https://metrans.org/assets/research/uci-19-51-ritchie_final-report.pdf (Accessed: October 11, 2023). [ITS-Irvine record]
7. Austin L. Brown, Daniel Sperling, Bernadette Austin, J. R. DeShazo, Lew Fulton, Timothy Lipman, Colin W. Murphy, Jean Daniel Saphores, Gil Tal, Carolyn Abrams, Debapriya Chakraborty, Daniel Coffee, Sina Dabag, Adam Davis, Mark A. Delucchi, Kelly L. Fleming, Kate Forest, Juan Carlos Garcia Sanchez, Susan Handy, Michael Hyland, Alan Jenn, Seth Karten, Blake Lane, Michael Mackinnon, Elliot Martin, Marshall Miller, Monica Ramirez-Ibarra, Stephen Ritchie, Sara Schremmer, Joshua Segui, Susan Shaheen, Andre Tok, Aditya Voleti, Julie Witcover and Allison Yang (2021) Driving California’s Transportation Emissions to Zero. Available at: https://escholarship.org/uc/item/3np3p2t0 (Accessed: October 11, 2023). [ITS-Irvine record]
8. Kyungsoo Jeong and Stephen G Ritchie (2018) Routing and scheduling problem of container trucks with selective empty container pickup in a shared resource environment. [ITS-Irvine record]
9. Jaeyoung Jung, Andre Tok and Stephen G Ritchie (2018) Determining optimal sensor locations under uncertainty for advanced truck surveillance on California freeways. [ITS-Irvine record]
10. Stephen G. Ritchie, Kyung Hyun and Andre Tok (2017) New Methods for Monitoring Spatial Truck Travel Patterns in California Using Exisiting Dectector Infrastructure. Research Report UC-ITS-2017-36. UC ITS / ITS-Irvine. Available at: https://doi.org/10.7922/g29p2zvj. [ITS-Irvine record]
11. Stephen G. Ritchie, Doug Houston and Michelle E. Zuñiga (2017) Policy and Literature Review on the Effect Millennials Have on Vehicle Miles Traveled, Greenhouse Gas Emissions, and the Built Environment. Available at: https://escholarship.org/uc/item/8dc5g9d8 (Accessed: October 11, 2023). [ITS-Irvine record]
12. Stephen G. Ritchie and Andre Tok (2016) Development of a New Methodology to Characterize Truck Body Types along California Freeways. Research Report. ITS-Irvine. Available at: https://ww2.arb.ca.gov/sites/default/files/classic/research/apr/past/11-316.pdf. [ITS-Irvine record]
13. Jinheoun Choi, Stephen G Ritchie and Cheol Oh (2015) Real-time estimation of freeway emissions based on an inductive-loop-based surveillance system. [ITS-Irvine record]
14. Zhe Sun, Wen-Long Jin and Stephen G Ritchie (2015) Simultaneous state and parameter estimation in newell's simplified kinematic wave model with heterogeneous data. [ITS-Irvine record]
15. Wei-bin Zhang, Jihua Huang, Andre Tok, Ching-Yao Chang and Stephen Ritchie (2014) The Requirements and Recommendations for Development of a California Weigh-in-Motion Test Facility. University of California, Berkeley / California Partners for Advanced Transit and Highways, p. 130p. [ITS-Irvine record]
16. Andre Tok and Stephen G Ritchie (2014) Integration of weigh-in-motion and inductive signature technology for advanced truck monitoring. [ITS-Irvine record]
17. Pedro V Camargo, Michael G McNally and Stephen G Ritchie (2014) Exploratory use of raster images as a data source for agricultural commodity transportation modeling. [ITS-Irvine record]
18. Jaeyoung Jung, Andre Tok, Stephen G. Ritchie and Irvine University of California (2013) Optimal sensor locations for advanced truck surveillance on California freeways, p. 21p. [ITS-Irvine record]
19. Jinheoun Choi, Stephen G Ritchie and Cheol Oh (2013) Methodology for generating individual vehicle speed profile for estimating freeway emissions. [ITS-Irvine record]
20. Stephen G. Ritchie, Andre Tok, Shin-Ting Jeng, Hang Liu, Sarah V. Hernandez and Jin Heoun Choi (2010) Online Freeway Corridor Deployment of Anonymous Vehicle Tracking for Real Time Traffic Performance. Research Report CA11-1226, UCI-0279. ITS-Irvine. Available at: https://dot.ca.gov/-/media/dot-media/programs/research-innovation-system-information/documents/f0017265-final-report-task-0686.pdf. [ITS-Irvine record]
21. Gunwoo Lee, Soyoung (Iris) You, Mana Sangkapichai, Stephen G. Ritchie, Jean-Daniel M Saphores, Oladele Ogunseitan, Roberto Ayala, R. Jayakrishnan and Rodolfo Torres (2010) Assessing the Environmental and Health Impacts of Port-Related Freight Movement in a Major Urban Transportation Corridor. Final Report UCTC-FR-2010-08. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/9zb040jb. [ITS-Irvine record]
22. Stephen G. Ritchie, Shin-Ting Jeng, Andre Tok, Dmitri Arkhipov, Pedro Veiga De Camargo, Rex Chen, Joseph Y.J. Chow, Jae Young Jung, Fatemeh Ranaiefar and Miyuan Zhao (2010) Assessment and Development of Commodity Flow, Logistics, and Other Relevant Goods Movement Data Sources to Facilitate Statewide Freight Modeling. Research Report. ITS-Irvine. [ITS-Irvine record]
23. Stephen G. Ritchie, Shin-Ting (Cindy) Jeng, Yeow Chern (Andre) Tok and Seri Park (2008) Corridor Deployment and Investigation of Anonymous Vehicle Tracking for Real-Time Traffic Performance Measurement. Final Report UCB-ITS-PRR-2008-23. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/7hx5k9vt. [ITS-Irvine record]
24. Stephen G. Ritchie, Seri Park, Cheol Oh, Shin-Ting (Cindy) Jeng and Andre Tok (2005) Anonymous Vehicle Tracking for Real-Time Freeway and Arterial Street Performance Measurement. Final Report UCB-ITS-PRR-2005-9. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/50c6z6zh. [ITS-Irvine record]
25. Steven Ritchie, Seri Park, Cheol Oh, Shin-Ting Jeng and Andre Tok (2005) Field Investigation of Advanced Vehicle Reidentification Techniques and Detector Technologies - Phase 2. Final Report UCB-ITS-PRR-2005-8. Institute of Transportation Studies, Irvine, p. 72p. Available at: https://escholarship.org/uc/item/3jq8609j. [ITS-Irvine record]
26. Stephen G. Ritchie, Seri Park, Cheol Oh and Carlos Sun (2002) Field Investigation of Advanced Vehicle Reidentification Techniques and Detector Technologies - Phase 1. Final Report UCB-ITS-PRR-2002-15. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/1fj5d7c4. [ITS-Irvine record]
27. Stephen G. Ritchie, Carlos Sun, Seri Oh and Cheol Oh (2001) Section-Related Measures of Traffic System Performance: Prototype Field Implementation. Final Report UCB-ITS-PRR-2001-32. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/0f89s74m. [ITS-Irvine record]
28. Baher Abdulhai, Stephen G. Ritchie and Mahadevan Iyer (1999) Implementation of Advanced Techniques for Automated Freeway Incident Detection. Final Report UCB-ITS-PRR-99-42. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/3r3366br. [ITS-Irvine record]
29. Stephen Ritchie and Carlos Sun (1998) Section Related Measures of Traffic System Performance: Final Report. Final Report UCB-ITS-PRR-98-33. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/4sc0t3bv. [ITS-Irvine record]
30. Stephen G. Ritchie and Baher Abdulhai (1997) Development Testing And Evaluation Of Advanced Techniques For Freeway Incident Detection. Final Report UCB-ITS-PWP-97-22. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/5720z2mw. [ITS-Irvine record]
31. Stephen G. Ritchie and Ruey L. Cheu (1993) Neural Network Models For Automated Detection Of Non-recurring Congestion. Final Report UCB-ITS-PRR-93-5. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/6r89f2hw. [ITS-Irvine record]
32. Stephen G Ritchie, D M Rizzo and Jeffrey L. Adler (1990) EXPERT SYSTEM DEVELOPMENT FOR HAZARDOUS WASTE MANAGEMENT. FINAL REPORT. Final Report. Institute of Transportation Studies, Irvine. Available at: https://trid.trb.org/view/344406. [ITS-Irvine record]
33. Stephen G. Ritchie and C. Yeh (1987) Knowledge-based approach to improve urban transportation decision-making. Institute of Transportation Studies, Irvine, pp. 343–354. [ITS-Irvine record]

Policy Briefs

1. Stephen Ritchie, Youngeun Bae and Craig Rindt (2025) Navigating the Shift: Critical Insights of California Fleet Operators into Zero-Emission Technologies. Policy Brief. UC ITS. Available at: https://doi.org/10.7922/g2pg1q3r. [ITS-Irvine record]
2. Youngeun Bae, Craig Rindt and Stephen Ritchie (2025) What Matters Most to Drayage Companies When Considering a Zero-Emission Truck: Insights from Small and Large Fleet Operators. Policy Brief. UC ITS. Available at: https://doi.org/10.7922/g2dz06np. [ITS-Irvine record]
3. Andre Tok, Stephen Ritchie and Craig Rindt (2019) New Tool from UC Irvine Could Save the State Millions while Providing Better Data on Truck Activity in California. Policy Brief. UC ITS. Available at: https://doi.org/10.7922/g21834r1. [ITS-Irvine record]
4. Andre Tok, Stephen G. Ritchie and Craig Rindt (2019) New Tool from UC Irvine Could Save the State Millions while Providing Better Data on Truck Activity in California. Policy Brief. Available at: https://escholarship.org/uc/item/12w5z2c8 (Accessed: October 11, 2023). [ITS-Irvine record]
5. Gunwoo Lee, Soyoung Iris You, Mana Sangkapichai, Stephen G Ritchie, Jean-Daniel Saphores, Oladele Ogunseitan, Roberto Ayala, R Jayakrishnan and Rodolfo Torres (2010) Health impacts of moving freight in and out of the ports of long beach and Los Angeles. Policy Brief UCTC POLICY BRIEF 2010-04. University of California Transportation Center. Available at: https://escholarship.org/uc/item/2fb6k6s6. [ITS-Irvine record]

Working Papers

1. Sarah Hernandez, Andre Tok and Stephen G. Ritchie (2022) Integration of Weigh-in-Motion and Inductive Signature Technology for Advanced Truck Monitoring. Working Paper UCI-ITS-WP-13-3. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/3tt6050j. [ITS-Irvine record]
2. Yiqiao Li, Andre Tok, Zhe Sun, Stephen G. Ritchie and Koti Reddy Allu (2021) Vehicle Point Cloud Reconstruction Framework for FHWA axle-based Classification using Roadside LiDAR Sensor. Working Paper. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/2jf86859. [ITS-Irvine record]
3. Neda Masoud, Fatemeh Ranaiefar, Michael McNally, Daniel Rodriguez-Roman and Stephen G. Ritchie (2013) An Alternative Method to Estimate Balancing Factors for the Disaggregation of OD Matrices. Working Paper UCI-ITS-WP-13-5. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/8gf82013. [ITS-Irvine record]
4. Sarah Hernandez, Andre Tok and Stephen G. Ritchie (2013) Density Estimation using Inductive Loop Signature based Vehicle Re-identification and Classification. Working Paper UCI-ITS-WP-13-4. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/3x50n93f. [ITS-Irvine record]
5. Fatemeh Ranaiefar, Joseph Y.J. Chow, Daniel Rodriguez-Roman, Pedro V. Camargo and Stephen G. Ritchie (2012) Geographic Scalability and Supply Chain Elasticity of a Structural Commodity Generation Model Using Public Data. Working Paper UCI-ITS-WP-12-4. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/6hz8v1wx. [ITS-Irvine record]
6. Gunwoo Lee, Soyoung Iris You, Stephen G. Ritchie, Jean-Daniel Saphores, Mana Sangkapichai and R. Jayakrishnan (2008) Environmental Impacts of a Major Freight Corridor: A study of the I-710 in California. Working Paper UCI-ITS-WP-08-3. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/20b7q5fn. [ITS-Irvine record]
7. Mana Sangkapichai, Jean-Daniel Saphores, Stephen G. Ritchie, Soyoung (Iris) You and Gunwoo Lee (2008) An Analysis of PM and NOx Train Emissions in the Alameda Corridor, CA.. Working Paper UCI-ITS-WP-08-4. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/00n2h30c. [ITS-Irvine record]
8. Cheol Oh and Stephen G Ritchie (2003) Vehicle re-identification using heterogeneous detection systems. Working Paper UCI-ITS-TS-WP-03-9. ITS-Irvine. Available at: https://www.researchgate.net/publication/244446834_Vehicle_re-identification_using_heterogeneous_detection_systems. [ITS-Irvine record]
9. Filippo Logi, Craig R Rindt, Michael G McNally and Stephen G Ritchie (2000) TRICEPS/CARTESIUS: An ATMS testbed implementation for the evaluation of inter-jurisdictional traffic management strategies. Working Paper. Institute of Transportation Studies, Irvine. Available at: https://www.researchgate.net/publication/2485595_Triceps_Cartesius_An_Atms_Testbed_Implementation_For_The_Evaluation_Of_Inter-Jurisdictional_Traffic_Management_Strategies. [ITS-Irvine record]
10. Carlos Sun and Stephen G. Ritchie (1999) Individual Vehicle Speed Estimation Using Single Loop Inductive Waveforms. Working Paper UCB-ITS-PWP-99-14. ITS-Irvine. Available at: https://escholarship.org/uc/item/2zz4b12p. [ITS-Irvine record]
11. Stephen G. Ritchie and Neil Prosser (1992) A Real-Time Expert System Approach To Freeway Incident Management. Working Paper Working Paper 88. ITS-Irvine. Available at: https://escholarship.org/uc/item/432020jq. [ITS-Irvine record]
12. Neil Prosser and Stephen G. Ritchie (1992) Real-Time Knowledge-Based Integration Of Freeway Surveillance Data. Working Paper Working Paper 89. ITS-Irvine. Available at: https://escholarship.org/uc/item/3j5655n7. [ITS-Irvine record]
13. Stephen G. Ritchie (1990) A Knowledge-Based Decision Support Architecture for Advanced Traffic Management. Working Paper Reprint No. 31. ITS-Irvine. Available at: https://escholarship.org/uc/item/7qv4w8kj. [ITS-Irvine record]
14. Stephen G. Ritchie and C. Yeh (1987) A Knowledge-Based Approach to Improve Urban Transportation Decision Making. Working Paper UCI-ITS-WP-87-9. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/4dg131zw. [ITS-Irvine record]
15. Stephen G. Ritchie (1986) A Statistical Approach to Statewide Traffic Counting. Working Paper UCI-ITS-WP-86-5. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/6843w8m2. [ITS-Irvine record]
16. Stephen G. Ritchie and Mark E. Hallenbeck (1986) Evaluation of a Statewide Highway Data Collection Program. Working Paper UCI-ITS-WP-86-4. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/5f75080n. [ITS-Irvine record]

Presentations

1. Koti Reddy Allu, Montana Reinoehl, Siwei Hu, Andre Tok, Wenlong Jin, Jared Sun and Stephen G. Ritchie (2022) “Investigation to Develop Impaired Driving Detection System Using Lidar”. NSF AI Workshop, Gainesville, Florida, 15 December. [ITS-Irvine record]

Preprints

1. Youngeun Bae, Craig Rindt, Stephen Ritchie (2025) An Exploratory Analysis. Available at: https://escholarship.org/uc/item/5cf1w75g. [ITS-Irvine record]
2. Youngeun Bae, Craig Rindt, Stephen Ritchie (2025) Small and Large Fleet Perceptions on Zero-emission Trucks and Policies. Available at: https://escholarship.org/uc/item/3xq588x4. [ITS-Irvine record]
3. Craig Rindt, Stephen Ritchie, Youngeun Bae (2025) A Choice Experiment Survey of Drayage Fleet Operator Preferences for Zero-Emission Trucks. Available at: https://escholarship.org/uc/item/2sf928j3. [ITS-Irvine record]
4. Youngeun Bae, Craig R. Rindt, Suman Mitra and Stephen G. Ritchie (2022) “Fleet Operator Perspectives on Alternative Fuels for Heavy-Duty Vehicles”. Rochester, NY. Available at: https://papers.ssrn.com/abstract=4253440 (Accessed: October 5, 2023). [ITS-Irvine record]