Conference Paper: Method for creating a real-time distributed travel history database – Persistent traffic cookies project

Abstract

A novel distributed method for estimating a trip table in real time is described. The system is called “persistent traffic cookies” by analogy with the use of cookies by web servers to keep track of the current state of web browsers navigating a web site. The method uses traffic cookies placed on in-vehicle computers to maintain the state (current trip) of vehicles moving through the system. These cookies are persistent from day to day; taken together, they form a complete travel history for a traveler or vehicle. The method leverages the vehicles to store their own travel data and then physically do carry those data around the network. Advantages include scalability in both storage and computational effort as well as the unique ability to incorporate the travel behavior of individuals into real-time traffic predictions. A small-scale simulation is presented to illustrate the concept and its potential applications.

published journal article

Evaluation of a statewide highway data collection program.

Transportation Research Record

Publication Date

January 1, 1986

Author(s)

Stephen Ritchie, Mark E. Hallenbeck

Abstract

This paper ls a discussion of an in-depth evaluation study of highway data development and analysis activities of the Washington State Department of Transportation. Statistically based procedures and recommendations that were developed to streamline the highway data collection program are described. Opportunities to reduce manpower and equipment costs, streamline work activities, Improve the quality of data collected, and provide accurate and timely data for the various users were Identified. Given the focus on highway data, a major effort was devoted to the department’s traffic-counting program. However, many data items and programs were considered, and the following items received particular attention: traffic volume counting, including estimation of annual average dally traffic at any location tbroughout the state highway system; associated seasonal, axle, and growth factors; vehicle classification; trqck weight; and the relationships between the statistical sampling requirements recommended for these items and those associated with the FHWA Highway Performance Monitoring System (HPMS) in the state. Employing statistical sampling methods that complement the HPMS sample offers a strong potential for significantly Improving the cost-effectiveness of a statewide highway data collection program.

Suggested Citation
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.

working paper

The Built Environment as a Determinant of Walking Behavior: Analyzing Non-Work Pedestrian Travel in Portland, Oregon

Publication Date

July 1, 2001

Working Paper

UCI-ITS-WP-01-9, UCI-ITS-AS-WP-01-4

Areas of Expertise

Abstract

Much has been written about the connection between land use/urban form and transportation from the perspective of impacting automobile trip generation. This only addresses half the issue. The theoretical advances in land use/transportation relationships embodied in paradigms such as the jobs housing balance, neo-traditional design (NTD) standards and transit oriented development (TOD) rely very heavily on the generation of pedestrian traffic in order to realize their proposed benefits. The analysis presented here employs similar models and data sets used in Boarnet & Greenwald for the Portland, Oregon area, but applies them towards analysis of non-work walking travel. The results suggest that whatever effects land use has on affecting individual non-work walking trip generation, the impacts take place at the neighborhood level.

Suggested Citation
Michael J. Greenwald and Marlon G. Boarnet (2001) The Built Environment as a Determinant of Walking Behavior: Analyzing Non-Work Pedestrian Travel in Portland, Oregon. Working Paper UCI-ITS-WP-01-9, UCI-ITS-AS-WP-01-4. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/9gn7265f.

published journal article

City spending on economic development versus affordable housing: Does inter-city competition or local politics drive decisions?

Journal of Urban Affairs

Publication Date

September 1, 2000

Author(s)

Suggested Citation
Victoria Basolo (2000) “City spending on economic development versus affordable housing: Does inter-city competition or local politics drive decisions?”, Journal of Urban Affairs, 22(3), pp. 317–332. Available at: 10.1111/0735-2166.00059.

working paper

The Effect of Organization Size and Structure on Transit Performance and Employee Satisfaction: A Literature Review

Abstract

The following secti-on reviews the development of structure as an organizational variable, discusses the various dimensions of organizational structure in detail, and discusses their application to the transit industry.

Suggested Citation
Dan R. Dalton, Gordon J. Fielding, Lyman W. Porter, Michael J. Spendolini and William D. Todor (1978) The Effect of Organization Size and Structure on Transit Performance and Employee Satisfaction: A Literature Review. Working Paper UCI-ITS-WP-78-8. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/826211pv.

published journal article

Flight Procedural Noise Assessment of Blended-Wing–Body Aircraft with Variable Thrust

Journal of Aircraft

Publication Date

February 6, 2025

Author(s)

Victoria Pellerito, Mallory Mott, Naomi Acosta, Jacqueline (Jacquie) Huynh, Jack Ahrens, Franco Staub, Judy Gallman, John Vassberg

Abstract

Today’s commercial aviation industry centers on the tube-and-wing aircraft configuration with underwing-mounted engines, possibly nearing convergence on optimal performance capabilities with acceptable community noise. A potentially feasible breakthrough for obtaining lower noise levels for commercial aviation is the blended-wing–body (BWB), which presents unique noise-reducing characteristics such as engine shielding and simplified high-lift devices. The significance of characteristics unique to BWBs on overall aircraft noise is assessed through a study of a BWB aircraft design representative of the JetZero vehicle. This paper presents a methodology capable of modeling the aircraft’s propulsion system and corresponding performance capabilities necessary to assess the vehicle noise sources and overall community noise impact. Analysis of Part 36 certification noise levels indicates that the vehicle’s margin to Stage 5 standards is 35.8 effective perceived noise level (in EPNdB), and an additional 2.0 EPNdB is achievable with a decreased maximum takeoff thrust engine variant. Community noise impacts of departure and arrival procedures are studied through comparison of single-event noise contours. Significant contour area reductions were observed when compared to conventional tube-and-wing aircraft of similar weight and range class. Further departure and approach noise reductions were modeled through additional full-flight procedure variations.

Suggested Citation
Victoria Pellerito, Mallory Mott, Naomi Acosta, Jacqueline Huynh, Jack Ahrens, Franco Staub, Judy Gallman and John Vassberg (2025) “Flight Procedural Noise Assessment of Blended-Wing–Body Aircraft with Variable Thrust”, Journal of Aircraft, pp. 1–12. Available at: 10.2514/1.C037984.

Conference Paper: Performance of artificial neural networks for incident detection in ITS

conference paper

A distributed approach to network-wide traffic control management

Applications of advanced technologies in transportation

Publication Date

January 1, 1998

Abstract

This paper presents a distributed architecture for area-wide incident response and traffic control management, composed of two interacting, real-time decision-support systems that are able to perform cooperative reasoning and to resolve conflicts. The two units exchange partial and potentially incomplete results during the execution of their problem-solving tasks and exploit inter-agent constraints to resolve inconsistencies that are due to the limitations of their information, in order to integrate local solutions into global, network-wide control plans. Reflecting the complexity of the interaction between the various agencies engaged in the management and control of urban networks, this approach takes into account the desire of each individual agency to preserve its autonomy and maintain the control of the facilities under its jurisdiction, but at the same time tries to exploit their willingness to cooperate and unify their problem-solving capabilities towards a conflict-free, integrated response to operational problems.

Suggested Citation
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.

published journal article

I hear, therefore I know where I am: Compensating for GNSS limitations with cellular signals

IEEE Signal Processing Magazine

Publication Date

September 1, 2017

Author(s)

Zaher Kassas, Joe Khalife, Kimia Shamaei, Joshua Morales
Suggested Citation
Zaher Zak M. Kassas, Joe Khalife, Kimia Shamaei and Joshua Morales (2017) “I hear, therefore I know where I am: Compensating for GNSS limitations with cellular signals”, IEEE Signal Processing Magazine, 34(5), pp. 111–124. Available at: 10.1109/msp.2017.2715363.

research report

Between the Forest and the Trees: Community Strategies to Transform Roadways in California’s San Joaquin Valley

Abstract

Expanding participation of historically disenfranchised groups within decision-making processes is an important strategy to increase equity within transportation planning but traditional engagement practices (e.g., public meetings, focus groups) have historically done little to address the needs of disadvantaged communities. This study evaluates the opportunities and barriers to using a community steering committee participation model within transportation planning to advance equity and environmental justice. It utilizes interview and case study analysis to examine the experiences of residents and community leaders in prioritizing community-identified strategies to mitigate roadway hazards in three AB 617 communities in California’s San Joaquin Valley – Stockton, South Central Fresno, and Arvin/Lamont. It investigates the role resident and CBO members played in the prioritization, approval, and implementation of three strategies to transform roadways and mitigate air pollution, noise, dust, and safety hazards: (1) new vegetative barriers between major roadways and sensitive land uses; (2) expanded sidewalk infrastructure; and (3) revised heavy-duty truck route designations. Findings demonstrate that “meaningful involvement” for impacted communities within transportation planning will require officials, residents, and organizations to commit to an ongoing process of experimentation and learning about the most effective approaches for advancing transportation equity and environmental justice.

Suggested Citation
Douglas Houston, Gregg Macey, Jeannine Pearce and Catherine Garoupa White (2025) Between the Forest and the Trees: Community Strategies to Transform Roadways in California’s San Joaquin Valley. Research Report 2023-38. UC ITS. Available at: https://doi.org/10.7922/g25t3hvp.