conference paper

Small and Large Fleet Perceptions on Zero-Emission Trucks and Policies

Proceedings, 104th Annual Meeting of the Transportation Research Board

Abstract

Given that small fleets (defined as those with 20 or fewer vehicles) represent a considerable portion of the heavy-duty vehicle (HDV) sector, understanding their perspectives, along with those of large fleets, on zero-emission vehicles (ZEVs) and related policies is crucial for achieving the U.S. HDV sector’s ZEV transition goals. However, research focusing on small fleets or comparing both segments has been limited. Focusing on California’s drayage sector with stringent ZEV transition targets, this study investigates the awareness and perceptions of small and large fleet operators on ZEV technologies and policies established to promote ZEV adoption. Using a fleet survey, we obtained 71 responses from both small and large fleets. We employed a comprehensive exploratory approach, utilizing descriptive analysis, hypothesis testing, and thematic analysis. Findings reveal that both segments generally rated their ZEV knowledge as close to neutral, with about a third reporting limited awareness of the ZEV policy. Both segments highlighted various adoption barriers, including challenges with infrastructure, costs, and operational compatibility. Business strategies under the ZEV policy differed significantly: small fleets planned to delay or avoid ZEV procurement, with some considering relocation, while large fleets were more proactive, with many already having procured or preparing to procure ZEVs. Both segments voiced concerns about the disproportionate impact on small fleets. The findings enhance our understanding of equity issues in ZEV adoption across fleet segments and offer valuable insights for policymakers committed to a more equitable distribution of the impacts.

Suggested Citation
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..

working paper

Impacts Of The San Diego Photo Red Light Enforcement System On Traffic Safety

Publication Date

November 1, 2002

Author(s)

Jacqueline Golob, Thomas Golob

Abstract

The paper reports on the analysis of violation and crash data as part of an evaluation of the impact on traffic safety of the San Diego Photo Red Light Enforcement System. The system was found to have resulted in a statistically significant reduction in the number of red light running violations. The decreases in violations occurred at almost all camera enforced intersections and the decreases continued, at a diminishing rate, throughout the period the cameras were operated. The impact on traffic safety was more complex. For traffic traveling in the enforced direction at intersections with red light cameras, crashes attributable to red light running decreased after implementation to approximately 60 percent of pre-enforcement rates, while rear end crashes increased to approximately 140 percent of pre-implementation levels. These before-and-after changes in crash rates were statistically significant, while there were no significant changes in crash rates for traffic traveling in directions not covered by the red light cameras. In addition, it is concluded that photo enforcement was more effective in reducing crashes at intersections where through movement was enforced, than where left turns were enforced.

published journal article

Demand for clean-fuel vehicles in California: A discrete-choice stated preference pilot project

Transportation Research Part A: Policy and Practice

Publication Date

May 1, 1993

Author(s)

David Bunch, Mark Bradley, Thomas Golob, Ryuichi Kitamura, Gareth P. Occhiuzzo

Abstract

A study was conducted to determine how demand for clean-fuel vehicles and their fuels is likely to vary as a function of attributes that distinguish these vehicles from conventional gasoline vehicles. For the purposes of the study, clean-fuel vehicles are defined to encompass both electric vehicles and unspecified (methanol, ethanol, compressed natural gas or propane) liquid and gaseous fuel vehicles, in both dedicated or multiple-fuel versions. The attributes include vehicle purchase price, fuel operating cost, vehicle range between refueling, availability of fuel, dedicated versus multiple-fuel capability and the level of reduction in emissions (compared to current vehicles). In a mail-back stated preference survey, approximately 700 respondents in the California South Coast Air Basin gave their choices among sets of hypothetical future vehicles, as well as their choices between alternative fuel versus gasoline for hypothetical multiple-fuel vehicles. Estimates of attribute importance and segment differences are made using discrete-choice nested multinomial logit models for vehicle choice and binomial logit models for fuel choice. These estimates can be used to modify present vehicle-type choice and utilization models to accommodate clean-fuel vehicles; they can also be used to evaluate scenarios for alternative clean-fuel vehicle and fuel supply configurations. Results indicate that range between refueling is an important attribute, particularly if range for an alternative fuel is substantially less than that for gasoline. For fuel choice, the most important attributes are range and fuel cost, but the predicted probability of choosing alternative fuel is also affected by emissions levels, which can compensate for differences in fuel prices.

Suggested Citation
David S. Bunch, Mark Bradley, Thomas F. Golob, Ryuichi Kitamura and Gareth P. Occhiuzzo (1993) “Demand for clean-fuel vehicles in California: A discrete-choice stated preference pilot project”, Transportation Research Part A: Policy and Practice, 27(3), pp. 237–253. Available at: 10.1016/0965-8564(93)90062-p.

working paper

Electronic Integration in the Air Cargo Industry: An Information Processing Model of On-Time Performance

Publication Date

January 1, 2003

Author(s)

Abstract

This study examines electronic integration in logistics supply chains using the non-integrated US-international air cargo industry as a case study. We ask what impact electronic integration has on interorganizational task performance, and hypothesize about factors limiting the effectiveness of electronic integration. Surprisingly, our study does not find evidence of direct impacts of electronic integration on performance though it does find evidence of indirect impacts of information systems use and performance. The findings suggest that the use of electronic integration as a strategy to improve operational performance across firms is limited by the nature of the interorganizational task, environmental dynamism, and the power relationship between firms in the supply chain.

research report

Impacts of LA Metro’s K-14 Fareless Transit Initiative on Youth Travel Behavior

Abstract

In October 2021, the Los Angeles Count Metropolitan Transportation Authority (LA Metro), in collaboration with other regional transit operators and multiple school districts across the county, launched the GoPass pilot program to offer free transit passes to K-14 students, which became permanent in early 2024. Students in a high school district in the Greater Los Angeles area were surveyed to determine the reasons students decided to participate in GoPass and how the students subjectively valued their travel preference. Students were less likely to participate in the GoPass program if they had the use of a car for trips to school but more likely if they had the option to take transit for trips leaving school. Student demographics did not play a large role in whether they participated in GoPass. Students highly value cars and trip amenities, such as onboard Wi-Fi. They subjectively value reduced travel time at $71/hour, similar to other studies among adults, but valued reduced waiting time at $98/hour, again consistent with other studies that find a high relative value for shorter waiting time. Students are not likely to be persuaded to take transit merely by making it free. Instead, school districts may consider increasing the cost for campus parking permits and reducing the number of campus parking spaces to encourage greater use of transit and shared travel modes.

published journal article

Goal programming approach to allocate freight analysis framework mode flow data

Transportation Research Record

Suggested Citation
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.

published journal article

Combinatorial auctions for transportation service procurement: The carrier perspective

Transportation Research Record

Publication Date

January 1, 2003
Suggested Citation
Jiongjiong Song and Amelia Regan (2003) “Combinatorial auctions for transportation service procurement: The carrier perspective”, Transportation Research Record, 1833(1), pp. 40–46. Available at: 10.3141/1833-06.

working paper

Economic and Occupational Causes of Transit Operator Absenteeism: A Review of Research

Publication Date

March 1, 1984

Author(s)

Working Paper

UCI-ITS-WP-84-3

Areas of Expertise

Abstract

Transit operator absence from work is a costly and pervasive problem within public transport organizations. This paper reviews over forty international studies in order to document significant factors related to this phenomenon. We begin with a brief assessment of the magnitude and costs of operator absence and isolate two major theories which have been proposed to explain operator absence behavior: the income-leisure tradeoff and occupational stress. Case study reports from three U.S. public transport organizations are used to illustrate the range of factors which influence employee absence behavior. We conclude with suggestions for organizational changes which may serve to reduce operator absence and suggestions for further research.

Suggested Citation
Lyn Long and James L. Perry (1984) Economic and Occupational Causes of Transit Operator Absenteeism: A Review of Research. Working Paper UCI-ITS-WP-84-3. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/46s54575.

published journal article

Stochastic preplanned household activity pattern problem with uncertain activity participation (SHAPP)

Transportation Science

Publication Date

August 1, 2013
Suggested Citation
Li Ping Gan and Will Recker (2013) “Stochastic preplanned household activity pattern problem with uncertain activity participation (SHAPP)”, Transportation Science, 47(3), pp. 439–454. Available at: 10.1287/trsc.1120.0426.

Phd Dissertation

Diffusion and Management of Disruptive Technology in Cities: The Case of Drones

Abstract

While the industry of civilian unmanned aerial vehicles (UAV) or drones has seen rapid expansion in the past decade, few studies have systematically examined the dynamics between this disruptive technology and various aspects of cities. Employing quantitative methods, this dissertation explores 1) the diffusion and adoption patterns of civilian drones; 2) how cities manage the challenges of increasing drone activities; and 3) the supply-side opportunities and constraints associated with the deployment of Urban Air Mobility (UAM) in built-out metropolitan areas. The results of the first county level study might suggest (Chapter 2) that the digital divide has magnified the uneven and nonlinear diffusion of drones across time and space. Furthermore, the strength of state-level interventions correlates with the intensity of local drone adoption, even though the regulatory effects are different among drone user groups. People living in neighborhoods with a higher adoption rate of drones are on average younger, more affluent, and Whiter. An extension of the first study at the zip code level (Chapter 3) has retested the key results and provided additional insights into the spatial dependence effects that affect the drone adoption patterns. Furthermore, the results of the second study (Chapter 4) indicate that local drone policy adoption among communities of color trails behind that of other communities. Although drone policy adoption at the local level has been shaped by both motivation and capacity factors, the desire to protect public facilities appears to motivate localities to adopt regulatory measures. In particular, policy adoption is influenced by what nearby cities do, suggesting that strategic interaction is at play among local governments. In the third study (Chapter 5), I evaluate the supply-side opportunities and constraints associated with UAM adoption through a systematic scenario analysis. The results of the third study indicate that current supply-side infrastructure opportunities in Southern California, like helipads and elevated parking structures, are widely available to accommodate the regional deployment of UAM service although current spatial constraints can significantly limit the location choice of UAM landing sites (vertiports) for electric vertical take-off and landing (eVTOL) aircraft. Moreover, the low-income and young populations tend to live relatively farther away from the supply-side opportunities compared to the general population. The third study also proposes a network of UAM stations in Southern California based on the joint considerations of available infrastructure and home-workplace commuting flows.

Suggested Citation
XIANGYU LI (2022) Diffusion and Management of Disruptive Technology in Cities: The Case of Drones. PhD Dissertation. UC Irvine. Available at: https://escholarship.org/uc/item/20t4w3kj#main.