published journal article

Real-Time Decision-Support system for freeway management and control

Journal of Computing in Civil Engineering

Publication Date

January 1, 1994
Suggested Citation
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).

published journal article

A Utility Model for Travel Forecasting

Transportation Science

Publication Date

February 1, 1971

Author(s)

Thomas Golob, Martin J. Beckmann

Abstract

This paper shows how the problem of predicting traveler behavior may be approached in terms of economic utility theory. A general utility maximization model on the level of individual trip-making decisions is developed from basic hypotheses regarding the costs and benefits attributed to travel disaggregated into individual trips. For predictive purposes the form of the utility functions involved must be specified, and several possibilities are explored. The functional forms of the resulting travel demand functions are then derived. In order to pursue an analysis of variations in traveler behavior and in order to perform aggregation over individuals, disturbances in the parameters of the utility functions are considered. The parameters investigated are marginal utilities and the distributions used are normal distributions. In considering binary choices, a trip demand model, a modal split model, and a destination split model are obtained from the same basic methodology. Finally, possible approaches to testing the functional relations involved and to measuring marginal utilities are discussed.

Suggested Citation
Thomas F. Golob and Martin J. Beckmann (1971) “A Utility Model for Travel Forecasting”, Transportation Science, 5(1), pp. 79–90. Available at: 10.1287/trsc.5.1.79.

published journal article

Development and evaluation of a knowledge-based system for traffic congestion management and control

Transportation Research Part C: Emerging Technologies

Publication Date

December 1, 2001
Suggested Citation
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.

conference paper

Transit ridership, bus ridership, and physical activity in a low income community

Proceedings of the annual meeting of the association of collegiate schools of planning (ACSP), cincinnati, OH

Publication Date

November 1, 2012
Suggested Citation
D. Houston, M. Boarnet, W. Li, S. Spears and D. Yang (2012) “Transit ridership, bus ridership, and physical activity in a low income community”, in Proceedings of the annual meeting of the association of collegiate schools of planning (ACSP), cincinnati, OH.

conference paper

A real-time information processing algorithm for the evaluation and implementation of ATMS strategies

Proceedings of the intelligent vehicles `92 symposium

Publication Date

June 1, 1992

Abstract

One component of the overall intelligent vehicle highway system (IVHS) is the advanced traffic management system (ATMS). An ATMS functions as the central nervous system of the overall transportation system, receiving and combining inputs from a variety of standard (on-street loops, operator-inputs) and advanced technology (image processing, in-vehicle probes) sources. Evaluation of ATMS strategies involves simulation of large systems of traffic actuated controllers and, ultimately, development of dynamic ‘real-time’ optimization strategies. In general, existing simulation and optimization tools were developed for ‘off-line’ analysis and typically impose restrictions on the types of signal control systems which can be simulated. This paper focuses on development of a ‘real-time’ information processing algorithm, based on a macroscopic, platoon-based model of traffic flow, for the evaluation of systems of coordinated and uncoordinated traffic actuated controllers.¡¿

Suggested Citation
J.D. Leonard, B. Ramanathan and W.W. Recker (1992) “A real-time information processing algorithm for the evaluation and implementation of ATMS strategies”, in Proceedings of the intelligent vehicles `92 symposium, pp. 225–229. Available at: 10.1109/IVS.1992.252261.

working paper

Commercial Fleet Demand for Alternative-Fuel Vehicles

Publication Date

April 1, 1996

Abstract

Fleet demand for alternative-fuel vehicles (“AFVs” operating on fuels such as electricity, compressed natural gas, or methanol) is investigated through an analysis of a 1994 survey of 2,000 fleet sites in California. This survey gathered information on site characteristics, awareness of mandates and incentives for AFV operation, and AFV purchase intentions. The survey also contained stated preference tasks in which fleet decision makers simulated fleet-replacement purchases by indicating how they would allocate their choices across a “selector list” of hypothetical future vehicles. A discrete choice model was estimated to obtain preference tradeoffs for fuel types and other vehicle attributes. The overall tradeoff between vehicle range and vehicle capital cost in the sample was $80 per mile of range, but with some variation by fleet sector. tradeoff The availability (density) of off-site alternative fuel stations was important to fleet operators, indicating that fleets are willing to trade off more fuel infrastructure for changes in other attributes, e.g., increased capital or operating costs, or more limited vehicle range. Public fleets (local and county government) were the most sensitiv the capital cost of new vehicles. Along with schools, they are the only fleet sector where reduced tailpipe emission levels are a significant predictor of vehicle choice. Fleet operators in the private sector base their vehicle selection less on environmental concerns than on practical operational needs.

Suggested Citation
Thomas F. Golob, Jane Torous, Mark Bradley, David Brownstone, Soheila Soltani Crane and David S. Bunch (1996) Commercial Fleet Demand for Alternative-Fuel Vehicles. Working Paper UCI-ITS-WP-96-5. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/7d21x5s9.

conference paper

Race, Socioeconomic Status, and Lead Concentrations in Urban Soil: Implications for Health Inequities

APPAM 2020 International Conference

Publication Date

July 23, 2020

Author(s)

Shahir Masri, Alana MW LeBrón, Michael David Logue, Enrique Valencia, Abel Ruiz, Abigail Reyes, Jun Wu

Abstract

Background. Communities of color and residents of urban and low-income areas a…

Suggested Citation
Shahir Masri, Alana MW LeBrón, Michael David Logue, Enrique Valencia, Abel Ruiz, Abigail Reyes and Jun Wu (2020) “Race, Socioeconomic Status, and Lead Concentrations in Urban Soil: Implications for Health Inequities”. APPAM 2020 International Conference, APPAM. Available at: https://appam.confex.com/appam/int20/meetingapp.cgi/Paper/35264 (Accessed: August 21, 2025).

working paper

On the Costs of Air Pollution from Motor Vehicles

Publication Date

September 5, 1995

Associated Project

Working Paper

UCI-ITS-WP-94-9, UCTC 237

Areas of Expertise

Abstract

Air pollution is frequently the stated reason for special measures aimed at controlling motor vehicles. In the United States, motor vehicle emission standards are set explicitly in clean air legislation, while policies at several levels of government are designed to reduce the use of cars for particular purposes like commuting. In Europe, high fuel taxes and subsidies to urban mass transit and intercity rail travel in large part aim to reduce car use.

Suggested Citation
Kenneth A. Small and Camilla Kazimi (1995) On the Costs of Air Pollution from Motor Vehicles. Working Paper UCI-ITS-WP-94-9, UCTC 237. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/0sx81025.

published journal article

Covid-19, intentions to change modes, and how they materialized - Results from a random survey of Californians

Transportation Research Part A: Policy and Practice

Abstract

Drawing insights from a random survey of Californians conducted in May 2021, we explore how the COVID-19 pandemic impacted Californians’ preferences for various transportation modes and analyze obstacles to increasing transit use. As COVID-19 disrupted habits and created health concerns for shared modes, many Californians expressed a desire to use transit and transportation network companies less after the pandemic, while intentions for driving were mixed. However, intentions to drive less did not materialize, possibly because the pandemic reinforced Californians’ car use habits, and many firms have been urging their employees to return to the office. Without new incentives and measures that increase the generalized cost of driving, the future of transit appears grim, as the intentions of the 28.9% of Californians 18 and over who intended to use transit less post-COVID (versus only 7.3% who wanted to use it more) appear to be realized. Hispanics, choice riders, and those who intend to telecommute more post-pandemic stated that they would use transit less. A silver lining is the substantial uptick in intentions to walk and bike more (25.9%), with just 8% of Californians stating the opposite. The main reasons Californians would not take transit post-pandemic do not include health concerns and are the same in 2021 as in 2017: a personal vehicle offers more flexibility and convenience. Younger adults, people with more education, and affluent households (the so-called “choice riders”) also deplore transit’s insufficient reach and frequency. Our work underscores the intricate interplay between the pandemic, transportation intentions, and actual behavior.

Suggested Citation
Farzana Khatun and Jean-Daniel Saphores (2023) “Covid-19, intentions to change modes, and how they materialized - Results from a random survey of Californians”, Transportation Research Part A: Policy and Practice, 178, p. 103882. Available at: 10.1016/j.tra.2023.103882.