published journal article

Safe streets for some: A review of local active transportation responses across the U.S. during the COVID-19 pandemic

Journal of Transport & Health

Publication Date

May 1, 2023

Author(s)

Matthew Dean, Kaelin A. Amaya, Jennifer Hall, Kalinda Marie Gupta, Rachael T. Panik, Jeanette Gustat, Angie L. Cradock

Abstract

Introduction & research objectives The COVID-19 pandemic significantly disrupted daily travel. This paper contrasts 51 US cities’ responses, namely street reallocation criteria and messaging related to physical activity (PA) and active transportation (AT) during the early months of the pandemic. This study can be utilized by cities for aiding in the creation of locally responsive policies that acknowledge and remedy a lack of safe active transportation. Methods A content analysis review was conducted of city orders and documents related to PA or AT for the largest city by population in all 50 US states and the District of Columbia. Authoritative documents issued from each city’s public health declaration (ca. March 2020) to September 2020 were reviewed. The study obtained documents from two crowdsourced datasets and municipal websites. Descriptive statistics were used to compare policies and strategies, with a focus on reallocation of street space. Results A total of 631 documents were coded. Considerable variation existed in city responses to COVID-19 that impacted PA and AT. Most cities’ stay-at-home orders explicitly permitted outdoor PA (63%) and many encouraged PA (47%). As the pandemic continued, 23 cities (45%) had pilot programs that reallocated street space for non-motorized road users to recreate and travel. Most cities explicitly mentioned a rationale for the programs (e.g., to provide space for exercise (96%) and to alleviate crowding or provide safe AT routes (57%)). Cities used public feedback to guide placement decisions (35%) and several welcomed public input to adjust initial actions. Geographic equity was a criterion in 35% of programs and 57% considered inadequately sized infrastructure in decision-making. Conclusions If cities want to emphasize AT and the health of their citizens, safe access to dedicated infrastructure needs to be prioritized. More than half of study cities did not instate new programs within the first 6 months of the pandemic. Cities should study peer responses and innovations to inform and create locally responsive policies that can acknowledge and remedy a lack of safe AT.

Suggested Citation
Matthew D. Dean, Kaelin A. Amaya, Jennifer Hall, Kalinda Marie Gupta, Rachael T. Panik, Jeanette Gustat and Angie L. Cradock (2023) “Safe streets for some: A review of local active transportation responses across the U.S. during the COVID-19 pandemic”, Journal of Transport & Health, 30, p. 101603. Available at: 10.1016/j.jth.2023.101603.

published journal article

Using bilateral trading to increase ridership and user permanence in ridesharing systems

Transportation Research Part E: Logistics and Transportation Review

Suggested Citation
Neda Masoud, Roger Lloret-Batlle and R. Jayakrishnan (2017) “Using bilateral trading to increase ridership and user permanence in ridesharing systems”, Transportation Research Part E: Logistics and Transportation Review, 102, pp. 60–77. Available at: 10.1016/j.tre.2017.04.007.

research report

CARMEN Project 6: PNT with Signals of Opportunity and Real-World Jammed and Spoofed Environments

Publication Date

November 30, 2023

Author(s)

Zak Kassas

Areas of Expertise

Suggested Citation
Zak Kassas (2023) CARMEN Project 6: PNT with Signals of Opportunity and Real-World Jammed and Spoofed Environments. Final Report. CARMEN UTC. Available at: https://zenodo.org/doi/10.5281/zenodo.10256685 (Accessed: October 10, 2025).

working paper

Stochastic Dynamic Itinerary Interception Refueling Location Problem with Queue Delay for Electric Taxi Charging Stations

Abstract

A new facility location model and a solution algorithm are proposed that feature 1) itinerary-interception instead of flow-interception; 2) stochastic demand as dynamic service requests; and 3) queueing delay. These features are essential to analyze battery-powered electric shared-ride taxis operating in a connected, centralized dispatch manner. The model and solution method are based on a bi-level, simulation-optimization framework that combines an upper level multiple-server allocation model with queueing delay and a lower level dispatch simulation based on earlier work by Jung and Jayakrishnan. The solution algorithm is tested on a fleet of 600 shared-taxis in Seoul, Korea, spanning 603 km2, a budget of 100 charging stations, and up to 22 candidate charging locations, against a benchmark “naïve” genetic algorithm that does not consider cyclic interactions between the taxi charging demand and the charger allocations with queue delay. Results show not only that the proposed model is capable of locating charging stations with stochastic dynamic itinerary-interception and queue delay, butt that the bi-level solution method improves upon the benchmark algorithm in terms of realized queue delay, total time of operation of taxi service, and service request rejections. Furthermore, we show how much additional benefit in level of service is possible in the upper-bound scenario when the number of charging stations approaches infinity.

Suggested Citation
Jaeyoung Jung, Joseph Y.J. Chow, R. Jayakrishnan and Ji Young Park (2013) Stochastic Dynamic Itinerary Interception Refueling Location Problem with Queue Delay for Electric Taxi Charging Stations. Working Paper UCI-ITS-WP-13-2. Institute of Transportation Studies, Irvine, p. 28p. Available at: https://escholarship.org/uc/item/8xz102r3.

research report

Determinants of superior performance in public transit

Publication Date

August 1, 1987

Author(s)

Gordon (Pete) Fielding, Lee. Hanson

Final Report

UMTA-CA-11-0029-87-2

Areas of Expertise

Suggested Citation
Gordon J. Fielding and Lee. Hanson (1987) Determinants of superior performance in public transit. Final Report UMTA-CA-11-0029-87-2. Washington, DC : Springfield, Va.: Urban Mass Transportation Administration, University Research and Training Program ; Available through the National Technical Information Service. Available at: https://catalog.hathitrust.org/Record/102497314.

research report

Assessing the Environmental and Health Impacts of Port-Related Freight Movement in a Major Urban Transportation Corridor

Abstract

The San Pedro Bay Ports (SPBP) complex of Los Angeles and Long Beach is the largest container port in the U.S., and a very important contributor to both California’s and the nation’s economies. Although the benefits of the SPBP activities are enjoyed by the whole country, the burden of the congestion and air pollution it generates falls mostly on the shoulders of people who live and work in the transportation corridor serving the SPBP. This corridor includes two busy freeways, the I-710 and the I-110, and a busy rail link, the Alameda corridor. The objective of this paper is to explore an integrated approach for evaluating the environmental and health impacts of freight operations between the SPBP complex and downtown Los Angeles, some 22 miles north. Our integrated approach combines a number of models, including a microscopic traffic simulation model and an emissions model to better estimate the impacts of congestion on air pollution, emission estimates from line-haul and switching train activities, a spatial dispersion model, and a health impact model. We analyze emissions for year 2005, which serves as a baseline in various air pollution inventories of the SPBP complex. Our results show that emissions concentrations are strongly affected by meteorological conditions and seasonal variations (winter is worse than summer); moreover, we found that health impacts from NOx and PM exposure exceed 200 million dollars, which justifies a number of regional initiatives to improve air quality. Our analysis is a starting point for analyzing the economic efficiency of these initiatives, which include modal shift (from trucks to trains) and the Clean Trucks Program.

Suggested Citation
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.

conference paper

Role of vehicle technology on use: Joint analysis of the vehicle choice and miles traveled

ICMC2022: 7TH INTERNATIONAL CHOICE MODELLING CONFERENCE (ICMC)

Publication Date

May 24, 2022

Author(s)

Suggested Citation
David Bunch, Debapriya Chakraborty and David Brownstone (2022) “Role of vehicle technology on use: Joint analysis of the vehicle choice and miles traveled”, in ICMC2022: 7TH INTERNATIONAL CHOICE MODELLING CONFERENCE (ICMC). ICMC2022: 7TH INTERNATIONAL CHOICE MODELLING CONFERENCE (ICMC), Reykjavik, Iceland.

conference paper

Perspectives on Viable Alternative Fuels for Heavy-duty Vehicles in 2030s: Qualitative Interviews with California Fleet Operators

100th Transportation Research Board (TRB) Annual Meeting

Publication Date

January 1, 2021
Suggested Citation
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.

working paper

An Ordinal Multivariate Analysis of Accident Counts as Functions of Traffic Approach Volumes at Intersections

Publication Date

October 1, 1987

Author(s)

Thomas Golob, Bolie Ruhl, Henk Meurs, Leo J. G. van Wissen

Working Paper

UCI-ITS-WP-87-6

Areas of Expertise

Abstract

This research is concerned with the statistical analysis of accident counts at non-signalized intersections. The objective is to develop a method for determining general (non-linear) relationships between approach volumes and accident counts. The method must accommodate the testing of whether intersections of differing physical designs have higher or lower rates of accidents than predicted by traffic levels. It is assumed that only aggregate data are available: (1) counts of total accidents by type (e.g., injury versus property damage) without details concerning the locational position(s) of the vehicle(s) involved; and (2) aggregate traffic intensity on each intersection entry without details concerning turning volumes. The method involves the application of non-linear multivariate methods to variables treated as ordinal scales. A case study application involving four-leg and three-leg (“T”) non-signalized major arterial intersections in the Netherlands is described. The effect of bicycle traffic on accident rates is included in the case study analysis. The results indicate that there are three groups of each of the two types of intersections based on traffic flow patterns. For each group, a different functional form was found to relate accident rates and specific variables measuring traffic volumes. There were no significant differences among the physical design categories of the intersections in each group that were not accounted for by differences in traffic intensities.

Suggested Citation
Thomas F. Golob, Bolie Ruhl, Henk Meurs and Leo van Wissen (1987) An Ordinal Multivariate Analysis of Accident Counts as Functions of Traffic Approach Volumes at Intersections. Working Paper UCI-ITS-WP-87-6. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/8rt356ss.

published journal article

Jurisdictional Size and Residential Development: Are Large-Scale Local Governments More Receptive to Multifamily Housing?

Urban Affairs Review

Publication Date

May 1, 2022

Author(s)

Nicholas Marantz, Paul G. Lewis

Abstract

In the United States, particularly in high-cost urban areas, local resistance to multifamily housing development has been widely noted. In many metropolitan areas, legal authority over land-use regulation is assigned to jurisdictions that often are very small, and some scholars argue that this small-scale local control institutionalizes neighborhood-level opposition to new construction. Using census tracts as units of analysis, we assess the relationship between the population size of the city, county, or township that regulates a tract’s land use and the change in multifamily units between two recent waves of the American Community Survey (2008–2012 and 2014–2018). Results of regression analysis indicate that larger jurisdictional population size is indeed associated with increased multifamily construction. However, the relationship applies only for jurisdictions with populations exceeding 100,000 and decays at jurisdictional populations of more than 1 million. This nonlinearity may reflect quasi-monopolistic land-use control in the largest jurisdictions.

Suggested Citation
Nicholas J. Marantz and Paul G. Lewis (2022) “Jurisdictional Size and Residential Development: Are Large-Scale Local Governments More Receptive to Multifamily Housing?”, Urban Affairs Review, 58(3), pp. 732–766. Available at: 10.1177/1078087420988598.