published journal article

Terra Incognita: California Transit Agency Perspectives on Demand, Service, and Finance in the Age of COVID-19

Abstract

The COVID-19 pandemic upended transit use, finance, and management. To investigate these effects two years into the pandemic, this study conducted 21 semi-structured interviews with senior managers at transit agencies in the most populous U.S. state, California. It was found that the pandemic generated many operational and managerial challenges for transit agencies. Ridership plummeted, then slowly recovered, but is still well below pre-pandemic levels at most agencies. Commuter trips to and from major job centers were especially slow to return. In response to decreased demand, public health concerns, and uncertain finances, many agencies cut services and spending early on. As a result, fare revenues declined, in some cases precipitously. However, federal pandemic relief funds proved essential in filling budgetary gaps, stabilizing finances, preventing layoffs, and maintaining services. Other transit subsidies mostly bounced back robustly. The interviews suggest that, though California transit agencies experimented with free fares, few fareless programs were made permanent. Their challenges include considerable uncertainty associated with future travel demand, looming financial shortfalls at systems that formerly had high farebox recovery and are still drawing on federal pandemic funds to backfill their fare revenue losses, and protracted labor shortages of drivers and mechanics that are preventing many systems from providing desired levels of service.

published journal article

Real-Time Truck Characterization System: A Pilot Implementation of the Freight Mobility Living Laboratory (FML2)

Publication Date

September 5, 2024

Author(s)

Andre Tok, Guoliang Feng, Stephen Ritchie

Abstract

California possesses multiple major freight gateway and logistics facilities that serve both the state and the entire U.S. But the economic, environmental, and local community impacts of trucks, especially heavy-duty trucks that are currently essential to our supply chains and freight transportation system remain poorly measured due to the lack of comprehensive and detailed truck activity data. This paper describes the pilot implementation of the real-time, scalable, and cost-efficient Freight Mobility Living Laboratory (FML2). This system provides truck characterizations across multiple attributes, such as truck body types, axle-based and Gross Vehicle Weight Rating (GVWR)-based classification and is currently deployed at 30 detection locations in Southern California along major freight corridors to support freight modeling and analysis needs. This paper details the design of the FML2 from edge data processing, predictive model development, communication architecture, and backend data storage to the real-time data dashboard to visualize the classification results. Three case studies have been presented at the end of the paper to demonstrate the potential of FML2 for use by both researchers and practitioners to gain further insights on truck activities.

published journal article

Vehicle Access and Falling Transit Ridership: Evidence from Southern California

Abstract

This article examines pre-COVID declines in transit ridership, using Southern California as a case study. It first illustrates Southern California’s unique position in the transit landscape: it is a large transit market that demographically resembles a small one. It then draws on administrative data, travel diaries, rider surveys, accessibility indices, and Census microdata for Southern California, and demonstrates a strong association between rising private vehicle access, particularly among the populations most likely to ride transit, and falling transit use. Because the research cannot control quantitatively for the endogeneity between vehicle acquisition and transit use, the results are not causal. Nevertheless, the results strongly suggest that increasing private vehicle access helped depress transit ridership. Given Southern California’s similarity to most US transit markets, the conclusion is that vehicle access may have played a role in transit losses across the US since 2000.

research report

Advancing Alternative Fuel Aviation Technologies in California

Publication Date

February 1, 2025

Author(s)

Yati Liu, Mark Hansen, Jin Wook Ro, Colin Murphy

Abstract

The aviation sector in California is facing increased pressure to reduce its carbon footprint, leading to a growing interest in alternative fuel aviation (AFA) technologies such as sustainable aviation fuel (SAF), as well as electric- and hydrogen- powered aircraft. The report develops a California Aviation Energy Model (CAVEM), examining various AFA technologies and analyzing possible policy options. The analysis emphasizes the importance of SAF in the short term, with projections indicating sufficient supply for intrastate flights and capped vegetable oil-based fuel consumption. Long-term efforts are focused on electric and hydrogen-powered aircraft, which remain in the early stages of development. Electrification of intrastate flights is deemed feasible, with estimated electricity consumption amounting to a small percentage of overall electricity generation. The report highlights the necessity for additional policy incentives (such as tax exemptions) and a comprehensive policy framework to effectively promote sustainable aviation in the long run.

policy brief

A Quiet Revolution in California Transportation Planning and Finance

Abstract

Over the past century, surface transportation planning and programming gradually evolved from a largely ad hoc, locally funded affair to a highly formalized intergovernmental process, guided by both federal and state policy and supported mostly by fuel tax revenues. Metropolitan planning organizations, like the San Francisco Bay Area Metropolitan Transportation Commission and the Southern California Association of Governments, grew out of requirements that federally funded transportation projects be part of a continuing, comprehensive, and cooperative planning process. In California today, numerous state regulations require that transportation projects advance air quality, climate, equity, and public participation goals. Over the past several decades, however, this carefully constructed federal-state partnership has been reverting back toward greater local decision-making, driven by an increasing reliance on local revenue sources. Researchers at the UCLA Institute of Transportation Studies have been following these developments in California and across the nation.

policy brief

Student Access to Community College Relies Heavily on Private Vehicle Use

Publication Date

February 1, 2025

Author(s)

Susan Shaheen, Jaquelyn Broader, Adam Cohen, "Brooke (Schmidt) Wolfe "

Abstract

California’s 116 community colleges, attended by 1.9 million students, serves the largest and most diverse student body in California higher education. Transportation plays an important role in student community college access and retention, but the cost and accessibility can create a barrier to success. Community college students spend more on transportation than their counterparts at both public and private four-year institutions, largely due to the lack of on-campus or nearby affordable housing. The absence of high-quality public transit forces students to commute by private vehicle and manage the associated costs of gas, maintenance, and parking. However, these transportation challenges for community college students are frequently overlooked. To better understand the mobility challenges students face accessing community colleges and provide potential policy strategies to overcome these challenges, local transportation agencies, community college administrators, and students were interviewed at five California community colleges between September 2022 and October 2023. The state legislation on student transportation was also reviewed to understand current and past policy attempts to address community college transportation challenges.

policy brief

Local Government Strategies to Improve Shared Micromobility Infrastructure

Abstract

Shared micromobility (bikesharing and scooter sharing) experienced market growth since 2021, rebounding from the pandemic across markets in the US, Mexico, and Canada. In partnership with the North American Bikeshare and Scootershare Association (NABSA) and Toole Design, researchers at the Transportation Sustainability Research Center (TSRC) at UC Berkeley have collaborated on the data collection and analysis of the shared micromobility industry metrics through a series of annual reports beginning in 2019. This includes a series of operator and agency surveys. Most recently, TSRC researchers collaborated on an Operator Survey (n=29) and an Agency Survey (n=52), distributed between January 2023 and June 2023, of all known shared micromobility operators and agencies as part of the 2022 state-of-the-industry report. Similar surveys were deployed in January 2022 and May 2022. These surveys include questions about shared micromobility systems operating within those agency jurisdictions and operator markets.

website

MobilityGPT - Synthetic Data Generation Pipeline & Dataset

Abstract

MobilityGPT is a state-of-the-art model designed for human mobility modeling. Built as a decoder-only GPT model, it excels at generating mobility trajectories with high precision. By integrating transformer architecture with spatial awareness, MobilityGPT delivers superior trajectory predictions, making it a powerful tool for understanding and forecasting human movement patterns.

research report

Creating an Inclusive Bicycle Level of Service: Virtual Bicycle Simulator Study

Publication Date

February 1, 2025

Author(s)

Julia Griswold, Edna Aguilar, Han Wang, Md Mintu Miah

Abstract

Bicycle level of service (BLOS) is an essential performance measure for transportation agencies to monitor and prioritize improvements to infrastructure, but existing measures do not capture the nuance of facility differences on the state highway system. However, with the advancements in virtual reality (VR) technology, a VR bicycle simulator is an ideal tool to safely gather user feedback on a variety of bicycling environments and conditions. This research explored the benefits and limitations of using a VR environment to assess individuals’ bike infrastructure preferences. The research team conducted a bicyclist user experience survey in person, on SafeTREC’s VR bicycle simulator, and online and compared the results. The online survey consisted of showing participants pairs of VR videos of biking scenarios and asking them to choose the one that they preferred. To validate the online survey responses, the team conducted in-person experiments with a VR bike simulator using the same pairs of videos. The analysis indicates that 63 percent of the responses were consistent while a smaller percentage of responses (37 percent) changed after the simulator ride due to better perception provided by the simulator virtual environment. The outcome of this study helped to validate the online survey responses of the study.