published journal article

Examining Post-pandemic Ride-Hailing Use in California and Its Determinants

Abstract

The prevalence and utilization of ride-hailing grew substantially in the 2010s; however, this growth was halted by the onset of the COVID-19 pandemic. In light of the disruptive impacts of the pandemic, it remains to be seen whether ride-hailing use in the post-pandemic period will be similar to that of the pre-pandemic period. Given the negative externalities associated with ride-hailing before the pandemic (including increases in vehicle miles traveled, induced travel, and the replacement of trips made using more sustainable modes), it is crucial to understand the potential long-term impacts of the pandemic on ride-hailing use. This study uses data from two waves of a repeated cross-sectional survey of California residents to examine ride-hailing use during the post-pandemic period and its determinants. Specifically, the data are used to compare pre- and post-pandemic ride-hailing use, estimate hurdle models of post-pandemic ride-hailing frequency, and estimate a zero-inflated negative binomial regression model of the frequency of post-pandemic shared ride-hailing use. The results suggest that the use of ride-hailing for commuting trips is more common post-pandemic than it was pre-pandemic. Moreover, commuting frequency was positively associated with how often ride-hailing was used for commuting trips. The results also indicate that the uptake of shared ride-hailing is relatively low during the post-pandemic period, suggesting that additional strategies (such as encouraging vehicle electrification) may be needed to help address the negative externalities associated with ride-hailing. Overall, this information can inform policies that aim to mitigate the negative externalities associated with ride-hailing in the post-pandemic era.

book/book chapter

Mobility 10X: Accelerating Transportation Innovation in California

Publication Date

January 28, 2026

Author(s)

Abstract

The magazine features 10 stories that highlight the breadth and impact of RIMI’s work across the UC ITS campuses— Berkeley, Davis, Irvine, and UCLA. It also draws on related research funded through the UC ITS SB1 program, established by California’s Road Repair and Accountability Act of 2017, along with additional studies by UC ITS scholars and the broader research literature. Together, these efforts demonstrate how targeted research can achieve a 10x impact— shaping policy, influencing practice, and scaling solutions to California’s complex transportation challenges, from decarbonization to bolstering public transit and road safety. For policymakers, planners, and agency leaders, this magazine provides a roadmap for translating research into long-lasting, system-level improvements.

policy brief

Understanding Today’s Used Car Buyers Can Help Grow the Market for Used Electric Vehicles

Publication Date

January 1, 2026

Author(s)

Debapriya Chakraborty, Theodora Konstantinou, Julia Beatriz Guiterrez Lopez, Gil Tal

Abstract

New car sales is the primary metric for measuring electric vehicle (EV) adoption, however, monitoring transition to EVs overall will require knowing more about what is going on in the used car market. While there is limited research on used EV buyers, examining the characteristics and vehicle costs of individuals who currently purchase used vehicles could provide some helpful insights. This research explored the financial impact of a household that typically purchases a used car, choosing a used EV instead. To do this, the study analyzed consumer survey data that tracks households’ expenditure on vehicle purchasing and operations on a national scale to identify why households opt for new versus used vehicles and the consequent cost of vehicle ownership.

white paper

A Blueprint for Improving Automated Driving System Safety

Publication Date

July 1, 2024

Author(s)

Mollie Cohen D'Agostino, Cooper Michael, Marilia Ramos, Camila Correa Jullian

Abstract

Vehicle automation represents a new safety frontier that may necessitate a repositioning of the safety oversight systems. This white paper serves as a primer on the technical and legal landscape of automated driving system (ADS) safety. It introduces the latest AI and machine learning techniques that enable ADS functionality. The paper also explores the definitions of safety from the perspectives of standards-setting organizations, federal and state regulations, and legal disciplines. The paper identifies key policy options building on topics raised in the White House’s Blueprint for an AI Bill of Rights, outlining a Blueprint for ADS safety. The analysis concludes that potential ADS safety reforms might include either reform of the Federal Motor Vehicle Safety Standards (FMVSS), or a more holistic risk analysis “safety case” approach. The analysis also looks at caselaw on liability in robotics, as well as judicial activity on consumer and commercial privacy, recognizing that the era of AI will reshape liability frameworks, and data collection must carefully consider how to build in accountability and protect the privacy of consumers and organizations. Lastly, this analysis highlights the need for policies addressing human-machine interaction issues, focusing on guidelines for safety drivers and remote operators. In conclusion, this paper reflects on the need for collaboration among engineers, policy experts, and legal scholars to develop a comprehensive Blueprint for ADS safety and highlights opportunities for future research.

policy brief

Hydrogen Fuel Cell Drayage Trucks Can Advance California’s Climate Goals and Provide Health Benefits for Front Line Communities

Abstract

California has ambitious goals to introduce zero-emission technologies across various transportation sectors. Significant progress has been made over the past decades in deploying battery electric light-duty trucks, but heavy-duty diesel trucks are harder to “decarbonize” due to their operational demands and duty cycles, even though the benefits of replacing heavily polluting diesel trucks are significant. Front line communities where diesel vehicles operate the most, especially those near seaports and warehouses, bear the brunt of the pollution from these vehicles and stand to benefit the most from their electrification. Hydrogen fuel cell technology represents a promising approach for transitioning these trucks to zero-emission but the costs and benefits over time must be carefully considered. One way to do this with regard to environmental impacts is using a life cycle assessment (LCA) approach, which analyzes and accounts for the various impacts of fuel production and use, including overall energy use, emissions of greenhouse gases (GHGs), emissions of other air pollutants, and soil and water impacts.

research report

Partnering with Transportation Network Companies to Serve Low-Density Communities

Abstract

This study addresses the persistent challenge of delivering cost-effective, high-quality on-demand transit in low-density communities. Traditional microtransit services often struggle in such areas due to high fixed costs and limited opportunities to consolidate trips, while community partnerships with transportation network companies (TNCs) like Uber and Lyft are typically avoided due to concerns over data transparency and limited community control. To bridge this gap, a new business plan for cooperative TNC partnerships is proposed, in which a community-appointed service manager coordinates trip requests, distributes financial incentives to attract drivers to the community from nearby high-demand areas, and leverages the TNC’s existing digital infrastructure for driver dispatch and routing. This study evaluates this business plan through case studies of three Northern California communities presently served by microtransit, comparing microtransit’s measured performance against the predicted performance of a TNC operating under the proposed business plan using a simple metric that does not depend on the specific design of the transit system. Results show that TNCs can deliver higher levels of service and higher driver wages in all three communities and were more cost-effective than microtransit in two of the three. Applying the metric across California reveals that many communities with microtransit, and numerous other communities presently underserved by transit, would likely benefit from switching to TNC partnerships. This suggests that a large opportunity exists for using TNC partnerships to provide mobility in areas where other forms of transit are less effective.

policy brief

What Should Agencies Measure to Decide if Microtransit Is Working?

Abstract

California state agencies, public transit agencies, and cities have invested in dozens of microtransit pilot programs, often with the stated goals of improving access, filling gaps in fixed-route public transit service, and serving communities that are difficult to reach by traditional bus or rail. As microtransit services mature, agencies increasingly face decisions about whether to expand, modify, or discontinue microtransit services—and how to allocate scarce operating funds across competing transit priorities.Despite growing investment, there is no consistent approach to measuring whether microtransit services are delivering meaningful benefits relative to their costs, or whether those benefits are equitably distributed. Without clear and well-balanced performance metrics, agencies risk drawing the wrong conclusions about success or failure.

research report

Stakeholder Perspectives On the Transition to Zero Emission Off-Road Equipment

Abstract

California has set an ambitious target to transition 100% of off-road vehicles and equipment to zero-emission (ZE) alternatives by 2035 “where feasible,” as outlined in Executive Order N-79-20. Interviews were conducted with 16 stakeholders—contractors, manufacturers, rental firms, researchers, nonprofits, and public agencies. Intervieweesacknowledged positive attributes of ZE equipment, but barriers were more numerous and included inadequate charging infrastructure, limited grid access at job sites, high upfront equipment costs, limited ZE model availability, and complications with rental-based procurement models. Social and organizational barriers such as operator resistance, climate skepticism, and inequities faced by smaller firms were also noted. Most interviewees expressed skepticism that the 2035 ZE off-road goal is realistically achievable without significant policy and infrastructure support. Commonly recommended interventions included strengthening site-level grid capacity, expanding financial incentives and public investment, aligning regulations with market realities, and improving policymakers’ understanding of construction practices.

blog

Youth-Centered Mobility Research, Decision Making, and Design: An action plan to support young pedestrians' everyday urban mobility

Publication Date

December 31, 2025

Author(s)

Claire Nelischer

Abstract

Based on a literature review of strategies to support youth-centered mobility research, decision making, and design, this webpage presents a summary of the key findings and an action plan to guide future research and organizing in Los Angeles and beyond highlighting what’s known, what’s working, and what’s next.

policy brief

How California cities respond to state-level parking reform

Abstract

Minimum parking requirements—zoning regulations that require a certain number of parking spaces to be built with new developments—come with a long list of downsides. The requirements increase the costs of development, reduce housing densities, subsidize car ownership, reduce walkability, and make it difficult to adapt and reuse historic buildings. In response, cities as diverse as Anchorage, Buffalo, and San Diego have reduced or eliminated parking requirements in recent years.

In 2022, California became the first state to eliminate parking requirements in certain neighborhoods. Assembly Bill 2097 (AB 2097) prohibits, in most circumstances, local governments from imposing parking requirements within a half-mile of an existing or planned major transit stop such as a rail station, ferry terminal, or the intersection of frequent bus routes. The research team examined how cities are responding to this new statewide law and draw out lessons for parking policy as well as other types of state preemption of local land use regulations.