TSRC

Staging at the Curb: Evaluating the Impacts of Shared Automated Vehicle Fleet Operations Under Curb Usage Restrictions

Bahk, Younghun
Hyland, Michael
Susan Shaheen
Wolfe, Brooke
Cohen, Adam
2026

Shared automated vehicle (SAV) ridehailing services are now operating in several metropolitan regions in the United States. While providing benefits, SAV services may exacerbate issues related to curb usage and vehicle kilometers traveled (VKT) in urban areas. The objective of this study is to provide guidance to cities by evaluating the impacts of SAVs’ short-term curb usage for staging between serving ride requests, under different curb restrictions and SAV operational strategies. We focus on the following performance metrics: VKT, curb productivity, customer wait time, and customer...

Advancing Air Mobility: Considering Equity in Emerging Transport Systems

Cohen, Adam
Susan Shaheen
2026

The Research Handbook on Air Transport Management brings together leading academic researchers from around the world to reflect on and synthesise the state of the art in their respective subject specialisms. In so doing, the Handbook demonstrates the depth and diversity of research into various facets of flight, and identifies areas requiring future work.

Navigating Uncertainty in Advanced Air Mobility: Scenario Planning for Policy Pathways at San Francisco International Airport

Susan Shaheen
Cohen, Adam
Wolfe, Brooke
2026

Advanced Air Mobility (AAM) includes innovative aviation technologies and services that could alter how people and goods are transported. However, future AAM growth and potential regional integration are uncertain and influenced by a range of factors. In this paper, we report findings from expert interviews (n = 35) and a scenario planning workshop (n = 32 stakeholders), conducted between August 2024 and July 2025, to explore potential alternative futures for AAM at the San Francisco International Airport (SFO) and the greater San Francisco Bay Area. We applied a two-axis framework:...

Mobility 10X: Accelerating Transportation Innovation in California

Toth, Alan
Susan Shaheen
Podolsky, Laura
2026

The magazine features 10 stories that highlight the breadth and impact of the Resilient and Innovative Mobility Initiative's (RIMI's) work across the University of California Institute of Transportation Studies (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...

What Should Agencies Measure to Decide If Microtransit Is Working?

Hyland, Michael
Watkins, Kari
Susan Shaheen
2026

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.

Navigating the Gig Economy: Transportation Labor Challenges Facing California’s App-based Ridehailing and Courier Drivers

Susan Shaheen
Wolfe, Brooke
Cohen, Adam
2026

Given the dynamic landscape surrounding the classification of workers in California, it is important to consider how the existing legal and regulatory environment may impact app-based gig drivers, including transportation network companies (TNCs, also known as ridehailing) and courier network services (CNS). Using a multi-method approach, we conducted a literature review (n = 41 sources), expert interviews (n = 8), and case study analysis (n = 7) between October 2022 to May 2024 to better understand how California’s gig drivers are impacted by state legislation and regulation (i.e.,...

“Three Ps in a MOD:” Role for Mobility on Demand (MOD) Public-Private Partnerships in Public Transit Provision

Lucken, Emma
Karen Trapenberg Frick
Susan Shaheen
2019

The growing number of public transportation agencies partnering with Mobility on Demand (MOD) or Mobility as a Service (MaaS) companies raises the question of what role MOD companies can, should, and currently play in the provision of public transport. In this article, we develop a typology reflecting 62 MOD public-private partnerships (MOD PPPs) in the United States and present lessons learned. We conducted 34 interviews with representatives from four MOD companies and 27 public agencies. The interviews spanned October 2017 to April 2018. The resulting MOD PPP typology consists of four...

Concurrent Air Quality Analysis Under the National Environmental Policy Act and Transportation/Air Quality Conformity

Susan Shaheen
Guensler, Randall
Mar, Francisca
1995

This paper addresses the direct and indirect relationships between the National Environmental Policy Act (NEPA) and the new conformity requirements. This paper concludes that NEPA and transportation/air quality conformity processes should be concurrent. The need for concurrent determinations is supported by five arguments: 1) the legislative history of conformity indicates that project conformity determinations be made during the NEPA process; 2) general NEPA requirements specify coordination between environmental processes; 3) the level of technical detail required for conformity analyses...

Car Sharing and Mobility Management: Facing New Challenges with Technology and Innovative Business Planning

Wagner, Conrad
Susan Shaheen
1998

More car sharing organisations are beginning to appear throughout Europe and North America. The use of existing and new technologies in an innovative way offers tremendous opportunities for this industry to grow.

Carsharing in Europe and North American: Past, Present, and Future

Susan Shaheen
Sperling, Daniel
Wagner, Conrad
1998

Most cars carry one person and are used for less than one hour per day. A more economically rational approach would be to use vehicles more intensively. Carsharing, in which people pay a subscription plus a per-use fee, is one means of doing so. Carsharing may be organized through affinity groups, large employers, transit operators, neighborhood groups, or large carsharing businesses. While carsharing does not offer convenient access to vehicles, it does provide users with a large range of vehicles, fewer ownership responsibilities, and less cost (if vehicles are not used intensively)....