Tierra Bills

Tierra S. Bills is an Assistant Professor of  Public Policy and Civil and Environmental Engineering at the University of California, Los Angeles. She specializes in the measurement of transportation planning and system outcomes, and travel demand modeling, with a special emphasis on transportation equity. Dr. Bills brings a unique and innovative perspective to the challenge of transportation inequity, aimed at impacting transportation science, practice, and quality of life for disadvantaged communities. She has worked in the transportation equity domain since 2009 and her current work builds off this long track record, including her master’s research, dissertation work, study and training as a Research Scientist at IBM Research, Michigan Society Fellowship research, and previous work as an Assistant Professor at Wayne State University.

Dr. Bills has extensive training in travel demand modeling and is engaged in ongoing work on representation of transport disadvantaged groups in household travel surveys, which are traditionally used to estimate and validate travel demand models. This is the first step to developing travel models capable of reflecting the preferences and behaviors of disadvantaged travelers and fine-grain transportation equity outcomes. Dr. Bills also works to advance accessibility measurement for transportation project evaluation, and develops strategies for ranking alternative transportation plans using equity-based criteria. Her work is published in a range of journals including Transport Policy and Transportation Research Record, and a recent contribution to the popular planning research press: The Metropole. She also currently serves as a Guest Editor on a Special Issue of Transportation Research Part D.

Dr. Bills has a strong record of advocacy for transportation equity and representation in STEM fields, including providing testimony for the a U.S. House of Representatives’ subcommittee hearing (see: https://science.house.gov/hearings/field-hearing-smart-mobility-its-a-community-issue), membership on the Equity in Transportation Committee of the Transportation Research Board, and co-developing an entry on her research in the ColorMePhD coloring book series (see: https://ce.berkeley.edu/news/2511).

 

Selected Publications

Bills, Tierra (2022). Advancing the Practice of Regional Transportation Equity Analysis: A San Francisco Bay Area Case Study. Transportation Research Part A. (Pending)

Goodspeed, Robert, Meixin Yuan, Aaron Krusniak, and Tierra Bills. (2021). Assessing the Value of New Big Data Sources for Transportation Planning: Benton Harbor, Michigan Case Study. 17th International Conference on Computational Urban Planning and Urban Management (CUPUM).

Bills, Tierra. S., & Carrel, A. L. (2021). Transit Accessibility Measurement Considering Behavioral Adaptations to Reliability. Transportation Research Record, 0361198120986567.

Nahmias-Biran, Bat-hen, Tierra Bills, and Yoram Shiftan. Incorporating Equity Consideration in Transport Project Evaluation: San Francisco Bay Area Case Study. Presented at the 96th Transportation Research Board Annual Meeting, Washington, DC, January 9th, 2017

Bills, Tierra, and Joan Walker (2017). Looking beyond the mean for equity analysis: Examining distributional impacts of transportation improvements. Transport Policy, 54, 61-69.

Bills, Tierra., Bryant, R., & Bryant, A. W. (2014). Towards a frugal framework for monitoring road quality. In Intelligent Transportation Systems (ITSC), 2014 IEEE 17th International Conference on ITS (pp. 3022-

3027). IEEE.

Bills, Tierra, Elizabeth Sall, and Joan Walker (2012). Activity-based Travel Demand Models and Transportation Equity Analysis: Research Directions and An Exploration of Model Performance. In Transportation Research Record: Journal of the Transportation Research Board, Transportation Research Board of the National Academies, Washington, D.C.

 

 

Hao Ding

Hao Ding is a doctoral student in Urban Planning, focusing on urban design and transportation planning. His research interests include the equity and justice impacts of urban design regulations, the interaction between urban form and transportation, and transportation equity. His most recent works examine the effects of urban design and land use regulations on place identities in the Asian American ethnoburbs in Los Angeles, and the effects of conventional local transportation planning practices on housing production and affordability. He is also a Graduate Student Researcher at the Institute of Transportation studies, and has been involved in several research projects that study the past, present, and future of California’s land use and transportation systems, sexual harassment on public transit, homelessness in transit environments, and public transit during the Covid-19 pandemic.

Samuel Speroni

Sam Speroni is a doctoral student in the UCLA Department of Urban Planning and a researcher with the UCLA Institute of Transportation Studies and UCLA Lewis Center for Regional Policy Studies.  He completed his master’s degree in Urban and Regional Planning, also at UCLA, in June 2020.  Sam is advised by Dr. Evelyn Blumenberg and Dr. Brian D. Taylor.

Sam’s primary research interest lies at the intersection of transportation, education, and new mobility, where he looks for ways to improve equitable access to educational opportunities for vulnerable and disadvantaged student populations.  His research extends to many other aspects of travel behavior and transportation systems, all with an emphasis on equity.  Sam’s recent applied planning research project analyzing high school students’ ridehail trips to school for HopSkipDrive (full report | policy brief) received the national Neville A. Parker Award for outstanding master’s capstone in transportation policy and planning from the Council of University Transportation Centers (CUTC).

Sam is a Future Leaders Development fellow of the Eno Center for Transportation in Washington, D.C., and in 2020 he was named the Pacific Southwest Region University Transportation Center (PSR UTC) outstanding student of the year.  He is also the recipient of the Dwight D. Eisenhower Transportation Graduate Fellowship (2019 and 2020) and the Intelligent Transportation Systems California / California Transportation Foundation joint graduate scholarship (2020).

Prior to UCLA, Sam was a high school English teacher and school administrator in Charlotte, North Carolina, through Teach for America.  Originally from New England, Sam grew up in Massachusetts and earned his bachelor’s degree in Urban Studies with honors from Brown University in 2011, where he was also captain of the varsity swimming & diving team.