Projects

Principal Investigator:

Madeline Brozen

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The costs and benefits of the transportation system are distributed unequally, leading to people receiving less access to opportunities. This report sought to understand how this issue plays out within Los Angeles County by analyzing trends in transportation patterns across race/ethnicity, income, gender, age, ability, and geography.

Principal Investigator:

John Gahbauer

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Principal Investigator:

Evelyn Blumenberg

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Ridership at many transit agencies in California is declining. One issue raised in Falling Transit Ridership, but only lightly explored, is the changing spatial location of low-wage work and workers in California, and the implications of these changes for commuting and transit use. Transit commuting is highest in dense urban neighborhoods where residents live reasonably close to employment opportunities. However, low-income households and low-wage employment has suburbanized over time (Kneebone 2009; Kneebone, 2017) making it increasingly difficult for workers to commute by transit. Drawing on data from the Longitudinal Employer-Household Dynamics (LEHD) program the project will quantify changes in the spatial location of employment and workers from 2002 to 2015 in the five major California metropolitan areas. In particular, the analysis will include (a) the extent to which jobs and workers have decentralized over time by wage group (low, medium, high) (b) the changing location of workers and employment relative to transit-friendly neighborhoods and transit supply. The second part of the analysis examines whether rising rents in some regions of the state are pushing workers to live further from their workplaces over time.

Principal Investigator:

Brian D. Taylor

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From 2014 to 2018, California lost more than 165 million annual boardings, a drop of over 11%. This project examines public transit in California in the 2010s and the factors behind its falling ridership. Transit ridership has been on a longer-term decline in regions like Greater Los Angeles and on buses, while ridership losses in the Bay Area are more recent. While overall transit boardings across the state are down since 2014, worrisome underlying trends date back earlier as patronage failed to keep up with population growth. But reduced transit service is not responsible for ridership losses, as falling transit ridership occurred at the same time as operators instead increased their levels of transit service.

What factors help to explain losses in transit ridership? Increased access to automobiles explains much, if not most, of declining transit use. Private vehicle access has increased significantly in California and, outside of the Bay Area, is likely the biggest single cause of falling transit ridership. Additionally, new ride-hail services such as Lyft and Uber allow travelers to purchase automobility one trip at a time and likely serve as a substitute for at least some transit trips. Finally, neighborhoods are changing in ways that do not bode well for public transit. Households are increasingly locating in outlying areas where they experience longer commutes and less transit access to employment. At the same time, a smaller share of high-propensity transit users now live in the state’s most transit-friendly neighborhoods.

Principal Investigator:

Anastasia Loukaitou-Sideris

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Transit use is on the decline in many American cities. Research has shown that concerns about transit safety may influence travel behavior and transit use, and that women are particularly fearful about victimization while travelling. Studies have also shown that women are also very concerned about one type of crime — sexual harassment — which often goes unreported, and thus remains largely invisible to transit operators.The research team will survey college students in 16 cities in six continents to examine their patterns of mobility and transit, with an emphasis on their feelings of safety on public transit and other transportation modes, experiences of sexual harassment, and other types of crime and victimization on public transport and other transportation modes. The results of the survey will establish the extent to which fear regarding their safety affects college students’ transit ridership, and the research team will examine how survey responses may vary because of the students’ sociodemographic characteristics.

Principal Investigator:

Martin Wachs

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Local Option Sales Taxes (LOSTs) are a popular form of local transportation finance in California. Researchers partially attribute the success of LOSTs to the inclusion of expenditure plans that outline specific projects and services to be delivered using measure revenue over the 20 or more years the measure will be in place. Expenditure plans are commitments on the part of sponsoring transportation agencies, but issues of accountability might compromise these commitments and we are not aware of any prior research into the tension between commitments to projects and commitments to accountability that are both included in LOSTs.This research will examine how well expenditure plans presented in measures reflect actual project delivery over the life of the sales tax.

Principal Investigator:

Izhak Rubin

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Researchers have been developing innovative methods for integrated traffic management and communications networking systems for autonomous transportation systems. These models provide for optimal on-ramp merging and adaptive formation of vehicular flows across highway lanes, with the goal of achieving high vehicular flow rates while reducing queueing delays. To effectively control vehicular flows and formations across the highway, researchers have developed new data communications protocols and algorithms.The research team proposes to translate its models and techniques to the design of autonomous transportation systems when aided by interconnected roadside unit (RSU) stations that form a backbone network infrastructure. The research team’s methods will be used to determine the best configuration of joint traffic management and data networking mechanisms, described by the locations and interconnection features of the RSU stations and the backbone network infrastructure that they form.

Principal Investigator:

Michael Manville

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A growing consensus among economists and economic geographers suggests that America’s most constrained housing markets, and in particular the constrained housing markets on California’s coast, impose high costs not just on people in those markets but on the nation as a whole, by inhibiting migration and placing a drag on productivity. Strict zoning regulations prevent people from moving to areas where they would be most productive, imposing costs that are quiet and atomized but that collectively are large. Despite gaining increasing attention in the last ten years, parking requirements remain relatively overlooked in the literature on land use restrictions. Existing attempts to quantify land use restrictiveness do not measure the stringency of minimum parking requirements, even though parking requirements are often the binding constraint on dense development.The research team proposes examining the relationship between minimum parking requirements, urban land markets, and travel behavior, using Silicon Valley as a case study. The team will specifically examine how minimum parking requirements: (1) Shape the locations and characteristics of new development, (2) Distort the location of firms and weaken agglomeration economies, and (3) Make driving less expensive.

Principal Investigator:

Mason Porter

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Every regular school day, LAUSD operates over 14,000 hours of service using 1,307 school buses to serve over 38,000 students, who attend more than 300 schools in more than 30 subdistricts, on 1,669 routes over a service area of about 750 square miles. Bus contractors own and operate another 700 school buses to provide service for LAUSD. LAUSD also provides service for midday, athletic events, after-school programs, and on weekends. The buses are subject to traffic conditions — operating both during peak traffic times and during non-peak traffic times — and to changing enrollment patterns. LA’s very large geographic area, as compared to other US cities, makes the problem particularly acute (and also scientifically interesting).The project team seeks to help the Student Transportation Operation of the LAUSD better match its capacity with demand. Specifically, UCLA seeks to answer the following stakeholder question: What is the best way to operate their bus service within regulatory and policy guidelines?

Principal Investigator:

Brian D. Taylor

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Principal Investigator:

Brian D. Taylor

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Public transit ridership has been falling nationally and in California since 2014. The San Francisco Bay Area, with the state’s highest rates of transit use, had until recently resisted those trends, especially compared to Greater Los Angeles. However, in 2017 and 2018 the region lost over five percent (>27 million) of its annual riders, despite a booming economy and service increases. This report examines Bay Area transit ridership to understand the dimensions of changing transit use, its possible causes, and potential solutions. We find that: 1) the steepest ridership losses have come on buses, at off-peak times, on weekends, in non-commute directions, on outlying lines, and on operators that do not serve the region’s core employment clusters; 2) transit trips in the region are increasingly commute-focused, particularly into and out of downtown San Francisco; 3) transit commuters are increasingly non-traditional transit users, such as those with higher incomes and automobile access; 4) the growing job-housing imbalance in the Bay Area is related to rising housing costs and likely depressing transit ridership as more residents live in less transit-friendly parts of the region; and 5) ridehail is substituting for some transit trips, particularly in the off-peak. Arresting falling transit use will likely require action both by transit operators (to address peak capacity constraints; improve off-peak service; ease fare payments; adopt fare structures that attract off-peak riders; and better integrate transit with new mobility options) and public policymakers in other realms (to better meter and manage private vehicle use and to increase the supply and affordability of housing near job centers).

Principal Investigator:

Evelyn Blumenberg

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The population of California is aging as life expectancy increases and birth rates decline. Projections from the U.S. Census Bureau show that by 2030, the number of seniors in California will increase to 10.6 million, almost a quarter of the state population. Closely related, but far less studied, is the aging of the workforce as the population ages and many older people delay retirement either because they enjoy working or depend upon earned income to meet their needs. From a recent low of less than 6 percent of the working population, the share of employed Americans who are older than age 60 has climbed to over 10 percent of all workers and is projected to exceed 13 percent of the employed population by the middle of the next decade. The objective of this study is to determine, using data from the California Household Travel Survey, whether there is a relationship in California between mobility and delayed retirement.

Principal Investigator:

Martin Wachs

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As the market share of zero-emissions hydrogen and electric vehicles increases in California, the motor vehicle fuel tax becomes less applicable as a user fee, and declining revenues could produce shortfalls for maintaining the transportation system. The authors of SB1 sought policy options to raise usage-based revenues from electric and zero-emissions transportation system users.This research was specified in SB1 as a study for the University of California at Davis. Professor Martin Wachs, an internationally-renowned transportation finance expert member of the SB 1077 Road User Charge Technical Advisory Committee, is assisting research at UC Davis with this study.

Principal Investigator:

Suzanne Paulson

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Principal Investigator:

Michael Manville

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In the last ten years transit use in Southern California has fallen significantly. This report investigates that falling transit use. The project examines patterns of transit service and patronage over time and across the region and considers an array of explanations for falling transit use: declining transit service levels, eroding transit service quality, rising fares, falling fuel prices, the growth of Lyft and Uber, the migration of frequent transit users to outlying neighborhoods with less transit service, and rising vehicle ownership. While all of these factors probably play some role, the research concludes that the most significant factor is increased motor vehicle access, particularly among low-income households that have traditionally supplied the region with its most frequent and reliable transit users.

Principal Investigator:

J.R. DeShazo

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Principal Investigator:

Suzanne Paulson

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