research report

Policies to Improve Transportation Sustainability, Accessibility, and Housing Affordability in the State of California

Abstract

This report presents an analytical review of empirical research on the interactions between housing availability and production, travel behavior, accessibility, land use policies, and transportation policies. It identifies lessons from this review for California state legislative efforts to improve housing and transportation linkages, and to increase both transportation sustainability and housing affordability. Relevant California state efforts include legislation to influence parking standards; to require up-zoning near transit stations; to influence regional housing and transportation planning goals; and to change environmental review to focus on reducing vehicle miles traveled instead of accommodating road traffic.

published journal article

Examining the Effects of the Sacramento Dockless E-Bike Share on Bicycling and Driving

Abstract

One way cities are looking to promote bicycling is by providing publicly or privately operated bike-share services, which enable individuals to rent bicycles for one-way trips. Although many studies have examined the use of bike-share services, little is known about how these services influence individual-level travel behavior more generally. In this study, we examine the behavior of users and non-users of a dockless, electric-assisted bike-share service in the Sacramento region of California. This service, operated by Jump until suspended due to the coronavirus pandemic, was one of the largest of its kind in the U.S., and spanned three California cities: Sacramento, West Sacramento, and Davis. We combine data from a repeat cross-sectional before-and-after survey of residents and a longitudinal panel survey of bike-share users with the goal of examining how the service influenced individual-level bicycling and driving. Results from multilevel regression models suggest that the effect of bike-share on average bicycling and driving at the population level is likely small. However, our results indicate that people who have used-bike share are likely to have increased their bicycling because of bike-share.

dataset

Truck idling and parking data for AB 617 disadvantaged communities study

Abstract

This project investigates air pollution in California communities disproportionately affected by their proximity to transportation corridors, industrial facilities, and logistics centers, focusing on truck-related activities, including idling, parking search, and parking demand, using comprehensive datasets and robust models employing techniques such as Random Forest, Convolutional Neural Network, Bayesian Ridge Regression, and Spatial Error Model. Key findings reveal factors affecting idling times, parking search times, and parking demand, with heavy-duty trucks having the highest idle times and parking search challenges concentrated around transportation arteries and freight yards. The Spatial Error Model highlights relationships between truck activities, socio-economic variables, and air pollution in AB 617 communities. Based on these findings, preliminary policy recommendations include targeted anti-idling campaigns, improved truck parking facilities, cleaner fuels and technologies, enhanced routing efficiency, stricter emission standards, and strengthened land-use planning.

Please reach out to the project Principal Investigator for more information.

published journal article

Does Bike-share Enhance Transport Equity? Evidence from the Sacramento, California Region

Abstract

This study examines the rate of bike-share adoption by individuals from different socio-demographic groups and living in different bicycling contexts, as well as how individuals incorporate bike-share service into their travel patterns for different travel purposes and change their use of other modes. Data are from a two-wave survey of bike-share users and a parallel household survey of residents in the Sacramento region. Modeling results for bike-share adoption and use frequency show that low-income individuals are less likely to adopt bike-share but use the service more frequently than other income groups when they do adopt. Low-income users, people of color, and non-auto owners are more likely than other groups to use bike-share frequently for many trip purposes. Individuals living in areas with a stronger biking culture and surrounded by bike infrastructure are less likely to adopt the service and less likely to use it for purposes other than commuting. All users change their use of other modes when they incorporate bike-share into their travel patterns, but low-income individuals, people of color, and non-auto owners would be more severely impacted if the service were to stop.

policy brief

Travel Varies Greatly Between Voluntary Versus Involuntary Carless Households in California

Abstract

In spite of the critical importance of mobility for quality of life and economic well-being, the travel behavior of households without motor vehicles has received insufficient attention even though “carlessness” may bethe most vivid expression of mobility disadvantage in our car-centric society. Approximately 10.6 million (9 %) of U.S. households do not own a motor vehicle (car, pickup, van, SUV, or motorbike), including over one million in California. These “carless” households form two groups: (1) involuntarily carless households who are forced to live without cars, and (2) voluntarily carless households who chose to do so. Since one of the strategic goals of federal transportation policy is “to increase transportation choices and access to transportation services for all” it is essential to understand the travel behavior of households who are unable to own a motor vehicle. Indeed, many involuntarily carless households are experiencing economic hardship, disabilities, racial and age discrimination, or cultural barriers. Understanding the travel pattern of voluntarily carless households is also necessary to formulate policies aimed at decreasing vehicle use. Reducing personal vehicle use would help relieve congestion, decrease road accidents, improve air quality, cut emissions of greenhouse gases, and improve the health of people who switch to more active modes, such as walking and biking.

policy brief

Shifting Transit Use in COVID-19 Pandemic and Its Implications for Transit’s Recovery

Abstract

During the first year of the COVID-19 pandemic, public health and transit agency officials recommended that people drastically curtail their interactions with others to slow the spread of illness. On public transit, where strangers congregate on large vehicles and travel together, the decline in riders was especially dramatic. While walking, biking, and driving, which enable social distancing, substantially recovered in 2021 to pre-pandemic levels, transit use remained – and remains – depressed. But transit use neither fell nor recovered uniformly over the course of the pandemic. While ridership declined in most places, it did so unevenly across neighborhoods and users. Our research suggests that in the early part of the pandemic, transit use declined more dramatically among higher-income people, who were more likely than lower-wage workers to work from home. Because people who owned automobiles could travel about without coming in close contact with strangers, and because vehicle access is positively related to income, those who rode transit early in the pandemic were more likely to be low-income, Black, Hispanic, and immigrants than pre-pandemic transit riders.With many workers still working from home, at least part-time, it is not clear when – or whether – transit trips into and out of major office centers will recover to their former levels. If that is the case, transit demand and service will likely continue to center around lower-income neighborhoods.

policy brief

Student Transportation Options Provided by California Community Colleges Often Limited to Parking Permits and Transit Passes

Publication Date

November 17, 2022

Author(s)

Madeline Brozen, Rasik Hussain, Nicole Matteson

published journal article

Grocery shopping in California and COVID-19: Transportation, environmental justice, and policy implications

Abstract

To understand how COVID-19 changed grocery shopping and explore implications for transportation and environmental justice, we surveyed in May 2021 California members of KnowledgePanel®, the largest and oldest U.S. probability-based panel. We asked how frequently Californians grocery shopped before and during the pandemic, and how they may grocery shop afterward in-store, online with home delivery (“e-grocery”), or online with store/curbside pick-up (“click-and-pick”). We found that most Californians continued to grocery shop in-person during the pandemic, although less frequently than before. Many relied more on e-grocery (+8.9 %) and click-and-pick (+13.3 %), although older generations remained attached to in-store shopping. African American households grocery shopped in-store less than Whites pre-pandemic; post-pandemic, they may compensate with more e-grocery and click-and-pick. While higher levels of environmental injustice (based on CalEnviroScreen) were associated with less in-store shopping, we found no association with e-grocery or click-and-pick. Our results have implications for travel, food logistics, and parking management.

policy brief

Barrier Effects of Freeways for Pedestrian and Bicycle Travel

research report

Understanding Transportation Programs and Services at California Community Colleges

Publication Date

November 9, 2022

Author(s)

Madeline Brozen, Rasik Hussain, Nicole Matteson

Abstract

High transportation costs and access barriers can make it difficult for community college students to manage employment, household responsibilities, and education, negatively affecting their academic success. Understanding the state of existing transportation services and programs at California community colleges is the first step to addressing these barriers. We inventoried the transportation services, programs, and costs at 115 of the 116 California community colleges as advertised on each campus’ website. We found that most community colleges offer some form of parking or public transit student subsidies but little else. Due to the state education code, parking costs were similar across campuses. In contrast, transit pass costs varied from $0 to more than $100 per semester. On average, students paid more for transit passes than for parking permits. Throughout the search process, information on the campus’ transportation programs and services was difficult to locate since each campus posted this information in different places on their websites. The findings suggest that more colleges should consider offering low-cost transit passes by assessing a transportation fee or enacting partnerships with other government entities. California community colleges may also want to consider expanding how they provide transportation support and better publicizing information on transportation and standardizing how information is provided. Overall, community colleges, with the support of the State, have opportunities to better support students’ transportation needs to ensure that transportation access is not a barrier to educational outcomes.