dissertation, thesis, or capstone

Vision Zero's Enforcement Problem: Using community engagement to craft equitable traffic safety strategies

research report

Transit Blues in the Golden State: Analyzing Recent California Ridership Trends

Publication Date

June 1, 2018

Author(s)

Andrew Schouten, Brian D. Taylor, Evelyn Blumenberg, Hannah King, Jacob Wasserman, Julene Paul, Madeline Ruvolo, Mark Garrett

Abstract

Transit patronage plunged staggeringly, from 50 to as much as 94 percent, during the first half of 2020 amidst the worst global pandemic in a century. But transit’s troubles in California date much earlier. From 2014 to 2018, California lost over 165 million annual boardings, a drop of over 11 percent. This report examines public transit in California in the 2010s and the factors behind its falling ridership. The research team finds that ridership gains and losses have been asymmetric with respect to location, operators, modes, and transit users. 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 have been down since 2014, worrisome underlying trends date back earlier as patronage failed to keep up with population growth. However, 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 located 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. While the 2010s proved a difficult decade for public transit in California, and the opening of the current decade has been an even bigger challenge, transit remains an essential public service. Effectively managing transit recovery in California will require a clear-eyed understanding of the substantially altered environment within which these systems large and small must now operate.

research report

Pilot Study of Driving Safety Counseling at the Memory Aging and Resiliency Clinic (MARC)

Abstract

The UC San Diego Training Research and Education for Driving Safety (TREDs) program worked with the Memory Aging and Resiliency Clinic (MARC) at the UC San Diego (UCSD) Department of Psychiatry to assess the feasibility, acceptability, and efficacy of driving safety counseling for patients with memory concerns. Patients who presented for care to the Memory Aging and Resiliency Clinic were given a battery of cognitive testing, for the purposes of assessing and diagnosing their memory issues, and this project supported additional testing during these visits, including vision and frailty testing as well as testing using a driving simulator where participant permission and time permitted. Counseling was provided to the patients at the Memory Aging and Resiliency Clinic clinic exit interview, including cognitive diagnosis. A post-recommendation assessment was provided to the patient or family within 1-2 months via phone. In total, 25 clients were seen: 6 were advised to stop driving, 2 to limit their driving; and the others were given advice on how to continue to driver safety. The pilot informed the generation of protocols on driving screening for other geriatric clinics, and these protocols have been posted at the Training Research and Education for Driving Safety website treds.ucsd.edu. The feasibility and acceptability of driving safety counseling have not been well studied to date in memory clinics, and this report provides guidance for implementing similar programs across the state.

research report

Long Distance Travel and Destination Attractiveness

Publication Date

June 1, 2018

Author(s)

Elizabeth McBride, Konstadinos Goulias, Adam Davis

Abstract

This report provides a summary of analyses using data from long-distance tours by each household from an 8-week California Household Travel Survey travel log. The first analysis uses Structural Equations Models (SEM) and a simpler variant called Path Analysis on three censored variables (tour miles by air, miles driving, and miles by public transportation) and two categorical variables (main trip tour purpose) and number of overnight stays. The second analysis uses Latent Class Cluster Analysis (LCCA) to identify five distinct, informative patterns of long-distance travel. This analysis shows that long-distance tours for vacation, business travel, medical, and shopping are substantially distinct in terms of their travel characteristics and correspond to different combinations of other activities in the tour and they are done by different types of households. The methods used here to identify the typology of long-distance travel can be easily expanded to include a variety of other explanatory variables of this type of behavior in more focused data collection settings.