Data collection

2025 California Traffic Safety Survey released: Speeding, aggressive driving continue to be concerns

July 9, 2025
Submitted by Karen Nguyen Vo

UC Berkeley SafeTREC has released the California Traffic Safety Survey 2025. The study was led by Ewald & Wasserman Research Consultants (E&W) and conducted on behalf of the California Office of Traffic Safety (OTS) and SafeTREC. The California Traffic Safety Survey has been conducted annually since 2010, and this year's survey was conducted...

NEW: Updated Safe System Approach Toolkit

July 8, 2025
Submitted by Kris Leckie
UC Berkeley SafeTREC is excited to share an update and refresh to our Safe System Approach toolkit, including new strategies, easier navigation, and more!

Covers of the English and Spanish versions of the Safe System Toolkit

Our toolkit, ...

Street Story: A platform for community engagement

Street Story

Street Story is a community engagement platform provided by UC Berkeley SafeTREC in English and Spanish that allows residents, community groups, and agencies to collect information about transportation crashes, near misses, general hazards, and safe locations to travel. The tool is free to use, anonymous, and publicly accessible. Street Story is not a...

SafeTREC's Amalia Stahl to present at the 2025 Traffic Records Forum

June 30, 2025
Submitted by Lisa Peterson

UC Berkeley SafeTREC research data analyst Amalia Stahl will present "Autonomous Vehicle Safety in California: Visualizing AV Safety Data in a Simple andPromotional graphic for the 2025 Traffic Records Forum in Boston, MA Accessible Way for the General Public" at the Association of Transportation Safety Information Professionals (ATSIP) 2025 Traffic Records Forum on Monday, July 7, 2025. The Traffic...

Share your feedback now in the Pedestrian Level of Traffic Stress National Survey

June 20, 2025
Submitted by Karen Nguyen Vo

The Center for Pedestrian and Bicyclist Safety (CPBS) team at the University of Wisconsin, Milwaukee has launched a Pedestrian Level of Traffic Stress (PLTS) National Survey, where survey results will be used to help refine the PLTS, a tool that transportation agencies use to rate how comfortable pedestrians feel on specific roadways.

The survey aims to gather pedestrians’ perceived stress levels around...

California Traffic Safety Survey 2025

Ewald, Katrin
Wasserman, Lisa
2025

The 2025 Traffic Safety Public Opinion Study was conducted for the California Office of Traffic Safety (OTS) and the Safe Transportation Research and Education Center of UC Berkeley (SafeTREC). The findings of the 2025 Study are based on a sample size and eligibility criteria similar to previous years of data collection. A total of 2,319 responses were collected in April and May 2025 using an online selfadministered survey. Similar to previous years of the study, the survey panelists were provided through Marketing Services Group, a commercial sample and panel vendor.

The survey...

Evaluation of Wet Weather Accident Causation Criteria

Oh, Soonmi
Ragland, David R.
Chan, Ching-Yao
2008

This report documents findings from analysis of traffic collision data from sites that display high collision rates only under wet pavement conditions. These sites were selected using Caltrans safety engineers’ field reports, Wet Table C “investigation required” locations, and a new approach called Continuous Risk Profile (CRP). The geometric features at the sites were studied via field visits and review of as-built plans. Rapid spatial changes (i.e., vertical and horizontal curve in short distance), narrower lane width, lack of median, and wider total freeway width were some of the...

Drivers, Pedestrians, and Cyclists in California Want Complete Streets: Comparison of Results from Roadway Design Surveys of Pedestrians, Drivers, Bicyclists, and Transit Users in Northern and Southern California

Sanders, Rebecca L.
Griffin, Ashleigh
MacLeod, Kara E.
Cooper, Jill F.
2014

This paper compares findings from two recent surveys on roadway design preferences among pedestrians, drivers, bicyclists, and public transit users along major urban corridors in the metro areas of San Francisco and Los Angeles. Sponsored by the California Department of Transportation (DOT), the research explored design preferences that could increase perceived traffic safety, walkability, bikability, and economic vitality along urban arterials. Results from intercept surveys showed that roadway users desire similar design features along the test corridors, which carry 25,000-40,000...

SafeTREC's Liza Lutzker to present at 2025 SER Annual Meeting

May 29, 2025
Submitted by Lisa Peterson

UC Berkeley SafeTREC research data analyst Liza Lutzker will be presenting "Trends and disparities in pedestrian injuries and fatalities in hit-and-run crashes" in a poster session at the 2025 Society for Epidemiologic Research (SER) Annual Meeting on June 11th, 2025 in Boston, Massachusetts. This presentation draws from a current research project for the Center for Pedestrian and Bicyclist Safety (CPBS) that is examining recent trends and risk factors in pedestrian fatalities and injuries in hit-and-run...

Creating an inclusive bicycle level of service: Virtual bicycle simulator study

March 26, 2025
Submitted by Lisa Peterson
New report explores the benefits and limitations of using a VR environment to assess individuals’ bike infrastructure preferences

A new report by UC Berkeley Safe Transportation Research and Education Center (SafeTREC) co-authored by Julia Griswold, Edna Aguilar and Md. Mintu Miah, "Creating an inclusive bicycle level of service: Virtual bicycle simulator study" aims to assess how virtual reality (VR) technology can be used to gather user feedback on a variety of bicycling...