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...
Geocoding is the process of assigning latitude and longitude coordinates to data that contain spatial information. Geocoded records of motor vehicle collisions are an invaluable resource for injury prevention researchers. The objective of this study is to apply the postmile referencing system for geocoding collisions on Korean expressways and summarize the methodology and results with comparative research efforts in the USA. A street network provided by Korea Expressway Corporation was cleaned and calibrated using ArcGIS and a customized Visual Basic for Applications (VBA) tool....
The Safe Transportation Research and Education Center (SafeTREC) is a multidisciplinary group affiliated with the School of Public Health and the Institute of Transportation Studies. Our mission is to inform decision-making and empower communities to improve roadway safety for all, with an emphasis on vulnerable road users in California. We achieve this by working with academics, government agencies, and community-based organizations. We currently have one position open. Please see the details below and upcoming review date.
On Wednesday, October 8, 2025, SafeTREC postdoctoral researcher Sujin Lee will present "Evaluate the effects of speed camera installation using telematics data in San Francisco" in the upcoming Metrolab Student Showcase as part of the Talk with the Experts Series. The webinar will showcase the groundbreaking research from the 2025 INRIX x MetroLab Challenge winners. UC Berkeley SafeTREC was...
Autonomous Vehicles (AV) Safety Dashboard - visualize AV crashes and mileage data in California
UC Berkeley SafeTREC is excited to announce the launch of our new Autonomous Vehicles (AV) Safety Dashboard, a set of tools that allows users to visualize all the reported crash incidents from 2014-2025 and all reported mileage data from 2019-2024 for autonomous vehicles with AV Testing and AV Driverless Testing Permits from the California Department of Motor Vehicles (DMV) during that time....
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...
UC Berkeley SafeTREC research data analyst Amalia Stahl will present "Autonomous Vehicle Safety in California: Visualizing AV Safety Data in a Simple and 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...
On Thursday, September 23, 2021, SafeTREC Applications Program Manager SangHyouk Oum presented, "SWITRS and TIMS Tools for Crash Data in California" via Zoom for the Injury Prevention Coalition in the County of San Luis Obispo.
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...
