Geocoding

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 SangHyouk Oum presents on SWITRS & TIMS Tools for Crash Data in California

October 5, 2021

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. Event information in white and light blue text on a background of different shades of blue with and a photo of speaker SangHyouk Oum

Oum discussed how crash data...

NEW! SWITRS Statewide Summary Tool on TIMS

September 20, 2021

UC Berkeley SafeTREC’s Transportation Injury Mapping System (TIMS) has been developed to provide quick, easy and free access to California crash data from the Statewide Integrated Traffic Records System (SWITRS) that has been geo-coded to make it easy for users to query, map, and download collision data.

As part of an ongoing effort to support local and state agencies efforts to improve traffic safety, a new tool is now...

New TIMS feature: Users can now provide feedback on crash location errors

July 28, 2021

UC Berkeley SafeTREC’s Transportation Injury Mapping System (TIMS) has been developed to provide quick, easy and free access to California crash data from the Statewide Integrated Traffic Records System (SWITRS) that has been geo-coded to make it easy for users to query, map, and download collision data.

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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...

Geocoding vehicle collisions on Korean expressways based on postmile referencing

Park, Shin Hyoung
Bigham, John M.
Kho, Seung-Young
Kang, Seungmo
Kim, Dong-Kyu
2011

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....

Transportation Injury Mapping System (TIMS)

Transportation Injury Mapping System (TIMS)

"Visualize and conduct your own traffic safety analysis" in dark blue text on a grey background with a data visualization to the right of Berkeley crashes

For over twenty years, the Transportation Injury Mapping System (TIMS) developed by UC Berkeley SafeTREC has enabled quick...

Safety Impacts of Vehicle Weight on Vulnerable Road Users

Safety Impacts of Vehicle Weight on Vulnerable Road Users
Research Team:

Matthew Raifman
Amalia Stahl
SangHyouk Oum


Funding Organization:

California Office of Traffic Safety (OTS)


Summary:

A person in a motorized wheelchair on a sidewalk in between a truck and SUVnd

(Photo...

Join the SafeTREC Team: position open for a Program Coordinator

October 6, 2025
Work with Us!

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.

Program...