Office of Highway System Information and Performance
The Office of Highway System Information and Performance collects, manages, and maintains the Transportation System Network (TSN) data systems. OHSIP provides transportation data from TSN to state and federal legislators, the Governor’s office, and FHWA for determining transportation funding for California Highway System and meeting federal mandates.
TSN data also enable decision makers and system users to take advantage of quality transportation information to make performance-based decisions about transportation services, infrastructure, and highway safety improvement projects.
What We Do
- Coordinate with Caltrans Legislative Affairs to update and manage state roadways, structures, and appurtenances official names
- Collect State Highway System roadway inventory data and maintain the Transportation System Network (TSN) / Traffic Accident Surveillance and Analysis System (TASAS) database
- Lead the Transportation System Network Replacement (TSNR) and Model Inventory Roadway Elements (MIRE) data collection projects
Office of Highway System Information and Performance Branches
Traffic Accident Surveillance and Analysis System (TASAS)
Benson Liang, Branch Chief
Email Benson Liang
The TASAS Branch maintains the highway inventory database as part of the Transportation System Network application, which contains the current and historical description of over 15,000 ramps, 17,000 intersections and 15,000 miles of highways in the State Highway System (SHS). The inventory data (e.g. district, county, route, post mile, number of lanes, geometric attributes of lanes, shoulders, medians, intersections and ramps) are being continuously maintained and updated on a daily basis. Combining the highway inventory with crash data allows the Department to generate reports that identify locations with significantly high crash concentrations for further safety analysis and investigation.
The TASAS Branch also maintain and provide highway system engineering data to State and Federal Legislators necessary to ensure the connectivity, integrity, continuity, and functionality of the SHS and of the California Road System (CRS). We provide also data to the Governor's office, the State Legislators, and the Federal Highway Administration in order to secure transportation funding for California's highways.
- Annual Crash Data on California State Highways
- This report presents annual crash data on California State Highways and which is summarized by urban, rural, and districtwide or countywide according to the following categories: lane type, road miles travel, crashes, victims, rates, and fatalities. Additional data include trend data, data by district, basic average crash rates, crash data by date or hour, and by type of crash.
- This report presents annual crash data on California State Highways and which is summarized by urban, rural, and districtwide or countywide according to the following categories: lane type, road miles travel, crashes, victims, rates, and fatalities. Additional data include trend data, data by district, basic average crash rates, crash data by date or hour, and by type of crash.
- Place Names in California Publication
Based on overall low usage results from the Place Names Publication Survey and the online availability of the data presented in Place Names in California, this publication has been discontinued as of the 2020 edition. The 2020 publication will no longer be available after January 2025. - Named Freeways, Highways, Structures and Other Appurtenances in California Publication
Named Freeways, Highways, Structures and Other Appurtenances in California are shown in the Name Freeway Publication as a reference to the many named facilities that are part of the California State Highway System. This publication provides information on officially named freeways; highways; structures such as bridges, tunnels, and interchanges; Blue Star Memorial Highways; Safety Roadside Rest Areas; and memorial plaques.
- Traversable Highway Publication
- Traversable Highway report provides a listing and status of all traversable highways, which are routes that have been adopted by Legislation as future State Highway Route, but not yet by California Transportation Commission (CTC). These routes when constructed to the Department of Transportation (Caltrans) standards, CTC shall adopt them as State Highways and Caltrans must maintain them.
- Traversable Highways 2013