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Office of Highway System Information and Performance

The Office of Highway System Information and Performance collects, manages, and maintains the Highway Performance Monitoring System (HPMS) and Transportation System Network (TSN) data systems. OHSIP provides transportation data from HPMS and TSN to state and federal legislators, the Governor’s office, and FHWA for determining transportation funding for California Highway System and meeting federal mandates.

HPMS and 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.

Aaron Troung, Office Chief

What We Do

  • Maintain and manage public roads functional classification and designation approvals processes
  • Coordinate with Caltrans Legislative Affairs to update and manage state roadways, structures, and appurtenances official names
  • Collaborate with FHWA and Local Agencies to adjust Census designated urban boundaries
  • Manage and maintain the official California Road System (CRS) maps
  • Manage and maintain the Federally mandated Highway Performance Monitoring System (HPMS) condition and performance data
  • Officially certify the annual Maintained Mileage Report of public road mileage for the State
  • 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

Highway Performance Monitoring System (HPMS)

Hoang Pham, Branch Chief
Email Hoang Pham

The Highway Performance Monitoring System (HPMS) is a federally mandated inventory system and planning tool, designed by FHWA to assess the nation's highway system. HPMS was created in 1978 as a continuing, sample-based monitoring program that requires annual data reporting instead of biennial special studies. The HPMS Branch provides information to State and Federal Legislators necessary to ensure the connectivity, integrity, continuity, and functionality of the highway system and of the California Road System (CRS). We provide data to the Governor's office, the State Legislators, and the Federal Highway Administration in order to secure transportation funding for California's highways. Accurate, complete, and reliable information is provided to decision makers in the Federal Government, State Legislature, the Governor's office, and to other government agencies. We maintain the connectivity, functionality, integrity, numbering system, and naming of the State Highway System. We assist in meeting Federal funding requirements. We work towards the safe, expeditious, and efficient transportation of goods, services, and the traveling public across, through, and within California. Caltrans improves mobility across California using our data.

  • Functional Classification
    The Federal Highway Administration [FHWA) identifies functional classification as a key item in transportation data. Streets and highways are grouped into classes according to the service they provide. The California Road System (CRS maps) on this web site display functional classification which is used in determining Federal funding to maintain the roads. The FHWA stamp of approval is in the lower left corner of each CRS map (PDF), which makes it the official functional classification.
  • California Road System (CRS) Maps
    The California Road System (CRS) maps display functional classification which is used in determining Federal funding to maintain the roads. The FHWA stamp of approval is in the lower left corner of each CRS map (PDF), which makes the functional classification official.
  • National Highway System (NHS)
    The NHS consists of roadways important to the nation’s economy, defense, and mobility.
  • Adjusted Urban Areas
    Federal transportation legislation allows for the expansion of the Census‐defined urban areas for transportation planning purposes. The adjustment process is completed through the cooperative efforts of State and local officials and approved by the Federal Highway Administration (FHWA). The Adjusted Urban Area Maps are the result of this process.
  • California Public Road Data
    The publications, California Public Road Data, contain statistical information derived from the Highway Performance Monitoring System (HPMS).

Traffic Accident Surveillance and Analysis System (TASAS)

Caroline Chen, Branch Chief
Email Caroline Chen

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.

  • 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

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