Office of Highway System Information and Performance (OHSIP)

Our office collects and analyzes report statistics related to the fiscal status, physical and geometric extent, performance, and designation of the State's roadway systems. This enables decision makers and system users to take advantage of quality transportation information to make performance-based decisions about transportation services and infrastructure.

Mandy Chu, Office Chief
Email Mandy Chu
(916) 654-3995

What We Do

  • Public roads functional classification and designation approvals
  • Coordinate State roadways, structures, and appurtenances official names
  • Work with Local Agencies to adjust Census designated urban boundaries
  • Maintain the official California Road System (CRS) maps
  • 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
  • Maintain the Traffic Accident Surveillance and Analysis System (TASAS) database

OHSIP Branches

Highway Performance Monitoring System (HPMS)

Eric Y. Wong, Chief
Email Eric Wong
(916) 654-6839

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.

  • 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‚Äźdefined 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.
  • HPMS Data Library
    The Highway Performance Monitoring System (HPMS) is a continuing, sample-based monitoring program that requires annual data reporting instead of biennial special studies.
  • California Public Road Data
    The publications, California Public Road Data, contain statistical information derived from the Highway Performance Monitoring System (HPMS).
  • Caltrans All Roads Linear Reference System (LRS) Fact Sheet
    The Federal Highway Administration requires State Departments of Transportation to develop and submit a linear referencing system (LRS) network for all public roads in their respective states, known as the All Roads Network of Linear Referenced Data (ARNOLD). This requirement is an integral part of each state's federally mandated Highway Performance Monitoring System (HPMS) annual submittal.

Traffic Accident Surveillance and Analysis System (TASAS)

Aaron Truong, Chief
Email Aaron Truong
(916) 651-5719

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 accident data allows the Department to generate reports that identify locations with significantly high accident 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.

  • Highway Sequence Listing
    Highway Sequence Listing lists all current highway segments, intersections and ramps by district, county, route and postmile and is published annually. The following information is provided in the report: 
    • Location: District, route, county, city, and postmile
    • Highway group and facility type
    • Highway segment length
    • Description of bridges, intersections, and ramps
  • Annual Collision Data on California State Highways
    • This report presents annual collision 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, accidents, victims, rates, and fatalities. Additional data include trend data, data by district, basic average accident rates, accident data by date or hour, and by type of collision.
  • Place Name Publication
    • The name report is prepared as a ready reference to places shown on the California System (CRS) maps. 
  • Name Freeway 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.