Office of Highway System Information and Performance (OHSIP)

ODST Acting Chief, Mandy Chu
Email Mandy Chu
(916) 654-3995

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.

What We Do

  • Public roads functional classification and designation approvals;
  • Coordinate State roadways, structures, and appurtenances official names;
  • Work with Local Agencies to manage urban/rural designations;
  • 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; and
  • Maintain the Traffic Accident Surveillance and Analysis System (TASAS) database.

OHSIP Branches


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

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. Some of our work:

  • National Highway System (NHS)

    The NHS consists of approximanately 160,000 miles of rural and urban roads nationwide, serving major population centers, international border crossing, intermodal transportation facilities, and major travel destinations. The NHS includes the following:

    • Interstate System

      The Federal-Aid Highway Act of 1956 established the Interstate Highway System, which includes more than 46,500 miles of interconnected highways. Most of the nation’s business and pleasure travel involves Interstate Highways at some point.

    • Principal Arterials

      Rural highways that provide corridor movements having characteristics similar to statewide or interstate travel, and Urban roadways that carry a major portion of trips entering and leaving urban areas or roadways or carry the major portion of through movements to bypass the central cities.

    • Intermodal Connectors

      Highways that provide motor vehicle access between the NHS and major intermodal transportation facilities.

    • Strategic Highway Network (STRAHNET)

      STRAHNET is a nationwide system of highways within the NHS that are designated to transport personnel and equipment in emergencies. The STRAHNET designation was created, and is administered, by the U.S. Department of Defense.

    • Strategic Highway Network (STRAHNET) Connectors

      STRAHNET Connectors are a sub-system of “connectors” on State highways and local roads for movement primarily into water ports and military installations.

  • Functional Classification

    Functional Classification is a key designation for transportation data, grouping streets and highways into classes according to the service they provide. These classifications are used by FHWA in determining Federal funding.

    • California Road System (CRS) Maps

      CRS Maps display the official FHWA approved functional classification of each road. The FHWA stamp of approval is found in the lower left corner of each map.

    • Functional Classification Procedures

      Functional Classification is important to FHWA, Caltrans, and Local Agencies. Caltrans works with Local Agencies to upgrade official designations when applicable. Some helpful documents we provide:

      • Flowchart to change the Functional Classification
      • Example of a Submittal Package
      • Blank form for a submittal
      • FHWA Functional Classification Guidelines (FHWA Website)
      • Log of Functional Classification Changes Received/Approved
      • List of Functional Classification Coordinators


Brian Domsic, Chief
Email Brian Domsic

  • TSN Database - TASAS Accident Reporting

    Our team maintains accident data in the TSN database for all collisions on or associated with a State highway facility.

    More information about TSN...

    Combining the highway inventory with accident data allows the Department to generate quarterly reports that identify locations with significantly high accident concentrations.  TASAS can also generate Accident Rate report or Selective Accident Retrieval report that provides detailed listing of accidents for selective location (District-County-Route-Postmile) and time period.

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12-14-17