Office of Highway System Information and Performance (OHSIP)

Photo of ODST 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 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; 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. .

  • 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.More on 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.
    CRS Maps Web Application

  • 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.More on Adjusted Urban Areas

  • 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.


Brian Domsic, Chief
Email Brian Domsic

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