Caltrans GIS Data


California Road System - Unofficial Functional Classification

The California Road System (CRS Maps) are updated continuously, however, the GIS Data Library is only updated quarterly. As a result, this geodatabase may not have the most current data (see Disclaimer below).

Last Modified: September 15, 2017


Functional classification is the process by which streets and highways are grouped into classes, or systems, according to the character of service they are intended to provide. Basic to this process is the recognition that individual roads and streets do not serve travel independently in any major way. Rather, most travel involves movement through a network of roads. It becomes necessary then to determine how this travel can be channelized within the network in a logical and efficient manner. Functional classification defines the nature of this channelization process by defining the part that any particular road or street should play in serving the flow of trips through a highway network. For more information, please see website


The California Department of Transportation makes no representation or warranties regarding the accuracy of this GIS data. Many agencies update their jurisdictions frequently and this geodatabase may not have the most recent data available. This geodatabase is provided as a courtesy, however, the function classification field is unofficial and should only be used as a cross-reference. The only official functional classification for Federal Aid Funding can be found on the California Road System (CRS Maps) displayed on the website below. The FHWA stamp of approval is in the lower left corner of each CRS map (PDF), which makes it the official functional classification:


Tags: California Road System, Unofficial Functional Classification
Credits: California Department of Transportation
Files: Please complete the Disclaimer Form , and return it to the GIS Data Librarian at email address Then the Librarian will give you a FTP address and password to download GIS files. The 2016 January road release data are organized by Caltrans districts in file geodatabase format. The total size of 12 zipped files is about 345 MB. The CRS map grid GIS file can be downloaded from the same FTP site.
Extent: California Statewide, data are organized by 12 Caltrans districts
References: The official functional classification: