Description: This file represents linework based on the TSN database, including relinquishments, as of December 31, 2017. There were significant changes to 6 state routes, along with other minor changes.
Copyright Text: California State Department of Transportation
Description: To create a GIS layer of the California highway system, this file was created using the 2009 Census TIGER roads file. From the 2009 TIGER data, highways were extracted and modified using BING imagery and street maps from the ESRI base map extension. The source for these modifications are from the Transportation System Network (TSN) database that is obtained and managed by the California Department of Transportation (Caltrans) Traffic Accident Surveillance and Analysis System (TASAS) branch.The highways in this file reflect what was in the TSN database as of January 30, 2008.
Copyright Text: California Department of Transportation