Traffic Census Program

Traffic Counts (a.k.a. Traffic Volumes) are for the State Highway System only (in various formats).

Highways are signed as Interstate, California State Route, or United States Route. See examples below:

interstate route shield   state route shield   US route shield

Traffic count information for city and county streets may be found at the city Traffic Engineering or Public Works Department, or the Community Development Office in the area where the street is located.


Caltrans Traffic Counts are summarized annually into four categories:

Traffic Volumes: Annual Average Daily Traffic (AADT)

For ALL vehicles on California State Highways.

by Webpage:  2017

by PDF: 2016-AADT (PDF) | 2015-AADT (PDF) | 2014-AADT (PDF) | 2013-AADT (PDF)

by Excel: 2018-AADT (XLSX) | 2017-AADT (XLSX) | 2016-AADT (XLSX) | 2015-AADT (XLSX) | 2014 -AADT(XLSX) | 2013-AADT (XLSX) 

Note: Only Excel format available from 2017 to current year.  

Truck Traffic: Annual Average Daily Truck Traffic

For truck traffic on California State Highways.

by PDF:  2016-AADT Truck (PDF) | 2015-AADT Truck (PDF)  | 2014-AADT Truck (PDF) | 2013-AADT Truck (PDF)

by Excel: 2018-AADT Truck (XLSX) | 2017-AADT Truck (XLSX) | 2016-AADT Truck (XLSX) | 2015-AADT Truck (XLSX) | 2014-AADT Truck (XLSX) | 2013-AADT Truck (XLSX)

Note: Only Excel format available from 2017 to current year.  


Ramp Volumes

For ramp volumes on California State Freeways, by Caltrans District.

  • Legend of District County Names (JPG)
by PDF:
by Excel:

Peak Hour Volume Data

Hourly volume relationships and traffic monitoring sites on the State Highway System.
Morning (AM) and evening (PM) peak periods are expressed as a percentage of AADT.

by Year:  2017 (PDF) | 2017 (XLSX) | 2016 (PDF)2016 (XLSX) | 2015 (PDF) | 2015 (XLSX) | 2014 (XLSX)

For questions regarding AADT reports, Ramp Volumes, or the Peak Hour Volume Data Reports above, please contact: Cindy.Pribyl@dot.ca.gov.

For AADT GIS data, visit the Caltrans GIS Data webpage.