California Department of Transportation

The publications and reports on this site that are labeled .pdf (portable document format) require Adobe Acrobat Reader to view them. The software can be downloaded free from Adobe's web site (one-time setup).

Click on the link below to go to the site. Adobe logo


Welcome to Traffic Census

Traffic Counts

TRAFFIC COUNTS, also called Traffic Volumes, are available in various formats, and are only for the State Highway System.

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

Traffic count information for city and county streets may be found at the following links. Click HERE for city traffic volume information. County traffic volume information is available at the County Public Works Department, or the Community Development Office in the area where the street is located.

Explanatory Diagram of Traffic Counts (.pdf)

Caltrans traffic counts are summarized annually into four categories: 

1.  Traffic Volumes (Annual Average Daily Traffic (AADT)) for all vehicles on California State Highways: 2013, 2012, 2011
      PDF format: 2013, **2012, **2011, **2010, **2009, 2008, 2007, 2006, 2005, 2004, 2003, 2002, 2001, 2000, 1999, 1998, 1997, 1996, 1995, 1994, 1993
      Excel format: 2013, 2012, 2011, 2008, 2007, 2006, 2005, 2004, 2003, 2002, 2001
        **An error was reported on the Traffic Volumes on California State Highways Years 2009, 2010, 2011, and 2012.  Located in the Preface (Page ii), Traffic Trend on Year 2008 over 2007 reads +3.5%. 
        Instead, this number should be reported as -3.5%.

2.  Truck Traffic (Annual Average Daily Truck Traffic on California State Highways).
      PDF format: 2013, 2012, 2011, 2010, 2009, 2008, 2007, 2006, 2005, 2004, 2003, 2002
      Word format: 2012, 2011
      Excel format: 2013, 2012, 2011, 2010, 2007, 2006, 2005, 2004, 2003, 2002, 2001, 2000, 1998, 1995, 1994, 1993

3.  Ramp Volumes on California State Freeways. For downloadable PDF files (organized by Caltrans Districts 1 through 12), click on the following link: 2013, 2012

4.  Peak Hour Volume Data consists of 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 Annual Average Daily Traffic (AADT).
      PDF format: 2013, 2012, 2011, 2010

For questions regarding AADT reports, Ramp Volumes, or the Peak Hour Volume Data Reports above, please contact:, or (916) 654-4578.

For questions regarding Truck AADT, please contact Diana Tham:, or (916) 654-4707.

Traffic Volumes and Truck AADT are also available for a nominal fee in hard copy format from Caltrans Publications office at (916) 263-0822. To order on-line, or by mail or fax, go to

For AADT GIS data, visit the GIS Data Library, Highway Section: (DRISI website)


Monthly Vehicle Miles of Travel

The Traffic Data Branch produces a Monthly Vehicle Miles of Travel (MVMT) report (often called the "Trend" report). This report estimates the number of vehicle miles that motorists traveled on California State Highways using a sampling of up to 20 traffic monitoring sites. Various roadway types are used to calculate VMT.

Historical Monthly VMT(.pdf) - Lists monthly/annual statewide Vehicle Miles Traveled (VMT) on State Highways for the past 42 years. 1972-2014.

Historical Monthly VMT (Excel version)

For information regarding the monthly trend reports, please contact:


* For travel reports, surveys, and forecast documents, especially related to fuel consumption, Commercial Truck VMT, and VMT data per capita, please contact another area of Caltrans:

Caltrans Division of Research, innovation, and System Information Data Library