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.
Welcome to the Traffic Data Branch
The Traffic Data Branch is responsible for the collection and dissemination of TRAFFIC COUNTS (Traffic Volumes Book) in various formats, and only for the State Highway System. The Traffic Volumes Book is a large file and may take a few minutes to download.
State Highways are signed Interstate, California, and the US. Examples are pictured below:
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We do not collect traffic count information on locally maintained streets. That information is available from the City or County Public Works Department, Traffic Engineers office, in the area where the street is located.
If you are looking for data for local streets and roads, please use the City or County links provided as a courtesy above.
Our traffic counts are summarized annually into three publications. Necessary software to download .pdf files can be obtained for free by clicking on the desired link in the grey column on the right side of this page:
1. Traffic Volumes (Annual Average Daily Traffic (AADT)) for all vehicles on California State Hwys. For an on-line search by route, click on one of the following: 2008, 2009, 2010.
2. Truck Traffic (Annual Average Daily Truck Traffic) on Calif. State Hwys. For a downloadable format in pdf, click on the following: 2009.pdf or 2010.pdf.
For those with accessibility needs, the 2008 and 2009 Truck reports are also available in .doc format: 2008Truckdoc and 2009Truckdoc.
3. Ramp Volumes on California State Freeways. For an on-line search, click on the following: 2010.
2008AADT, 2007AADT, 2006AADT, 2005AADT, 2004AADT, 2003AADT, 2002AADT 2001AADT, 2000AADT, 1999AADT,
1998AADT, 1997AADT, 1996AADT, 1995AADT, 1994AADT,1993AADT, 1992AADT
The Peak Hour Volume Data Report (.pdf) consists of hourly volume relationships and traffic monitoring sites on the State highway system. Morning (AM) and afternoon/evening (PM) peak periods are expressed as a percentage of Annual Average Daily Traffic (AADT).
For questions regarding AADT reports, or the Peak Hour Volume Data Report above, please contact: jeani_rector@dot.ca.gov
2010Truck, 2009Truck, 2008Truck, 2007Truck,
2006Truck, 2005Truck, 2004Truck, 2003Truck, 2002Truck, 2001Truck, 2000Truck (revised),1998Truck, 1997Truck, 1996Truck, 1995Truck, 1994Truck, 1993Truck, 1992Truck
For questions regarding truck reports or Ramp Volumes, please contact: esther_esquivel@dot.ca.gov
The Traffic Data Branch also produces a monthly Vehicle Miles of Travel (VMT) report (often called the "Trend" report). This report estimates the number of vehicle miles that motorists traveled on California State Highways. A sample of up to 20 traffic monitoring sites comprising various roadway types are used to calculate VMT. The VMT report for any given month is generally available and posted to this site by the last week of the following month (for example, January's data is available at the end of February).
Year 2008: January, February, March, April, May, June, July, August, September, October, November, December.
Year 2009: January, February, March, April, May, June, July, August, September, October, November, December.
Year 2010: January, February, March, April, May, June, July, August, September, October, November, December.
Year 2011: January, February, March, April, May, June, July, August, September, October, November, December.
For information regarding the Monthly Trend Reports, please contact: viki_duncan@dot.ca.gov
Additional Vehicle Miles of Travel reports available on this site:
Historical Monthly VMT(.pdf) - Lists monthly statewide VMT on State Highways. Years 1972-2011.
Historical Monthly VMT (Excel version)
For more information or for any additional data requests,
please email the Traffic Data Unit Supervisor:
nicholas_compin@dot.ca.gov.
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For even more travel reports, surveys, and forecast documents, especially related to fuel consumption or VMT data per capita, please contact another area of Caltrans:
The Division of Transportation System Information
click on the link below to access their web page: