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Caltrans > Business > Traffic Counts
 

Welcome to the Traffic Data Branch

The Traffic Data Branch is responsible for the collection and dissemination of historical volume and speed data. TRAFFIC COUNTS, also called Traffic Volumes, are available in various formats, and are only for the State Highway System. We do not collect traffic counts on locally maintained streets.

State Highways are signed Interstate, California, and the US. Examples are pictured below:

Although we do not collect traffic count information on locally maintained streets, links to that information are provided here as a courtesy. Most local data is available from the City or County Public Works Department, Traffic Engineers office, in the area where the street is located.

Caltrans traffic counts are summarized annually into three categories. 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 online search by route, click on one of the following: 2008, 2009, 2010, 2011.

For the most current downloadable format in pdf, click on the following: 2011 Traffic Volumes Book

2.  Truck Traffic (Annual Average Daily Truck Traffic) on Calif. State Hwys. For a downloadable format in pdf, click on the following: 2010.pdf or 2011.pdf.

For those with accessibility needs, the 2011 Truck report is also available in .doc format: 2011Truckdoc.

3.  Ramp Volumes on California State Freeways. For downloadable pdf files (organized by Caltrans Districts 1 through 12), click on the following link: 2011.

 

Some of the AADT reports on this site may also be downloaded as Excel Files (below).

 

2011AADT, 2010AADT, 2009AADT,

2008AADT, 2007AADT, 2006AADT, 2005AADT, 2004AADT, 2003AADT, 2002AADT 2001AADT, 2000AADT, 1999AADT, 1998AADT, 1997AADT, 1996AADT, 1995AADT, 1994AADT,1993AADT, 1992AADT


The 2011 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).

Peak Hour reports for previous years are also available: 2010, 2009, 2008, 2007

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

2011Truck,

2010Truck, 2009Truck, 2008Truck, 2007Truck,
2006Truck, 2005Truck, 2004Truck, 2003Truck, 2002Truck, 2001Truck, 2000Truck (revised),1998Truck, 1997Truck, 1996Truck, 1995Truck, 1994Truck, 1993Truck, 1992Truck

Some of these publications are also available for a nominal fee in hard copy format from Caltrans Publications office at (916) 263-0822, or (916) 263-0865. To order on-line, or by mail or fax, go to http://caltrans-opac.ca.gov/publicat.htm.

 


For questions regarding Truck AADT reports, please contact: Binoy.Alexander@dot.ca.gov


The Traffic Data Unit provides historical data, normally in total volumes, VMT (Vehicle Miles traveled), Annual Average Daily Traffic (AADT), and some historical speed data reports.

* For more specific reports, surveys, forecast documents, especially related to fuel consumption, Commercial Truck VMT, and VMT data per capita, for example, please use the link at the bottom of this page to connect to another Caltrans Division, Research, Innovation and System Information (DRISI).

 

 

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 using a sampling of up to 20 traffic monitoring sites. Various roadway types are used to calculate VMT.


For information regarding the monthly trend reports or historical speed data, please contact: Viki.Duncan@dot.ca.gov

 

Additional Vehicle Miles of Travel reports available on this site:

Historical Monthly VMT(.pdf) - Lists monthly/annual statewide Vehicle Miles Traveled (VMT) on State Highways for the past 40 years.  1972-2012.

Historical Monthly VMT (Excel version)

For additional information not found here,
contact The Traffic Data Branch:

Viki.Duncan@dot.ca.gov

 

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* For even more 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:

The Division of Research, Innovation, and
System Information (DRISI)

click on the link below to access their web page and use their search box to narrow down the data or reports you'd like:

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