California Department of Transportation

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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 TRAFFIC COUNTS in various formats (the link above is for the most current online searchable format), and only on the State Highway System.

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

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.

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: 2006, 2007, 2008 .

2.  Truck Traffic (Annual Average Daily Truck Traffic) on Calif. State Hwys. For a downloadable format in pdf, click on the following: 2008.pdf.

For those with accessibility needs, the 2007 Truck report is also available in .doc format: 2008Truckdoc.

3.  Ramp Volumes on California State Freeways. For an on-line search, click on the following: 2008.

The information may also be downloaded from this site as Excel Files.

2008AADT,

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

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.

 

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).

 

 

The Traffic Data Branch also produces a monthly Vehicle Miles of Travel (VMT) report (also called the "Trend" report).  This report estimates the number of vehicle miles that motorists traveled on California State Highways.  A sample of up to 22 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 posted at the end of February).

Additional Vehicle Miles of Travel reports available on this site:

Historical Monthly VMT(.pdf) - Lists monthly statewide VMT on State Highways.  Years 1972-2008.

Historical Monthly VMT (Excel version)

County Vehicle Miles of Travel(.pdf) - Lists VMT on State Highways by County.  Years 1990-2008.

County Vehicle Miles of Travel (Excel version)

For more information on any of the above reports or for any additional data requests, please call: (916) 654-6939.

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For even more travel reports, surveys, and forecast documents from another area of Caltrans:

The Division of Transportation Systems Information

click on the link below to access their web page:

Caltrans Division of Transportation Systems Information