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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:
For the most current downloadable format in pdf, click on the following: 2011 Traffic Volumes Book
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.
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
2010Truck, 2009Truck, 2008Truck, 2007Truck,
2006Truck, 2005Truck, 2004Truck, 2003Truck, 2002Truck, 2001Truck, 2000Truck (revised),1998Truck, 1997Truck, 1996Truck, 1995Truck, 1994Truck, 1993Truck, 1992Truck
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.
For additional information not found here,
contact The Traffic Data Branch:
* 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: