Annual Average Daily Traffic (AADT)

Annual Average Daily Traffic (AADT) volume is used throughout the project planning process to provide projected future traffic volumes. It is based on a 24-hour, two-directional count at a given location. The raw traffic data is mathematically adjusted for vehicle type, determined by an axle correction factor. The data is then statistically corrected by a seasonal variation factor that considers time of year and day of the week.

To view traffic history by Station County Location Number, go to Once on the traffic history site, select the county name (yellow box at top of screen), enter the station number, and click “Search.”

To view traffic history by county and roadway, select the yearly report from the books below. (Adobe Acrobat Reader required)

2013 AADT by County
2000 AADT Book 2001 AADT Book 2002 AADT Book 2003 AADT Book
2004 AADT Book 2005 AADT Book 2006 AADT Book 2007 AADT Book
2008 AADT Book 2009 AADT Book 2010 AADT Book 2011 AADT Book
2012 AADT Book 2013 AADT Book