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TxDOT Annual Traffic Counts: The Annual Average Daily Traffic Counts (AADT) are collected by Texas Department of Transportation (TxDOT) and comprise
the "On System" roadways defined as major highways and regionally significant arterials.
The AADT counts result from a mathematical computation where the counts are made over a given
period of time and the high and low counts are removed. The counts are done
during the non-summer weeks; excluding Fridays, Saturdays, Sundays, and
holidays. The AADT counts are what could be expected during a normal
workday of a given week. Also available on request is a table comprising counts
from 1990 to 2005.
The City of Austin (COA) collects vehicle volume counts on an "as needed basis." When a particular location needs a traffic study COA adds these counts to the City of Austin Traffic Counts spreadsheet. COA does studies to set the speed limit on new streets and to determine the need for school zones at various locations. The city does not collect any data on major highways within Austin. The method COA uses to collect the counts is the rubber tube stretched across the road that attaches to a traffic counter. These counters have circuit boards that give multiple types of counts including the volume counts used on the spreadsheet. COA continues to add counts to the spreadsheet daily and CAMPO updates the website on a regular basis to keep it as current as possible. Jerry Carden (512-974-5625) is the contact person for questions for these counts.
The approximately 3,500 Saturation Counts are collected by Texas Department of Transportation (TxDOT) and comprise "Off System" roadways such as arterials and local streets not incuded in the AADT "On System" counts. Saturation counts are done periodically on a regional basis and the time frame will vary by region. The data is usually collected in the spring while school is still in session. The counts are 24 hour weekday (Monday thru Thursday) axles divided by two. The data is then compiled and usually released for use about one year after initial collection, usually in August or September the following year. The data for the 2010 maps was collected in the Spring of 2010 and the maps were released for use in the Fall of 2011. Counts from 2005 and earlier are available upon request. Notes: Files are large and will take a minute or two to load. Labels for counts are very small so use your browser's zoom/enlarge function to view. - Next updates for the TxDOT counts will be Fall 2012 for the 2011 AADT counts. City of Austin counts are updated when available.
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TxDOT 5 County AADT Counts Map - 2006 (1.3 MB)
