Description: 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.
Description: 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.