Define the following terms and cite examples of how they are used.
- Average annual daily traffic (AADT)
- Average daily traffic (ADT)
- Vehicle-miles of travel (VMT)
- Peak hour volume (PHV)
What will be an ideal response?
Average annual daily traffic (AADT) is the average of 24-hour traffic counts collected every day in the year. These counts are used to estimate highway user revenues, compute accident rates, and establish traffic volume trends.
Average daily traffic (ADT) is the average of 24-hour traffic counts collected over a number of days greater than one but less than a year. These counts are used for planning of highway activities, measuring current traffic demand, and evaluating existing traffic flow.
Vehicle miles of travel (VMT) is a measure of travel usage along a section of road. It is the product of the volume (ADT) and the length of roadway in miles to which the volume is applicable. This measure is used mainly as a base for allocating resources for maintenance and improvement of highways and to establish highway system usage trends.
Peak hour volume (PHV) is the maximum number of vehicles that pass a point on a highway during a period of sixty consecutive minutes. This volume is used for functional classification of highways, geometric design standards selection, capacity analysis, development of operational programs, and development of parking regulations.
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