Traffic Counts

Long Range Planning – AADT

(Annual Average Daily Traffic)

An AADT traffic volume is used throughout the project planning process to provide projected volumes of traffic.  It is based on a 24 hour, two directional count at a given location.  This raw traffic volume is then mathematically adjusted for vehicle type, determined by an axle correction factor.  Then this volume is statistically corrected by a seasonal variation factor that considers time of the year and day of the week.

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