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AADT:
Annual average daily traffic, total volume of vehicle traffic of a highway or road for a year divided by 365 days.
For the radar this is calculated as, total vehicle count divided by total number of days of data (minute accuracy).85th Percentile Speed:
85% of all vehicles travel at or below this speed, the remaining 15% travel faster.To calculate this speed, the software sorts all vehicles in increasing order by speed, finds the 85th percentile vehicle by count (e.g. 85th vehicle in this sorted list if there were 100 total vehicles). The speed of this vehicle is the 85th percentile speed of this data set.
The user can also filter the data to include only “Free floating vehicles” (i.e. lead vehicle of a platoon) and exclude large vehicles. Some DOT standards require this to correctly calculate the 85th percentile speed for a road.
Volumes – weekly vehicle counts:
Average daily – Given for weekdays and full week from (8AM-9AM) and (5PM-6PM) and (all day).
So, 5 day AM peak would be the average amount of cars per day traveling at 8AM-9AM from Monday through Friday.Speeds, counts and total counts by hour:
Gives the 85th percentile for the hour, the amount of cars within the 85th percentile,
total cars counted, max speed, average speed over the limit, and percent of cars speeding.Average Speeder:
This is the average speed of cars that are traveling over the speed limit.
You will notice in rows that have no speeders this value is reported “NaN” as no data is available.
This column will never report a value below your set speed limit.% Speeders:
%Speeders = Speeding cars / Total cars
So if there were 10 cars and 3 of them were speeding = 30% speedersThe amount of speeding cars is not listed in the hourly report.
The number of speeders can be calculated as (%Speeders * Total Cnts) / 100
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