Tutorial Average Speed

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Space-Mean Speed Space-Mean Speed is the average speed of all vehicles occupying a given section of roadway over a specified time (essentially, the inverse of travel time for all vehicles over the specified section length) and is calculated from the Link_Lane_Detector output file to match the vehcle-hours traveled (Column F) given in the LinkResults output file. Space-Mean Speed is then calculated by

$$S=\frac{VMT}{VHT}$$

where

Time-Mean Speed Time-Mean Speed is the average speed of all vehicles passing a point on a roadway over a specified time (instantaneous point speed, as taken by a radar gun for example) and is calculated from the Link_Lane_Detector output file. Time-Mean Speed is then calculated by

$$S=\frac{1}{N} \sum_{i=1}^\N\ u_{i}$$

where