Average-mean speed

The Average Speed option in the Output fields section of the Traffic Analytics query criteria is the arithmetic mean of all the vehicle speed observations on a specific road segment in this epoch. This is in kph, with one decimal place. In the query results file, the average speed is the MEAN.

HERE collects probes from different types of vehicles, and when a single road segment sees multiple probes in a single epoch, it averages their speeds together to provide a mean speed for that epoch. If some vehicles spend more time than others on that road segment in that epoch, or if some of those vehicles produce probe points more frequently than others, then each vehicle doesn't have the same impact on the mean speed as the others.