software holds cell phone calls while you drive

A Canadian company developed a software that will hold incoming calls during your drive. Required implementation is rather straightforward. Using the cellular network structure, the approximate location of the driver can be found. After that, you pick a time granularity (minute?) and do the math. If in the first minute the driver's on location X and in the second he's on location Y,then
distance(X, Y)/1 > driving_speed_threshold
will tell you if the driver is on the move. Notice that "1" stands for the difference between time.

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