A traffic monitoring system comprises a cellular phone system that communicates with a plurality of cellular phones and that generates vector and location data for the plurality of cellular phones. A traffic monitoring module generates traffic reports based on the vector and location data and selectively enables use of the vector and location data from at least one of the cellular phones when at least one of a speed of the at least one of the cellular phones is greater than a predetermined speed and the traffic monitoring module receives vector and location data from a second one of the cellular phones and the second one of the cellular phones is traveling in the same or an opposite direction as the first one of the cellular phones and has a speed that is within a predetermined difference of a speed of the first one of the cellular phones.