A system and method for determining the flow of traffic in a monitored
route segment using global positioning system, or assisted global
positioning system, enabled cellular phones as traffic probes takes
advantage of the existing cellular infrastructure to deploy traffic
probes to determine the flow of traffic based on the speed and direction
of probes. Filtering of probe data can be used to remove probes having
outlying results such as excessive speed, or probes that do not fit the
general trend already observed on a traffic route segment.