Systems and methods to determine a speed limit violation by a vehicle. A locator device coupled to the vehicle receives GPS location coordinates from a satellite. The systems and methods determine the speed of the vehicle using the received coordinates or the functions of an engine control module. The speed limit of the segment of roadway on which the vehicle is traveling is identified based on the coordinates, and the vehicle speed is compared to the speed limit to determine whether the vehicle is violating the speed limit for the segment of roadway. The systems and methods alert any interested parties, such as the vehicle driver or a fleet manager, of the speed limit violation.