A system, a method and device for controlling speed of a moving vehicle, using portable and repositionable global positioning devices, speed limit processors, and a database of legal vehicle speed limits is in communication with the speed limit processor. Computer instructions instruct the speed limit processor to match the current location of the moving vehicle with a legal vehicle speed limit for a defined location using the database. The speed limit processor communicates the legal vehicle speed limit to the vehicle processor to control the speed of the moving vehicle.