Method and system for limiting vehicle speed and/or estimating the vertical load on a vehicle

Method in which the loading of a vehicle is measured and used to determine the vehicle weight. The weight is then used by the vehicle management system to limit the top speed. If necessary the vehicle can be prevented from moving. An Independent claim is made for a system for limiting vehicle speed depending on its loading. System has tire sensors and an analysis system for determining the loading. The sensors comprise magnetic signal generators (102, 103) incorporated in the tires and associated signal recorders (104, 105) placed on the vehicle bodywork. An analysis unit (6) determines loading by comparison of the measured phase difference with a reference phase difference. The loading value is used by a vehicle control system (108).