A safety sensor and warning system, for use in combination with a motor vehicle, has sensors for determining if personnel are present in one or more predetermined danger zones proximate to the vehicle, during times when the vehicle is undergoing the loading and/or unloading of personnel; if the presence...http://www.google.fr/patents/US5281949?utm_source=gb-gplus-shareBrevet US5281949 - Vehicular safety sensor and warning system
