Automatic guided vehicle collision prevention system

An automated vehicle protection system is provided comprising a guideway 20, a vehicle 10, a guideway loop antenna 21, and transponders 41a, 41b, mounted on the vehicle 10. Means 24, 25 are provided, coupled to the guideway loop antenna 21, for receiving a signal from the vehicle 10 and generating an inhibit signal in order to inhibit vehicle movement in a section of the guideway 20. The inhibit signal may be passed to a circuit associated with another guideway loop antenna 22, 23, to control transmission of a signal from this other guideway loop antenna 22, 23.