Abstract: A guidance system for guiding a plurality of unmanned vehicles along a traffic layout includes a plurality of code devices which divide the traffic layout into a plurality of zones and identify each zone by a unique identifying code. Each vehicle includes control circuits having code sensors which sense the identifying code as the vehicle enters a zone and provide data to a present memory which stores present address data representing the identity of the zone in which the vehicle is now traveling. A past memory, which receives data from the present memory, stores past address data representing the identity of the zone in which the vehicle was previously traveling. The control circuits further include a time slot generator which provides timing signals defining a plurality of time slots each of which is assigned to a different zone.