Abstract: Control apparatus for guiding one or more vehicles along a closed transport system having a plurality of routes and a plurality of junctions each allowing a choice of two directions. The system is illustrated as comprising a number of interconnected sub-systems or networks. Each junction has associated therewith a transmitter which sends out a coded signal comprising at least two words, one of which indicates the direction to be taken from the junction to reach the different networks and also indicates the networks which the paths from the junction lead to. The second word does likewise for the route segments of the network or networks to which the paths from the junction lead. A like destination code is stored in the vehicle, and the vehicle compares the stored code and the successive received codes and obeys the word instructions from each successive junction till it arrives at the destination network.