Sélection de route pour véhicule routier et système de guidage

Beacons distributed over a designated geographical area broadcasting route guidance information to passing vehicles, and one or more vehicles each equipped with the compass, odometer, computer including display and data entry means, a receiver for receiving information from a beacon, the information being presented in the form of nodes and route links between the nodes, where the information is relatively detailed in a first area immediately surrounding the beacon, and the information is relatively sparse in second areas further away than the first area and nodes are defined in terms of a hierarchical code (as herein defined) of the form wherein nodes in said second areas are defined in terms of code elements Di and nodes in said first area in terms of code elements Di+j, and where the intended destination is entered into said computer by said data entry means in terms of an identifying hierarchical code.