The traffic control centre of the ariadne route-guidance system composes for every instrumented intersection a message which contains coded routing information for the driver. This message, the "codegram" contains information about: (1) the possible routes a driver can choose at the intersection, (2) the physical structure of the intersection, and (3) the weather conditions, road conditions, road blocks, etc. The processor in the car extracts from this "codegram" a direction advice (according to the destination code and aided by the driver) and displays routing instruction(s) on a visual display unit. This report describes a possible layout for the visual display unit, the coding of the routing information (the codegram) and the decoding of the message received from the roadside unit by the processor in the car. (Author/publisher)
Abstract