| 摘要 |
The system (1-7) for guiding vehicles on the road network relies on the instantaneous determination of the position of the vehicle, and the use of a database of information carried on board the vehicle which distinguishes the main road network and the secondary road network. This information is used in the determination of the optimum route to follow for a particular destination chosen from amongst a list of addresses. A real time indication is provided giving messages as to which road to follow in order to use a prescribed itinerary. The optimisation of the itinerary takes account of the speed of the vehicle on main roads and the speed of the vehicle on secondary roads. Directional signalling is provided by devices implanted in the main roads. The information provides indicates the direction to be taken, and the distance to the destination as the crow flies.
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