| 摘要 |
A lower plane has several small part zones of fine mesh density assigned to it. One or more large part zones with a coarse mesh density are assigned to a higher plane. Beginning with the lower plane the road system is scanned for a possible travel route, and following negative results over a period of time passes over to the next higher plane, until a positive result is obtained, and then the travel route is established within the same plane or by combining up and down between the planes. All roads which can be travelled are arranged within the lower plane and the higher plane contains only those roads, which join the part zones of the lower or next lower plane. A computer (10) is provided with storages (12,14) and indicating and operating units for at least two planes of different mesh density and zone sizes of the road system. An input-output unit (16) is also provided.
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