| 摘要 |
A car navigation device sequentially selects one of the non-guidance intersections along the navigational route to the destination, and decides whether there is LXD data which show permitted directions to leave the intersection on entering it from each entrance lane in the entrance road. If the LXD data exist, then if there is a plurality of A-entrance lanes which is permitted to leave the intersection along roughly the same direction as the exit road goes, and if there is a plurality of roads along which at least one of the those A-entrance lanes is permitted to leave the intersection, then the car navigation device 1 determines the selected intersection to be a lane guidance intersection and executes the process for the lane guidance at the intersection.
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