| 摘要 |
PURPOSE:To make it possible to easily judge the passage of a vehicle, by displaying vehicle width marks at a predetermined distance ahead from the vehicle. CONSTITUTION:The content of display for drive data by a drive data display unit 2 is changed over by means of a display mode change-over switch 10. When the display mode change-over switch 10 is turned into a vehicle width mode, a drive circuit 11 allows the display unit 2 to show vehicle width marks. These vehicle width marks passe through a magnifying lens, then being reflected at a total reflection mirror 4 and further being reflected by a front glass pane 1, and are finally imaged as vehicle width marks 5 outside of and in front of the front glass pane 1. Accordingly, it is possible to easily judge whether the vehicle may pass through a road or not by comparing the actual width of the road with the vehicle width marks 5 displayed at a predetermined distance ahead from the front glass pane 1.
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