Onboard road map display systems

Details Onboard road map display systems Onboard road map display systems

1992-03-19

1993-10-26

Swarthout, Brent

Communications: electrical

Vehicle position indication

Map display

340905, 364436, G08G 1123

Patent

active

052570231

ABSTRACT:
A road map display system mounted on a vehicle for navigation guidance is arranged to discriminate monitored roads in which traffic conditions are monitored, from unmonitored roads, and to provide reliable information on traffic congestion to a driver of the vehicle. The road map display system includes a display device and a map image processor which controls the display device to display a road map image of the monitored roads distinguished from the unmonitored roads. Preferably, the display system includes a selector switch for selecting one of a normal display mode in which all roads are displayed around a current vehicle position, and a second display mode in which only the monitored roads are displayed with stepwise gradation to indicate degrees of congestion.

REFERENCES:
patent: 4409583 (1983-10-01), Dahan et al.
patent: 4608656 (1986-08-01), Tanaka et al.
patent: 4737927 (1988-04-01), Hanabusa et al.
patent: 5182555 (1993-01-01), Sumner

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