Patent ID: 8614626

Claim:
A driving support device mounted on a vehicle comprising: a position detector for detecting a current position of the vehicle; a traveling direction detector for detecting a traveling direction of the vehicle; a map data memory for storing map data including road data, wherein the road data distinguishes a parking place road in a parking place of an express way from a main road of the express way, defines a plurality of shaping points for showing a shape of a road including the parking place road and the main road, defines a length of a segment between two adjacent shaping points, and defines an one-way attribution of the road; a map matching element for executing a map matching process based on the current position, the traveling direction and the map data in such a manner that the current position of the vehicle matches on the road of the map data; a traveling segment estimation element for estimating a current segment of the parking place road, on which the vehicle travels, based on the current position when a matched road is the parking place road; a main road search element for searching a segment back or forth of an estimated current segment of the parking place road and for determining whether a segment of the main road of the express way is disposed in a predetermined search distance from the estimated current segment; and a reverse run determination element for determining based on the traveling direction and the one-way attribution of the parking place road whether the vehicle travels reversely when the main road search element determines that the segment of the main road of the express way is disposed in the predetermined search distance from the estimated current segment.