VEHICULAR LANE DEPARTURE ALARM DEVICE

PROBLEM TO BE SOLVED: To provide a vehicular lane departure alarm device capable of rapidly outputting the lane departure alarm for the vehicle departure from a traveling lane of one's own vehicle to a median strip or a shoulder side, and suppressing frequent operation of the lane departure alarm except the request by a driver by retarding the output timing of the lane departure alarm for the vehicle departure from the traveling lane of the own vehicle to the other lane side of a single zone. SOLUTION: The number of lanes in a single zone SZ including the own vehicle traveling lane LA is detected, and when a plurality of lanes are present, the position of the own vehicle traveling lane LA in the plurality of lanes L is detected, and a first determination line Ld1 forming the reference is set on the edge side of the own vehicle traveling lane adjacent to the other lanes L of the single zone SZ as a departure determination line Ld. A second determination line Ld2 located on the inner side of the own vehicle traveling lane from the first determination line Ld1 is set on the edge side of the own vehicle traveling lane LA not adjacent to the other lanes L of the single zone SZ. COPYRIGHT: (C)2010,JPO&INPIT