Drive assisting device for vehicle, has collision possibility determining unit to determine whether possibility of collision between certain and subject vehicles exists or not based on result of relative position determining unit

摘要

The device has a relative position determining unit (82) to determine whether a relative position relationship with a certain vehicle is maintained for a given period when a traveling state of a subject vehicle is determined to be proper. A collision possibility determining unit (83) determines whether possibility of a collision between the vehicles exists or not based on a result determined by the unit (82).