1. A vehicle lane change aid system, comprising: a detector operative to detect the presence of another vehicle adjacent said vehicle; an indicator for providing an indication that a lane change maneuver of said vehicle may affect the other vehicle; a control receiving movement information of the vehicle, said control developing a position history of said vehicle at least as a function of said movement information, said control comparing said detected presence of the other vehicle with said position history and providing said indication when a lane change maneuver may affect the other vehicle.