1. A passive steering system of a vehicle comprising: a steering system operable to adjust the steering direction of the vehicle; and a control responsive to an image capture device capable of detecting lane markers along the road surface, said control being operable to control said steering system to adjust the steering direction of the vehicle in response to an output of said image capture device indicative of the vehicle drifting out of its occupied lane, wherein said control is operable to not control said steering system in response to activation of a turn signal of the vehicle.