A control system for a vehicle includes a camera having a field of view exterior of the vehicle. Responsive at least in part to processing by a processor of image data captured by the camera, the control system determines traffic lanes on the road. The control system determines a leading vehicle ahead of the equipped vehicle and determines a traffic condition where two traffic lanes change to a different number of traffic lanes. The traffic lane being traveled by the equipped vehicle is one of the two traffic lanes that change to the different number of traffic lanes. Responsive to determination of the traffic condition and responsive to detection of the leading vehicle moving from the traffic lane being traveled by the equipped vehicle into another traffic lane, the control system controls the steering system of the equipped vehicle to follow the leading vehicle into the other traffic lane.