A vision system for a vehicle includes a camera having a forward field of view, a control including an image processor that processes image data captured by the camera, and a global positioning system. Presence of a traffic light located ahead of the vehicle is determined at least in part by the global positioning system. At least one of (i) wireless communication is received at the vehicle and includes a communicated traffic light status of the traffic light ahead of the vehicle, and (ii) processing of captured image data determines an imaged traffic light status of the traffic light ahead of the vehicle. Responsive to determination that the vehicle is not properly responding to the traffic light status of the traffic light ahead of and being approached by the vehicle, the control at least one of (i) generates an alert and (ii) applies brakes of the vehicle.