A commercial truck has two factory-installed fog lights. One of the lights is not working. Is this condition cause for rejecting the vehicle?

Yes, a non-functional fog light can be cause for rejecting a commercial truck, especially if it is required by regulations or safety standards in the vehicle's jurisdiction. Fog lights are essential for visibility in poor weather conditions, and their failure may compromise safety. However, the final decision depends on specific inspection criteria and regulations applicable to the vehicle.