Question If you see taillights ahead while you are driving in fog: Answers The lights may not indicate where the road is as the vehicle may have pulled off the roadway. You can assume the vehicle ahead is on the road. It may be an optical illusion. Explanation When driving under foggy conditions, lights cannot be taken as a reliable indication of where the road is. The lights may be coming from a vehicle that has pulled off the road. Take a FREE Practice Test Now This questions appears in the following tests: Oklahoma Knowledge Test Class A , Mississippi Passenger , Vermont Passenger ,