The answer in the space provided is headlight. Driving with a headlight is important during twilight hours and when there is a presence of fog and it is already dark. This will enable other cars to see you vehicle and to avoid further accidents from happening when your vehicle is not seen or visible because you don't have you head light turned on.
The law requires the use of lower passing beams during all twilight hours when it is dark or during fog, smoke or rain. This law is required to be followed through the U.S. to ensure drivers safety.
