At what visibility distance are headlights required to be on?

Answer: C — 500 feet

Headlights are required to be on when visibility is less than 500 feet. This regulation is designed to ensure that drivers have adequate illumination to see the road ahead and to make their vehicles visible to others, especially in low-light conditions such as dusk, dawn, or inclement weather. By requiring headlights at a distance of 500 feet, it promotes safety on the roads by helping to prevent accidents and allows drivers to respond appropriately to hazards. Using headlights ensures that a vehicle can be seen by others in sufficient time, which is crucial for safe driving.