When must you have your headlights on when visibility is less than what distance?

Having your headlights on when visibility is less than 400 feet is essential for safe driving. This regulation is in place because when visibility decreases due to factors like rain, fog, or nighttime conditions, being able to see and be seen by other drivers becomes critical. Using headlights in low visibility conditions enhances your ability to notice obstacles and helps other drivers see your vehicle, thereby reducing the risk of accidents.

In many states, including New Mexico, it is required to have headlights on in these situations, ensuring that both the driver and other road users can operate safely. The 400-foot rule is a standard distance that provides a sufficient margin to react to unforeseen circumstances, ensuring vehicles are visible well enough to prevent dangerous situations. In contrast, the other distances of 100, 200, or 300 feet may not offer the same level of safety in reduced visibility conditions, which is why the 400-foot guideline is established.