When visibility is reduced to what distance must headlights be used?

Headlights must be used when visibility is reduced to 500 feet or less. This requirement is in place to ensure that drivers can see the road clearly, and are visible to other vehicles and pedestrians in low visibility conditions, such as during rain, fog, or night driving. Using headlights enhances safety by improving visibility for both drivers and for others on the road. Drivers need to be aware of their surrounding conditions and adjust their use of headlights accordingly, as failing to do so can lead to accidents due to insufficient visibility.

In contrast, the other distances mentioned, such as 100 feet, 250 feet, and 1000 feet, do not align with the established regulations regarding the use of headlights in reduced visibility conditions. These options do not reflect the standard safety practices recommended by the Virginia DMV.