You must use high-beam lighting in all of the following situations, except:

• A. when there may be people along the side of the road
• B. on unfamiliar roads
• C. in fog, snow, or heavy rain
• D. in construction areas

Answer: (C)

High beams are best on dark, open roads with no oncoming traffic to help you spot hazards earlier. But in fog, snow, or heavy rain, the very particles you need to see scatter the light from your high beams back into your eyes, creating a bright glare that actually reduces visibility. That glare makes it harder to judge distance and see the road ahead, so high beams should be avoided in those weather conditions.

In areas where people could be along the roadside or in construction zones, high beams can blind pedestrians and workers, so using low beams keeps them visible without causing glare. On unfamiliar roads, high beams can be useful to reveal obstacles sooner when there’s no traffic, which is why that scenario is not the exception.