When must headlights be turned on while driving?

Answer: B — When visibility is less than 1,000 feet

Headlights must be turned on when visibility is less than 1,000 feet to ensure that you can see the road, and other drivers can see you as well. This guideline is crucial for maintaining safety during conditions such as fog, heavy rain, or snow, when distance perception can be significantly reduced. Keeping your headlights on in these situations not only increases your visibility but also helps other road users to detect your vehicle sooner. This requirement helps prevent accidents and enhances overall road safety, making it essential for drivers to adhere to this rule in low-visibility conditions. While it is advisable to use headlights in the rain and at night, the specific threshold of 1,000 feet for visibility provides clear criteria for drivers to follow, ensuring consistent safety measures on the road.