Under nighttime driving conditions, you should switch to low beams when an oncoming vehicle is within 500 feet.

• A. True
• B. False
• C. Only when there is fog
• D. Only when driving above 60 mph

Answer: (A)

When you’re driving at night, dim your headlights to low beams when an oncoming vehicle is within about 500 feet. This reduces glare for the other driver while still letting you see the road ahead. High beams can blind the driver coming toward you and also reduce your ability to react to hazards, so the rule is to switch to low beams as soon as you’re within that distance. The idea isn’t about fog or speed; fog requires reduced visibility but you still shouldn’t blind others, and speed doesn’t change when you should dim your headlights.