How far away must you dim your lights when approaching another vehicle from behind at night?

Answer: B — 300 feet

Dimming your headlights when approaching another vehicle from behind at night is crucial for ensuring the safety and comfort of other drivers. The requirement to dim the lights at a distance of 300 feet is designed to prevent blinding the driver of the vehicle ahead, allowing them to maintain their visibility and react appropriately to the road conditions. This distance ensures that oncoming traffic does not experience glare from your headlights when you're close enough to be a potential hazard, promoting safer driving practices for everyone on the road. Thus, by adhering to this specific distance, you contribute to a safer driving environment, reducing the risk of accidents caused by diminished visibility.