When must high beam lights be dimmed when approaching oncoming traffic?

High beam lights must be dimmed when approaching oncoming traffic to prevent blinding the other driver. The correct response of 500 feet is significant because this distance ensures that the high beams do not interfere with the visibility of the oncoming vehicle, allowing both drivers to navigate safely and effectively.

This guideline is rooted in safety regulations that aim to reduce accidents caused by visibility issues at night. Dimming the high beams within this distance gives the oncoming driver enough time to adjust their vision, contributing to a safer driving environment.

Understanding this rule is crucial for driving etiquette and road safety, especially under low-light conditions where high beam headlights can create glare and compromise the oncoming driver's ability to see the road clearly. It's always best to adhere to this standard to promote safe driving practices for all.