By law, headlights must be turned on:

30 minutes before sunset until 30 minutes before sunrise.
One hour after sunset until one hour before sunrise.
30 minutes before sunset until 30 minutes after sunrise.
30 minutes after sunset until 30 minutes before sunrise.
Explanation

You are required to use your headlights starting 30 minutes after sunset and keep them on until 30 minutes before sunrise, regardless of how well-lit the area is. Additionally, always use your headlights whenever visibility is reduced to less than 1,000 feet, even during the daytime. This ensures your safety and makes your vehicle more visible to others.

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