All headlights on your vehicle must work properly and be correctly adjusted:

When approaching motorcycles.
At all times.
When driving on highways.
When driving in heavy traffic.
Explanation

Your vehicle's headlights are essential for safe driving in low-visibility conditions, including nighttime, fog, and heavy rain. They help you see the road ahead and make your vehicle visible to others. To ensure safety, your headlights must be properly adjusted, clean, and in good working condition at all times.
Remember that headlights serve dual purposes - helping you see the roadway and making your vehicle visible to others - making their proper operation a critical safety requirement.

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This question appears in the following DMV practice tests: