High beam headlights should be used at night:

When following other vehicles.
When meeting other vehicles.
When driving in foggy areas.
When there are no oncoming vehicles.
Explanation

High beam headlights let drivers see twice as far as low beams. Use your high beam headlights whenever possible in open country or dark city streets, as long as it is not illegal and there are no oncoming vehicles. If you use your high beams, dim your lights for oncoming traffic and when approaching a vehicle from behind.

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