Correct answer
Between sunset and sunrise
Between sunset and sunrise under the stated conditions. In insufficiently lit tunnels and underpasses it may also be mandatory at any time, depending on speed and other conditions. Switch to dipped beam when required, especially to avoid dazzling, and do not use main beam while stopped or parked. It is not a blanket requirement on every road outside built-up areas.
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Between sunrise and sunset
Between sunset and sunrise
At midday because of the risk of dazzling other road users
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