Correct answer
At dawn while ambient light remains low.
At dawn. Twilight at dawn or dusk can make contrast and obstacles harder to perceive; dawn is not necessarily always the day’s worst visibility. Use the lights required by the road and conditions, without delaying when light is poor. Before sunrise, night-driving rules apply; afterwards lighting may still be required for reduced visibility, tunnels or other circumstances. Adapt speed to what you can see.
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At dawn while ambient light remains low.
At midday with sufficient sunlight.
In mid-afternoon with sufficient sunlight.
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