Correct answer
Yes, to avoid dazzling.
Yes, as soon as you recognise the possibility of dazzling. This duty protects all road users, including pedestrians, and applies on straights and bends. Do not wait for a person to show discomfort or retain main beam simply because you exceed 40 km/h: preventing dazzle takes precedence. Also adjust speed to the illuminated distance, visibility and pedestrians so you can stop safely.
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Yes, but only on straight sections.
It is not necessary.
Yes, to avoid dazzling.
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