Correct answer
At least 50 metres without reducing the necessary safe stopping gap.
At least 50 metres to help other vehicles overtake safely. Also maintain the gap needed to stop without colliding after sudden braking; if conditions require more than 50 metres, leave more. Article 54.2’s additional gap has exceptions in built-up areas, where overtaking is prohibited, with more than one lane in the same direction or when saturated traffic prevents overtaking. This scenario excludes those exceptions.
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Exactly 100 metres in every case even if less suffices to stop safely.
No additional gap provided it can brake without colliding.
At least 50 metres without reducing the necessary safe stopping gap.
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