Correct answer
Enough to stop without a collision if it brakes suddenly.
Enough to stop without a collision if it brakes suddenly, taking account of speed, grip and braking capability. Article 54 does not require the additional gap for an overtaking vehicle to fit between the two inside built-up areas. There is no universal 50-metre minimum in this scenario; increase the gap when conditions require it.
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Enough to stop without a collision if it brakes suddenly.
A mandatory additional gap for another vehicle to overtake and fit between the two.
Always 50 metres, regardless of speed or road conditions.
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