Correct answer
50 metres, without reducing the stopping gap needed for safety.
At least 50 metres in this case, to help a following vehicle overtake safely. Also maintain enough stopping distance to avoid a collision if the vehicle ahead brakes suddenly; this may require more than 50 metres depending on speed, grip and braking. The additional Article 54(2) gap is not required in built-up areas, where overtaking is prohibited, with more than one lane in your direction, or when traffic is too saturated for overtaking. Tunnels have specific rules.
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20 metres regardless of speed or grip.
No additional gap, even when all the stated conditions apply.
50 metres, without reducing the stopping gap needed for safety.
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Related questions
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