Correct answer
At least 50 metres, preserving any greater gap needed for safety.
At least 50 metres, in addition to the space needed to stop without collision after sudden braking. Leave more where safety conditions require it. Article 54.2 sets this minimum for MAM above 3,500 kg or total length above 10 metres. Paragraph 3 exempts built-up areas, prohibited overtaking, more than one lane per direction or traffic so saturated that overtaking is impossible. Tunnels and specific signs have other rules. This additional gap is neither a maximum nor a replacement for the safe following distance.
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Always exactly 20 metres, even if stopping needs more.
At most 25 metres, even if safe overtaking is prevented.
At least 50 metres, preserving any greater gap needed for safety.
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Glossary terms in this question
Conventional road
Interurban road that is not a motorway, dual carriageway or expressway.
Safe following distance
Gap a driver must keep from the vehicle in front to stop without colliding.
Overtaking
Manoeuvre of passing another vehicle going the same direction, temporarily using the opposing lane or a free lane.
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