Correct answer
Enough to stop without collision if the preceding vehicle brakes suddenly.
Enough to stop without collision if the preceding vehicle brakes suddenly, considering speed, grip and braking. Article 54.1 retains this duty in built-up areas. The described scenario does not impose a fixed 50 m gap, and a gap facilitating overtaking is insufficient if it does not permit safe stopping. Tunnels and specific signs can impose other conditions.
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Always exactly 50 m, even if conditions require more.
Only enough to facilitate overtaking, even if stopping without collision is impossible.
Enough to stop without collision if the preceding vehicle brakes suddenly.
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