Correct answer
A gap allowing a collision-free stop after sudden braking, suited to conditions.
A gap allowing you to stop without collision if the vehicle ahead brakes suddenly, considering speed, grip and braking. There is no universal 50- or 100-metre figure for this situation. Increase the gap when conditions require it. Tunnels, underpasses and separation signs have specific rules excluded here.
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A gap allowing a collision-free stop after sudden braking, suited to conditions.
Always exactly 50 metres even with very poor grip.
Always exactly 100 metres regardless of speed or signs.
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