Correct answer
Enough to stop without colliding if the vehicle ahead brakes sharply.
Enough to stop without a collision if the vehicle ahead brakes sharply, considering speed, grip and braking capability. The extra overtaking gap and general 50-metre minimum for these vehicles are not required where overtaking is prohibited. This does not remove the safe-following requirement: more than 50 metres may be needed. Tunnels or other regimes may impose specific distances.
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Enough to stop without colliding if the vehicle ahead brakes sharply.
Exactly 50 metres, even if that does not allow a safe stop.
Only enough for the following vehicle to overtake, even though that is prohibited here.
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