Correct answer
Enough to stop without collision if the vehicle ahead brakes suddenly.
Enough to stop without collision if the vehicle ahead brakes suddenly, taking account of speed, grip and braking conditions. With more than one lane in the same direction, the additional Article 54(2) gap intended to facilitate overtaking does not apply, including its 50-metre minimum for heavy vehicles or those longer than 10 metres. This does not prohibit a larger margin or make 50 metres always sufficient. Signs and tunnels can impose specific minima; they are excluded here.
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Exactly 50 metres in every case, even if braking requires more.
The safe stopping gap plus a compulsory additional minimum 50 metres to facilitate overtaking on this road.
Enough to stop without collision if the vehicle ahead brakes suddenly.
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