Correct answer
The distance that would allow me to stop if it braked suddenly, without colliding with it.
Keep a gap allowing you to stop without collision if the vehicle ahead brakes suddenly, taking account of speed, grip and braking capability under Article 54(1). Signalling an intention to overtake does not remove that duty. The additional gap under Article 54(2), to allow a following driver to overtake, applies when that intention is not signalled; for vehicles over 3,500 kg MAM or over 10 metres long it is 50 metres, subject to Article 54(3) exceptions. It is not a universal 50-metre requirement in every situation and does not permit losing the safe stopping gap.
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The distance that would allow me to stop if it braked suddenly, without colliding with it.
I don't have to leave any separation distance.
Twice the length of the vehicle I intend to overtake.
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