Correct answer
Stop without a collision if the vehicle ahead brakes suddenly.
Stopping without a collision if the vehicle ahead brakes suddenly, taking speed, grip and braking capability into account. With more than one lane in the same direction, Article 54.2’s 50 m minimum for facilitating overtaking does not apply. This exception does not remove the safe stopping margin. Tunnels and other situations may have additional specific separation rules.
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Always exactly 50 m, even if this does not allow safe stopping.
A gap chosen solely to save fuel.
Stop without a collision if the vehicle ahead brakes suddenly.
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