Correct answer
Stop without collision if the preceding vehicle brakes abruptly.
Stopping without collision if the vehicle ahead brakes abruptly, taking account of speed, grip and braking under article 54.1. There is no universal ratio of two, three or four times reaction distance. Reaction distance is measured in metres and reaction time in seconds; neither should be confused with a following-time interval. Increase the margin when conditions worsen and comply with applicable special gaps.
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Always be exactly twice reaction distance in every condition.
Always be exactly three times it, regardless of grip or braking.
Stop without collision if the preceding vehicle brakes abruptly.
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