Correct answer
Increase it as necessary to stop without a collision, according to conditions.
Increase it as much as necessary to stop without a collision, taking speed, visibility, grip, load and braking capability into account. Article 54 does not establish general rules of two seconds in towns, three outside towns or a universal one-second increase in bad weather. An advisory time reference does not guarantee safety in every condition. Also observe any applicable specific separation rules, for example in tunnels.
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Add only one second: it is always sufficient, regardless of the rain.
Increase it as necessary to stop without a collision, according to conditions.
Keep it unchanged even if grip deteriorates.
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Related questions
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