Correct answer
Increase it.
Increase it to provide the space needed to stop without a collision. Reduced grip can lengthen braking distance; also slow down and avoid abrupt manoeuvres. If brakes are faulty, increasing the gap does not make continued driving safe: stop somewhere safe and seek assistance.
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Reduce it because water always improves grip.
Increase it.
Eliminate it if the tyres are new.
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