Correct answer
Greater than normal.
It increases because reduced grip lowers braking capability. The change depends on speed, water, road surface, tyres, load and brake condition; twice the dry-road distance is not a universal upper limit. Reduce speed and increase the gap to suit conditions. Braking distance differs from total stopping distance, which also includes travel during reaction time.
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Shorter than if it were dry.
The same as if it were dry.
Greater than normal.
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