Correct answer
Normally lengthens it, without a universal exact multiplier.
It lengthens it. There is no universal exact multiplier of two, three or four: grip, speed, tyres, vehicle and other conditions matter. Reduce speed and increase safety margins in rain; anticipate braking and avoid abrupt actions. Advice to increase following distance is not an exact formula for every braking event.
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Always multiplies it by exactly four.
Always multiplies it by exactly three.
Normally lengthens it, without a universal exact multiplier.
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