Correct answer
An increase in speed.
Increasing speed: more distance is covered during reaction, and braking distance normally increases. The gap must allow stopping without colliding if the vehicle ahead brakes sharply. Increase it for worsening grip, visibility or other conditions too; those are held constant here. Do not approach dangerously to prepare an overtake.
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A decrease in speed, with other conditions unchanged.
An increase in speed.
Wanting to overtake, in order to get as close as possible.
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