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BDifficulty 2/5

With the same reaction time, how does a higher speed affect reaction distance?

Correct answer

It increases reaction distance.

It increases it: reaction distance is speed multiplied by reaction time, before braking begins. For example, assuming 1 second and constant speed, 36 km/h covers 10 metres and 72 km/h covers 20 metres. These are examples under stated assumptions, not guaranteed stopping distances. Total stopping distance also includes braking distance; higher speed alone does not require reaction time itself to change.

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  • It increases reaction distance.

  • It changes only reaction time, never distance.

  • It does not change reaction distance.

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