Correct answer
The interval between perceiving the hazard and beginning to act.
The interval between perceiving the hazard and beginning the response, for example applying the brake. The vehicle continues covering distance during this interval; braking distance then begins. It is not identical for every person or situation: distraction, sleepiness, alcohol and other factors can extend it. Maintain a gap and speed that allow a safe response.
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The time from applying the brake until the vehicle stops.
The interval between perceiving the hazard and beginning to act.
A fixed time unaffected by sleepiness or distractions.
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