The average perception time for an alert driver is:
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0.25 to 0.5 seconds.
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3 to 4 seconds.
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0.75 to 1 second.
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1 to 2 seconds.
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Explanation
The average driver has a perception time of ¾ second to 1 second. Perception distance is the space your vehicle travels from the moment your eyes see a hazard until your brain recognizes it. Perception distance is affected by physical and mental conditions, medication, as well as weather conditions and the hazard itself.
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