The Effect of Speed on Vision While Driving
Visual Acuity One of the primary effects of speed is to decrease for objects in the foreground, which are rendered unclear because of the motion and vibration of the car. Investigation has shown that this range of sub standard foreground vision increases by approximately 20 feet for each increase of 10 miles per hour in speed. Thus at 20 miles per hour we cannot see details clearly within 40 feet ahead of the car; at 60 miles per hour, not within 120 feet or more. Let us imagine a driver…
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