Tests have conclusively demonstrated that there is a little correlation between what one perceives as a driver and what one perceives as a pedestrian. Man's concentration increases. While stationary or walking, man's attention may be widely dispersed, but when moving in an automobile, he concentrates on those factors which are relevant to the driving experience. The point of concentration recedes. As speed or motion increases, man's concentration is directed at a focal point increasingly further away.
Peripheral vision diminishes.
As the eye concentrates on detail at a point of focus a great distance ahead, the angular field of vision shrinks. This shrinking process is a function of focusing distance, angle of vision, and distance of foreground detail. Foreground detail fades increasingly. While concentrating on more significant distant objects, man perceives foreground objects to be moving and increasingly blurred. Space perception becomes impaired.