The primary effect of speed is to reduce the number of objects in the foreground which are unclear due to car motion and vibration. Studies have shown that this range of subcontractor prevention measures will increase this range by about 20 meters, with a speed of 10 miles per hour. So 20 miles per hour can not see details clearly 40 meters in front of the car; 60 miles per hour, not 120 feet or more.
Imagine a 20/20 20-inch driver at 60 mph. There is a highway sign forward, with three lines of writing on it. This driver does not know the area – his memory can not be any help – so you have to read the signal. We've already seen that this drive can read 5-inch letters from 280 feet. Now we know that when your car reaches 120 feet from the signal, you can not clearly see the details. He is only 160 feet or 1.8 seconds to read the mark.
A 20/60-vision driver can not see the same signal before reaching 93 feet – but his close-up vision was affected by the first pilot as well. Can this drive read three serial messages? The reduced close-up problem explains why some drivers are in an emergency or suddenly slow down on the road sections, especially at super-highway exits. You should always be aware of these dangers and be ready for the sudden emergence of other drivers. If you know the area where you are driving, you will have a brief glance at the sign – but remember that strangers who do not know their journey will need a longer time.
Road departments, having studied this problem, include symbols as much as possible or write down the written message as soon as possible. Super motorways always have large and easy-to-read letters.
The field of vision
The field of vision decreases with concentration and speed. If you focus on a single object, the field of vision is zero – which is usually done at the new leaders because they tend to look at what they consider important. The field of vision also narrowed. When it is stopped, the driver's field of vision can be up to 190 degrees, but the same person will reduce the angle by 40 degrees to 60 mph. Therefore, whenever possible, the motorway signs are placed along the road.
Appreciation of good distance is a function of good visual acuity. As the view is reduced quickly, distance measurements can also be adversely affected if you are moving fast.
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