What factor causes a decrease in a vehicle drivers's field of vision?
Show the correct answer
Correct answer
A. High speed.
Explanation
In the photo, you are driving along a wide multi-lane street in a city behind a dark car; on the right there are signs showing the lane layout. The factor that reduces the driver's field of view is high speed - answer A. Good visibility (B) improves the field of view, and too low a speed (C) does not narrow it.
A person standing still can take in about 180 degrees, but the faster they move, the more their brain focuses on a point far ahead, and the picture from the sides stops being registered. At 100 km/h the field of view is only a few dozen degrees, and at very high speeds only a narrow tunnel is left, from which a child on the pavement, a cyclist at a side entry and a car changing lanes next to you disappear. On a wide street like the one in the photo, with many lanes and side entries, you need a wide field of view, not a narrow tunnel. That is why the Road Traffic Act requires you to drive at a speed that ensures control over the vehicle, adjusted to the conditions and traffic density, and limits speed to 50 km/h in a built-up area. When you slow down, the field of view widens by itself - this is the simplest way to see more.
Legal basis: Art. 19 para. 1 and Art. 20 para. 1 of the Road Traffic Act (Prawo o ruchu drogowym)