In what way does the speed of the car affect the field of vision?
Show the correct answer
Correct answer
A. The field of vision decreases along with an increase in speed.
Explanation
In the photo, you are driving along a wide dual carriageway through a town; in front of you there is a pedestrian crossing with D-6 signs on both sides, the roadway widens into lanes with lane direction arrows, and a silver car is driving in the left lane. As speed increases, the driver's field of view becomes smaller - answer A. It does not become bigger (B), and it is not true that speed has no effect (C).
The eye registers details only in the narrow centre of the field, and the brain fills in the rest; at high speed the brain cannot process the picture from the sides fast enough and simply leaves it out. When standing still, you see about 180 degrees, at 50 km/h about 100, at 100 km/h only a few dozen, and at motorway speeds only a narrow tunnel in front of the bonnet is left. Pavements, cyclists and cars changing lanes disappear from this tunnel - and before a crossing like the one in the photo, the pavements on both sides are exactly what matters most. The Road Traffic Act requires you to drive at a speed that ensures control over the vehicle, taking into account traffic density and visibility, and limits speed to 50 km/h in a built-up area; at this speed you can still see what is happening on the pavements.
Legal basis: Art. 19 para. 1 and Art. 20 para. 1 of the Road Traffic Act (Prawo o ruchu drogowym)