Which of the following factors has an impact on the increase of the braking distance of an agricultural tractor?
Show the correct answer
Correct answer
A. Decrease of the grip the tyres have on the road.
Explanation
In the photo there is a road on the edge of a town after a thaw, with a wet surface, puddles and snow on the shoulder; by the road there is sign D-18 "parking" with the plate "Koniec" (end). A decrease in the grip of the tyres on the road makes the braking distance of a tractor longer - answer A.
Brakes stop the wheels, but it is only the friction of the tyres on the road that stops the vehicle. When grip decreases - on a wet surface, in mud, on snow or ice - the tyres can transfer less braking force and the tractor needs a longer distance to stop. An increase in grip (answer B) works the other way and shortens the braking distance. Driving uphill (answer C) also shortens it, because gravity helps to reduce speed; driving downhill, on the other hand, makes it longer. On a wet road with puddles, as in the photo, increase your following distance from the vehicle in front and brake earlier, because the wheels can easily lock and skid.
Legal basis: Art. 19 para. 1 of the Road Traffic Act (Prawo o ruchu drogowym)