Which of the following factors has the greatest impact on the grip of the truck tyre to the ground?
Show the correct answer
Correct answer
C. The type and condition of the road surface.
Explanation
The question is about the factor that has the greatest effect on the grip of a lorry tyre. It is the type and condition of the road surface - the answer is C.
The Road Traffic Act requires you to drive at a speed that allows you to keep control of the vehicle, taking into account, among other things, the condition of the road, visibility and the weather conditions - because it is these that decide grip. The same tyre grips dry asphalt several times better than an icy roadway, and wet leaves, sand, ruts or spilled oil can take the grip away in a moment. The size of the tyre (answer A) is of secondary importance, and the engine power (answer B) does not increase grip at all - if you accelerate too hard, a skid is actually more likely. That is why, when you see a change of surface, for example paving stones, gravel or a frosty roadway on a bridge, you slow down in good time.
Legal basis: Art. 19 para. 1 of the Road Traffic Act (Prawo o ruchu drogowym)