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 on the ground. The type and condition of the road surface are the most important - answer C.
The Road Traffic Act requires you to drive at a speed that ensures control of the vehicle, taking into account, among other things, the condition of the road and the weather conditions - and it is the road surface that decides how much force a tyre can transfer. The same vehicle combination has a braking distance even several times shorter on dry asphalt than on ice, wet cobbles, mud or gravel, and this difference cannot be removed either by the size of the tyre (answer A) or by the engine power (answer B), which affects acceleration, not grip. The tyre and its condition are of course important - tread below 1.6 mm and wrong pressure worsen grip - but it is the road surface that is the changing factor you must take into account on every kilometre of the route, adjusting your speed and following distance.
Legal basis: Art. 19 para. 1 of the Road Traffic Act (Prawo o ruchu drogowym)