What is the main factor determining the grip of a bus's tyres on a dry road?
Show the correct answer
Correct answer
A. The type of surface of such road.
Explanation
In the photo you can see a close-up of the wheel of a red bus standing on a dry surface. The grip of a bus's tyres on a dry roadway depends mainly on the type of road surface - answer A.
The Road Traffic Act requires you to drive at a speed that ensures control over the vehicle, taking into account, among other things, the condition of the road. On a dry roadway it is the type of surface that decides the grip: rough asphalt holds a tyre much better than polished paving blocks, cobblestones or dusty concrete. Engine power (answer B) does not increase grip - on the contrary, sharp acceleration easily ends with the wheels spinning. A properly working steering system (answer C) lets you steer the bus precisely, but it does not change how firmly the tyre holds the road. That is why, when you see a change of surface, especially to paving blocks or cobblestones, you slow down in good time.
Legal basis: Art. 19 para. 1 of the Road Traffic Act (Prawo o ruchu drogowym)