What is the main factor determining the grip of a tractor's tyres on a dry road?

Explanation

Correct answer: The type of surface of such road.

Tyre grip is the result of friction between the rubber and the road surface. Different materials, such as asphalt, concrete or block paving, have different roughness and texture, which directly affects the amount of friction. Therefore, the type of road surface, even when it is dry, fundamentally determines how well the tyres will grip the carriageway.

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