On which type of road surface will tires provide the best adhesion?

Question

DentroTest · Accepted Answer

Adhesion is the gripping force between the tire and the pavement. The correct answer is a clean road (ideally dry and rough), as it allows the tire rubber to have maximum contact and friction coefficient with the asphalt.  The other scenarios reduce safety: Gravel is very dangerous because loose stones act like 'marbles', reducing the contact area and causing skids. Grease or oil patches create a slippery film that eliminates friction, vastly increasing braking distance and the risk of sliding.

On which type of road surface will tires provide the best adhesion?

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