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How does wearing course provide skid resistance?

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The skid resistance of wearing course in a bituminous pavement is contributed by the macrotexture (i.e. the general surface roughness) and the microtexture (i.e. the protruding from chippings) of the wearing course.

These two factors affect the skid resistance of flexible carriage in different situations. For instance, when the carriageway is designed as a high-speed road, the tiny channels among the macrotexture help to drain rainwater to the side of the road and avoid the occurrence of aquaplaning.

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In low speed roads the microtexture has particular significance in providing skid resistance by gripping the car tyres to the road surface.

This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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