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Why is anti-skid dressing sometimes applied to pavement surface?

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Skid resistance of road pavement plays an importance role when vehicles take a bend or brake. The use of anti-skid dressing increases the friction to reduce the possibility of skidding. Anti-skid dressing refers to the road surface treatment which includes high-friction calcined bauxite as the high Polished Stone Value artificial aggregate, together with a resin (epoxy, polyurethane) instead of bitumen to tie the aggregate to the road surface. It is more expensive but is more durable in difficult sites such as crossing and roundabout. Moreover, it also has side benefits of good acoustic quality.

Anti-skid dressing has normally a different colour to the road surface and used to be red in colour. Anti-skid dressing is commonly used in areas which require higher friction values such as approach to roundabouts and
traffic lights.

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The ability of the road surface to resist kidding is a combination of the surface texture of the road surface and the Polished Stone Value of the aggregate in the road surface. The higher the Polished Stone Value the
higher resistance the aggregate has to polished, and hence the greater the capability the aggregate of retaining its own texture. Surface texture of the road surface is often referred to as macrotexture while texture actually on the surface of the aggregate is known as microtexture.

Bleeding forms a sticky and shiny surface which results in the loss of skid resistance for vehicles in wet weather.

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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