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TGR-
From memory: Shellgrip is the generic term for that sort of road surface covering. But that stuff is expensive to buy, expensive to lay properly, usually not laid properly and doesn't last as long. See where there are truck and the stuff gets worn. So from high grip, as the surface wears and detritus builds up the surface becomes smooth. Usually can see the worn bits where tyres tracks have been.
The worst was the tar and then stone chip covering that is dangerous and no longer used on roads with speed limits above 30mph.
lynx
Thought shell grip was a really bad idea.