New grip for old roads
The process is a modified form of cold milling, the only difference being that the cutting tools are spaced more closely on the milling drum. The technique is called fine milling when the line spacing decreases to 8 mm or less.
The aim is to produce a defined new surface texture. Although fine milling drums cannot repair any damage rooted deep in the road structure, they can create a level, non-skid surface.
A single pass is all it takes - further steps, such as paving a new surface course, are normally not necessary.