Cycling infrastructure should be surfaced in one consistent colour, as much as possible, to provide clarity, visual priority, legibility and continuity. 

The best option is red asphalt - red is the most commonly available colour of asphalt, after black. Cycling infrastructure in the Netherlands is consistently built with this colour of asphalt, especially in urban areas. Red is also an attractive and sympathetic colour.

Cycleway with red asphalt surface, Utrecht

In rural areas and alongside roads, where legibility, priority and continuity are not so important to emphasise, standard black asphalt is appropriate.

Building cycling infrastructure with coloured asphalt, rather than adding paint to an asphalt surface, provide a smoother surface that is less slippy, as well as being longer-lasting.