For traffic spaces the adage is: only pave if necessary, and make the pavement as porous as possible for water and air. This is better for water management but also for underground life. In the Netherlands, clinkers with sand are a tried and true pavement type that can replace asphalt in many cases. Alternatives for the average traffic load are pavement with larger seams or stabilised sand. Footpaths can also be made with materials such as shells, gravel or lava stone, or as sandy walkways.