Hello @melbourneswest. Good thing Austrialia is putting up solar panels. We should not be passive in the problem of the climate effect because it affects all of us. To answer your question, I can tell you that the permeable pavements are more economical than traditional pavements, so the cost-benefit ratio is higher. It is the resistance factor that prevents it from being the first option for roads with higher vehicular traffic; however, research in the area is looking for a solution.