I have loved gravel in the past. but I gave up that love years ago for the pure lust of laying it down in cinder road pavement. Here in Southeast Iowa, on some back streets, they use a crushed coal cinder mix, I suppose left over from some local factories furnaces. The best part is it is easy to tell how deep to dig the cinders out of the flesh because it is black. Oh, and did I mention that it has the consistency of crushed razors? Ahhhhhhhhh, true love! I've never been able to forget my first time (cause all I have to do is look at the black scars on my right knee!).