I do a lot of road planing (big machine takes up to 250mm of tarmac off the road and it goes into the back of our trucks). The vast majority of it we sell to farmers and anyone else who wants to make up their muddy tracks and yards. If you put it down right it will go down like rock. In this respect it is recycled. We do sometimes take it to the local tarmac plant where it is re-used. It cannot be used for the top coat (wearing course), but can be used in base course and road base (up to about 25% I think). The main company that make road planers is a German firm called Wirtgen and they have brought out a machine that you hook up a bitumen tanker and a cement tanker to and it recycles the planings directly into base course. I haven't seen one and as far as I know there isn't one in the UK, but its a large investment as they cost about �1million each.