Have a concrete driveway that's had tarmac laid over the top, stopped at a fence line which I now removed, any way to tidy the edges , do I need a fixed edge [steel angle or something] to run tarmac and concrete too in order to make a join.Or can I ramp fresh concrete to edge the tarmac as the tarmac crumbles easily on open edge.[Will need it stable in order for car to move over it .]