It's time to fix the driveway for real. About 10 years ago, I built a driveway with "road base", which in my area is recycled concrete and limerock mixed. It has served us well, except for 2 spots where I suspect I just didn't get it thick enough, the rest of it has hardened and packed down like concrete. It has ruts where we drive on it, leaving the center higher, and I also screwed up the slope for drainage (left it flat, should have sloped it to one side). The plan is to go over it with milled asphalt. I have access to a transit level, compactors of all sizes, my tractor with bucket and box blade. The questions are: 1. Where the 2 bad spots and ruts are, am i better off just adding more milled asphalt to bring it up to the rest of the drive, or should I fill in with some gravel/fines first (the ruts are probably 2" deep at the worst). 2. Since I already have a solid 6" base, is 4" of milled asphalt enough to make it bulletproof. 3. Should I blow off/broom off loose dirt and leaves first, or is that a waste of time. 4. Anybody got a better idea for establishing the depth of the asphalt I'm putting down besides just driving a bunch of stakes beside the drive and stringing between them.