I have tried a blade, cultivator, landscape rake, and several homemades. The landscape rake works best to break up the gravel. The blade works best to move the gravel and shape the road. And all will work to do the final smooth. You need to add weight to the landscape rake to get it to dig in. Expect to make several passes to break up the gravel to a sufficient depth. Switch to the blade to move the gravel to the middle of the driveway and crown if desired. To smooth out the gravel, reverse the blade, or landscape rake, even drag a section of chain-link fence. Many things will work. When grading the parking area, you will cut deeper on the inside of the turn, or maybe it is the other way around. I forget. Anyway, the set of your instrument will change in a turn from the set you had when pulling straight.
Don Hayes
Don Hayes