so I'm raising the surface by 0 - 200mm over a large area. Using all asphalt is too expensive, do you think I can just chip off a layer of existing asphalt, throw some crushed rocks on top, then put new asphalt down? I'm asking because I seem to recall that crushed rock only goes beneath asphalt but not on top, and that to add more rocks, you need to remove all the existing asphalt. Is this correct?
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