Lots of caps on patios and decks, but a driveway is a little different. If you go 3" and drill some rebar through the existing and leave it stubbed up you should be ok. But if you add 3" to your existing driveway, what are you going to do about the height of your new to match. Bring in dirt, sand, etc? Just don't make it 6" thick. That could get expensive.
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