I can't answer on Dabney with a fence. I live in Lake Denham. It seems the turnpike noise is much worse. However, 470 at Dabney to the bridge over the turnpike has some of the worst paving I've seen. There is a plan to change 470 in this area to 4 lanes. That will result in nicely paved new roads so I'm hoping that the noise is lowered.
I can tell you that the weather makes an incredible difference on turnpike/470 noise. If it's cool and clear it's very loud at my house in Lake Denham.
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