I have a friend that is considering buying a house a block from a 8 lane freeway. You can see the sound barrier from the street in front of the house since the highway is higher up then the house is. You can't hear it inside but it is very noisy in the backyard.
I think it's a mistake, though it is a nice house. This is not her forever house, at some point she will want to sell it. I think it will make resale much harder.
It just went on the market this week and she has just looked at 6 other houses. Of course, it's her choice but she asked my opinion.