Put some music softly on the stereo. If anyone mentions the road noise, say that you never really noticed it, as it becomes "white noise" that even helps you get to sleep at night. Say some people pay money for tapes of "white noise" but this house comes equipped!

How well is the house insulated? When we got oam insulation blown into our house (when I was a kid) it cut the road noise by an amazing amount. We had never even really noticed it before, but had to get used to it being so quiet!

Also planting bushes between the house and the road, when they grow in, will help muffle road noise, too.