Specialty Gardening: Sound proofing barriers, 1 by Yellowbricks

Yellowbricks wrote:
We have a cottage in NC. In two years, the DOT is planning an extension of a highway which will terminate right at our property. They have determined that they will take the land that the pines are on., but not much more. We have already planted two weeping willows, to help with our privacy. The main trouble, though, is the sound from the road. I was thinking of planting a barrier of quickgrowing flora that might be a good sound barrier. I've been researching fencing, but I'm not sure I want to go that route.
Bamboo strikes me as a possibility, if I can control it. Any thoughts or other ideas?