In a document dated February 15, 2005 called Quieter Pavements - Options & Challenges for Washington, WSDOT's Tom Baker (material) and Mia Waters (noise expert) acknowledged that the Federal Highway Administration (FHA):
"is changing its policy to allow pavement as a source of noise mitigation in the near future. We have an opportunity to control some of the noise at the source (the pavement) instead of blocking it with a wall. It is likely that pavement as noise mitigation will be allowed if after additional research and pilot projects:
-we certify that we can achieve certain initial noise reductions,
-the noise reductions meet a certain lifespan, and
-we commit to replacing the pavement with one of similar noise reducing qualities in the future."