6. Conclusions

Much has been accomplished since the first Workshop to develop a Roadmap for Quieter Highways in 2004. Many states have begun QPR programs and the database of measurements is growing. Many of the technological issues are better understood. We understand the potential solutions better and the limitations of existing pavements. Thus the dialog at the second workshop was significantly different than the first workshop. At this workshop, a substantial amount of tire/pavement noise data was discussed, there was greater emphasis on public education and engagement, there was continued discussion of policy alternatives, there was greater appreciation of the applicability of international technology to U.S. problems, and there was a clear desire to organize a national effort to share data in a manner that allows the community to progress in the development of quieter highways. The effort has gained significant momentum due to the accomplishments achieved toward the goals of the first Roadmap. This second Roadmap identifies another layer of issues that should be addressed. It also recommends that we capitalize on the higher level of activity to suggest a major, coordinated activity toward the goal of developing and implementing quieter pavement. Clearly, the agenda set in this Roadmap capitalizes on the momentum achieved thus far and takes us on another step toward making quieter highways a practical reality.