Acknowledgements

The Organization for Environmental Growth, Inc., gratefully acknowledges the support and advice provided by the representatives of the United States Department of Transportation, Federal Highway Administration, involved with this project. The efforts of the FHWA Project Manager, John R. Schultz, and of the members of the FHWA Technical Review Panel contributed to the smooth performance of this contract and the efficient production of this manual. Panel members are Kenneth Anderson, Jack Bennett, Charles Grant, William Jones, Kenneth Overturf, and John D. Tarter.

Contacts with State Highway Departments in California, Minnesota, Oregon, and Washington resulted in the collection of a substantial amount of background material necessary for the production of this publication. The efforts of personnel within these state agencies involved with the field review and personal interviews are greatly appreciated.

Additional appreciation is given to the firm of Barton-Aschman Associates, Washington, D.C., which provided technical assistance and advice and to Vijay Kohli, for his research assistance and technical advice in the field of acoustics and noise control.

Project Staff

Project Director/Author	Randolph F. Blum
Architectural Assistance	Edward H. Johnson
Architectural Assistance/Graphic Production	Oudarone Sombat
Graphic Production	Michael Marshall
Acoustical Consultant	Vijay Kohli