Field study of a variable-height highway-noise barrier. Final report.

National Highway Traffic Safety Administration, Office of Research and Development, Washington, D.C.

Noise barrier attenuation: field experience. Final report.

Federal Highway Administration, Washington, D.C.

Noise barrier design handbook. Final report.

Federal Highway Administration, Washington, D.C.

Acoustics of sound transmission over noise barrier walls /

"December 1999."--Cover.

Roadside barrier effectiveness - noise abatement program. Final report.

National Highway Traffic Safety Administration, Office of Research and Development, Washington, D.C.