. . . "highway noise" . "local and highway vehicles" . . "noise" . . "sound" . "roadway noise" . . "noise emission" . "sound propagation" . . . "Roadway noise" . "traffic noise" . . . "road vehicle and" . . . "vehicular noise" . "road traffic noise" . "raceway noise" . "sound levels from vehicles" . "Roadway noise" . . "road" . "Noise" . "noise emissions" . . . "roadway" . "vehicle noise emissions" . . . . "better design of roads" . "Highways Noise" . . .