DETERMINATION OF THE REFLECTION OF TRAFFIC NOISE FROM GUIDING AND PROTECTIVE INSTALLATIONS,TRAFFIC SIGNS AND BRIDGES

ERMITTLUNG DER REFLEXION VON VERKEHRSGERAEUSCHEN AN LEIT UND SCHUTZEINRICHTUNGEN,AN VERKEHRSZEICHEN UND BRUECKEN

IN ORDER TO CALCULATE AND DESIGN THE VARIOUS NOISE PROTECTION DEVICES,THE INCREASED SOUND LEVEL CAUSED BY REFLECTION FROM DEFECTS ON THE ROAD MUST BE KNOWN.AS THE RELATIONS HAVE NOT YET BEEN RESEARCHED,IT IS USUAL TO ASSUME SLIGHT DECREASES IN NOISE LEVEL AT CRITICAL POINTS OR TO TAKE ACCOUNT OF EXTRA COSTS WHICH MIGHT BE INCURRED BY ADDITIONAL MEASURES HAVING TO BE CARRIED OUT AT A LATER DATE.THE AIM OF THE RESEARCH PROJECT IS TO DETERMINE THE INCREASED SOUND LEVEL CAUSED BY REFLECTION BY MEANS OF MEASUREMENTS ON LARGE-SCALE MODELS-LARGE LOUDSPEAKERS ARE TO BE USED TO RADIATE THE NOISE.