Archives of Acoustics, 23, 4, pp. 481-490, 1998

Vertical distribution of road traffic noise

R. Makarewicz
Department of Acoustic Design, Kyushu Institute of Design, 9-1, Shiobaru 4-chome, Minami-ku Fukuoka, 815 Japan
Japan

R. Gołębiewski
Institute of Acoustics, Adam Mickiewicz University, 60-769 Poznań, Matejki 48, Poland
Poland

Road noise generated by freely flowing traffic is assessed by the time-average sound level, LAT. The noise interaction with the ground surface is the only wave phenomenon that modifies geometrical spreading. A simplified model of the ground effect is applied. The model is founded on the Weyl-Van der Pol solution. Prediction of the time-average sound level, at a perpendicular distance less than 100m and an altitude not exceeding a few tens of meters, requires two simultaneous measurements of LAT at the site of interest.
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