Noise measurements were performed at short distances from a passenger car and a truck to determine the effect on sound emission of driving upon an interrupted metalled edge strip fixed to an asphalt road. The passenger car was driven at a speed of 80 and 100 km/h, the truck at a speed of 60 and 80 km/h. The results are expressed in the equivalent sound pressure level in 30 successive 1/3-octave bands with central frequencies between 25 and 20000 Hz. After spectral analysis, all results were converted to A-weighted sound pressure levels. For the truck, driving on the metalled edge strip resulted in a 2-3 dB increase in the sound pressure level in frequency bands from 80 Hz to 200 Hz; for the passenger car a 2-5 dB increase in frequency bands from about 80 Hz to 1000 Hz was obtained. (A)
Abstract