Comparison of vehicle noise on dry and wet road surfaces

Vehicle noise depends on the characteristics of tires and the conditions of the road surface. In the autumn/winter and the winter/spring seasons road surfaces are often damp or wet. Except for the road safety the wet pavement has significant influence on the vehicle noise. The vehicle noise was tested using Controlled Pass-By method (CPB) on dry and wet road surfaces constructed of asphalt concrete, stone mastic asphalt (SMA) and paving stones. Supplementary measurements of noise level on the SMA surface were conducted employing the Statistical Pass-By method (SPB) relating to the passenger cars and the multiple-axle heavy vehicles (vehicle of 2B category). The values of difference of the statistical car noise level in the third-octave spectra range in the function of car speed on wet and dry SMA surfaces have been determined.