Noise from a Road Intersection

It is assumed that noise propagation is governed by geometrical spreading and the ground effect. The deceleration noise is neglected and the acceleration and cruise components are taken into account. The cruise noise is described by the energy density level. To calculate the acceleration noise, the acceleration increment has to be known. It is shown how to determine both parameters. Two adjacent roads to the receiver O are considered to be prevailing noise sources (Figure 1). A prior knowledge of the numbers of light and heavy vehicles makes it possible to calculate the time interval average sound level, L _AT . As an example, the contours of the one-hour average sound level are calculated (Figure 4). The method presented here of L _AT calculation can be applied without buildings and other noise-reflecting objects nearby, within 100 meters from the intersection center.