Meanwhile, the position of the sonometer, in the emitting or receiving rooms, were defined in order to guarantee the following restraints: minimum distance between sonometer positions of 0.7 m; minimum distance between the sonometer position and the border of the pavement (or any diffusion building element) of 0.5 m; minimum distance between sonometer position and percussion machine of 1.0 m. In this case, the adopted distances are identified in Fig. 2.