“…Of particular interest is how to utilize the results of annoyance studies in many countries for the establishment of a general noise evaluation system. To shed light on this problem, Jonsson et al [1] conducted a joint study in Sweden and Italy in 1969 using a uni"ed method. They concluded that the di!erences in annoyance reactions seemed to be dependent on di!erences in living conditions, on di!erent requirements and on di!erent evaluations of motor tra$c as a part of the physical environment.…”