Representative spectrum of road traffic noise

抄録

The representative spectrum of traffic noise is expressed in terms of the normalized Aweighted sound pressure level, δL_n. Assuming that the traffic noise annoyance is measured by the time-average sound level, the dependence of δL_nupon the traffic speed and the percentage of heavy vehicles has been derived. For traffic without heavy vehicles, an increase in traffic speed causes δL_n to decrease at low frequencies. The presence of heavy vehicles destroys the dependence of δL_n upon the traffic speed and may increase the value ofδL_n a few decibels at low frequencies.