Motor vehicle noise spectra, their characteristics and dependence upon operating parameters

Data obtained from many sources are used to describe the physical characteristics of traffic noise, its individual components, and some of the means for reducing motor vehicle noise. The noise characteristics of trucks, automobiles, and motorcycles are discussed separately. The composite of all motor vehicle noise (traffic noise) is described in terms of the operating parameters of interest, including vehicle speed, engine speed, throttle position, engine type, tire-tread type, and road surface smoothness. Subject Classification: 10.60; 50.25, 50.50.