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Roadway noise
Roadway noise is the collective sound energy emanating from motor vehicles. It consists chiefly of road surface, tire, engine/transmission, aerodynamic, and braking elements. In developed and developing countries, roadway noise contributes a proportionately large share of the total societal noise pollution. In the U.S., it contributes more to environmental noise exposure〔Senate Public Works Committee, Noise Pollution and Abatement Act of 1972, S. Rep. No. 1160, 92nd Cong. 2nd session〕 than any other noise source.
== History ==
Roadway noise began to be measured in a widespread manner in the 1960s, when computer modeling of this phenomenon was perfected. After passage of the National Environmental Policy Act and Noise Control Act,〔Public Law No. 92-574, 86 Stat. 1234 (1972) Noise Pollution and Abatement Act of 1972, codification amended at 42 U.S.C. 4901-4918 (1988)〕 the demand for detailed analysis soared, and decision makers began to look to acoustical scientists for answers regarding the planning of new roadways and the design of noise mitigation.
Partial bans on motor vehicles from urban areas have been shown to have minimal impacts upon reducing sound levels (as would become clear from later modeling studies); for example, the partial ban in Gothenburg, Sweden resulted in minuscule reduction of sound levels.
Regulation in the EU and Japan of tire and power-train noise has only sought to reduce noise by approx 3 Db, and will only slowly take effect because a few older noisier vehicles can dominate the soundscape.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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