This research discusses the mitigation measures against road traffic noise in Japan, Taiwan, the State of New South Wales in Australia, the State of Victoria in Australia and the State of California in the United States, covering the aspects of: (a) major legislation on road traffic noise control, (b) prescribed road traffic noise limits, (c) assessment of road traffic noise, (d) installing noise barriers, (e) reducing road traffic noise at source, (f) land use planning, (g) resurfacing roads with low-noise materials, and (h) installing double-glazed windows and air-conditioning for the affected residents.
