Roadside noise as experienced by people living near highways has become one of the major environmental concerns in the past decade. This environmental pollution does affect the public''s comfort, health, and general standard of living. The impact of roadside noise is acute at night when the other background noise are minimal. The traffic noise from the adjencent highway which is experienced as a "roar" during the day changes to successive individual sounds - the "gunshot'' effect - at night. The problem of roadside noise is becoming increasingly severe as the traffic is increasing on highways, especially in urban areas.


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