Transportation. The use of motorcycle, tricycle, cars, trucks and airplanes, increase, make the volume is increasing as well. May be classified as follows: to see motorcycle with sound, 35 dBCar audio level 60 - 25 dB, truck with sound 95 - 120 dB, trains running away 100 feet have noise levels 60 dB, the plane. Sound level 100 - 140 dB
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