The public transport is used cars, trucks and motorcycles - a motor tricycle landing gear, add more noise level increase may also be seen as follows: employing a motorcycle sound level 35 dB,Car audio level 60 - 25 dB, trucks have a noise level 95 - 120 dB, trains ran 100 feet away with a sound level 60 dB, an airplane has a volume 100 - 140 dB