Noise pollution and motorbikes

Why is there no enforcement of noise control on motor cycles? Our home is on the busy Valley Forge Road in Worcester, PA. The car noise is muted, but there is absolutely no control on the bikes noise emission. Today there were at least 50 motor bikes from the morning all showing off their motor muscle. Disgusting! If one cares so much about the environment, one needs to be aware that noise is also pollution.

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