After riding, does your hearing sound muffled , or do your ears ring? If so, then you are suffering temporary hearing damage,
which, if repeated regularly, may become permanent hearing damage.
Read this article from the Institute of Sound and Vibration Research:
http://www.isvr.co.uk/at_work/m_cycle.htm - Check out the photo of the dude on the police motorcycle - inside a wind tunnel.
I'm now using ear plugs on longer trips and I like the lower noise level.
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