My grandfather had several and kept comprehensive notes on their performance just like the various brand VHS tapes.... (guess you have to do something when you get old)
However all that data which would now be pertinat to your cause is gone along with him....
I was fortunate very early in my linehaul career a company health nurse picked up a slight drop off in my right ear of industrial deafness. She said it would be from the wind noise of drivers window open at 90k.
I now drive with passenger window open instead and wear earplugs on bike. Tested again at new job and it hasn't gotten any worse than it was then some 15 years ago so that's good.
A lot of people don't realise but bass and low frequency noise like helmet and window wind noise is the most damaging.
Every great cause begins as a movement, becomes a business, and eventually degenerates into a racket - Eric Hoffer
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