Time for me to weigh in with the hearing thing, having spent too much time out cycling this week with wind blowing into my ears and doing its best to tip me over in places yesterday. That was before it got proper rough in the afternoon too!
Not by choice, I go out cycling on rather windy days quite often. Regardless of direction, it can be really tough to hear where a motor sound is coming from, given I am usually as focused as possible on avoiding pot holes etc. Not that I managed to do so a few times today, but that's a different story. With a focused pair of eyes and brain, scanning the road for the best line to take which is especially important on narrow wheels, it is difficult to also focus the ears sufficiently on picking up noise from a particular direction.
That can be hard enough to do on a fairly calm today, adding in the wind blowing into your ears and it gets much harder. I am sure some individuals are better at that than me, likewise I am sure people like the honourable gentleman from Bletchley struggle more than I do. My memory of human biology certainly has me in agreement with him, the processing of sounds is a neurological process much like translating what the eyes see. That reminds me actually, I must get around to booking an eye test in the near future, just to keep a check on things. Mental note made!
So, hearing while trying to furiously pedal along and keep out of the way of traffic, it can be tricky when you factor in the wind as well. Especially so when preparing to turn off at a junction, make an appropriate and safe arm signal etc.
How so many people manage to cycle while texting etc on their bikes, let alone block out their hearing with music, I have no idea. My cheap JVC Gumy earphones have some level of noise isolation, which is amazingly helpful for knocking out background noise while playing music. I can keep the volume normally at perfectly safe levels as a result, not something I'm used to! I suspect those with full, over-the-head headphones, ear buds etc must have some crazy kind of death-defying ability!
Oh, and when I say I cycle a lot, I mean that. So far this week, in 3 days, I've done 128.5 miles. Next month is Tour de France and the Commonwealth Games, so my mileage will drop off a cliff for a month, but I think it's clear how serious I take my cycling! This month I am something like 750 miles, a new personal best with some more due to come tomorrow.
Would I dare do that sort of cycling without a helmet, or with hearing-blocking earphones? 100% *no chance*. My view is that one should give themselves the best chance of hearing and seeing, as well as trying to protect their head as much as possible. It's just sensible, although I appreciate other people have different views.