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@Dammit
Moth- some of that could be modelled I reckon, you could run a wing mirror into a crash test dummy head at the correct closing speed of what, call it 50 mph?
Then simulate glancing blows etc.
Other than that its The World Of Assumptions, such as did the truck driver see him at all/etc.
I've loaded the information into my Assumption-O-matic, and it reckons that putting something between your head and a metal plate travelling at 50 miles an hour would reduce the transmitted force. Or something.
I've stopped wearing a helmet to commute, as I'm invulnerable within the M25.