Sorry, getting a bit peeved now...
I pointed out in my original post that the system was flawed and that having the blood type on the sticker without any photo ID or otherwise would probably be fairly meaningless. HOWEVER it's a free sticker which has "do not remove my helmet" on it (which I think most would agree is a good thing to prevent untrained people from doing in almost all circumstances).
I must be one of the odd ones out.
Personally I would rather a person not trained in the safe removal of a helmet took it off and saved my life if it remaining in place meant my airway was compromised. Even if it meant the surgeons had a bit of work to do when I got to hospital. I'd rather get there alive. Sure I'd prefer it done by someone who knew what they were doing to minimise the risk of furhter injury, but if it's necessary I would prefer someone untrained didn't not bother cos a sticker told them not to.
Wouldn't happen?
A few years back a bike rider died when a driver pulled out on him at Haughley bends on the A14.
He didn't die of the relatively minor injuries sustained.
He died from drowning in the ditch he landed in, unconcious.
The ditch had just three inches of water in it.
He died because the driver who pulled out on him had been told not to move him in case it caused further injuries, and being unconcious face down in three inches of water his airway was seriously compromised.
Simply lifting his head clear of the water would have saved him.
Instead the driver watched him die.
The application of common sense would have seen the guy back on his bike in no time. The application of the instruction the driver had been given saw him have no chance whatsoever.
I'd rather not have the same happen to me because of a well meaning sticker.
The choice is totally yours tho.