all (the) rear-ending
You'd also need good whiplash protection for that
You
may be correct and a decent quality motorbike helmet
may do the job and the after market comms and noise attenuation etc etc
may be suitable ...... I don't know - so I will stick with what has been
recommended by others.
As an aside - in these days of "Where there's a blame - there's a claim etc", what would an insurance company think if someone suffered a head injury while wearing a helmet not "approved" or "recommended" for helicopter use ?
Would this give them a get out from paying injury compensation ?
It could certainly delay any payment while legal teams submit their arguments.
Again I don't know the answer, and I don't want to see it put to the test, but it is one more element that goes towards making my own personal decision.