On Thu, 25 May 2017 06:35:32 -0700 (PDT), wrote:

Discovery Channel's Daily Planet had an item on this yesterday:
https://www.youtube.com/watch?v=mzoakbBxm5g.

This version of the video shows a few additional applications for the
air bag helmet. For example, you never know when you might be tackled
by a football player while riding your bicycle.
https://www.youtube.com/watch?v=Jmkt6mg7mmM

Tested at Stanford:
https://www.youtube.com/watch?v=vg6yl7zbIz0

Lots of other videos on their YouTube channel:
https://www.youtube.com/channel/UCIfiRXN-4CZsOTn0X0KCWJQ

One big obstacle might be the cost. US$540 in 2013:
http://newatlas.com/hovding-inflatable-airbag-collar-purchase/29828/
and US$335 in 2016:
http://www.popsci.com/airbags-for-cyclists-heads-examined-as-alternatives-to-helmets

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558