It's for motorcyclists, not bicyclists, but I can kind of see how something like this might work for bicyclists.
The video demonstrates the
Dainese D Air racing air bag system, which is designed for use in Dainese motorcycle racing suits. Bicyclists don't tend to wear much protective gear -- we're usually much slower than motorcycle racers and heat can be a problem -- but this product brings some possibilities to mind.
Hat tip to Sue for this.
Read the complete post at http://feeds.feedburner.com/~r/Cyclelicious/~3/257848976/airbag-for-cyclists.html