I was thinking that, I might just go get the full airbag for the racing leathers as a dedicated just for that and another jacket just for the road. Even the alpine star, they have one that WILL do a dual function it can work on road or the track and you select the mode but give up some of the protection? or features by being a jack of all trades and not a master of one.
If I'm doing 140 on a track and go down, I want that vest to go off when it is supposed to as fast as possible, at those speeds YES that extra 2 or 3 ms IS a world of difference. The way I see it, if you slam into the side of a trailer at 80, that vest is not going to help you much, you pretty much screwed the pooch there because nothing is stopping your brain and organs from slapping around inside you at those speeds, but for most other stuff, it can make the difference between walking away or being carried away via medflight.
Aaron