That's a pretty cool idea, but aren't you better off calling 911 or your local equivalent? What about liability issues? What about responsiveness? This thing needs to be fast and non-intrusive !

I was in a (non-life-threatening) accident last week and I can think of a couple of useful first-aid pointers lots of people overlook, like:

* so what is the local emergency number? (based on GPS position) * "let's give him something to drink to comfort him ..." (Don't !)

Basically a decision tree to help people with basic first aid. These protocols exist in the first aid world.