First, it's not clear to me that this is what is being proposed - instead, it sounds like the companies involved get their surveillance tech rolled into other apps like adware. Second, even if enrollment in the program was done more carefully (people shouldn't find out suddenly and in unfamiliar ways about intrusive technology), you'd REALLY want to study this to make sure that the jarring warning doesn't cause even more accidents.

I'm not against using technology to improve public safety, but I'm against half-assed ideas which would never hold up under reasonable peer or institutional review without a lot more careful consideration of safety and privacy.