I have had thoughts about this too. It is hard for me to think that the human factor is the only defense against an accident like this. Was there only one signal that told him he was about to crash? I agree; with all of the technology that uses GPS, there should have been some kind of alarm. Theoretically, I can't get lost no more driving my wife's new Tahoe. If I can tell it where I want to go, it can tell me how to get there and when I missed my turn. I know this stuff is in the new Choo Choos too.
DP