Okay, here is the scenario-
I'm driving down the road and i get a text message. I respond with "I can't talk right now for I am driving." As I send this message back, I crash my car.
Simple Solution -
Allow users to turn on "Google Safe Driver Services"
This will link Google+ with Google Location Services for which if you are moving faster than 10 mph, Google+ automatically responds to any text message with a custom message saying something like "I am driving right now and will get back to you when I have reached my destination"
This feature could also be used for phone calls as well!
Missoula Software & Sales