If they aren't paying attention their mirrors and turning round to look in their blind spots - what makes you think that they will pay attention to a screen on their dash?
We're talking about Americans, most of whom have been conditioned since childhood to pay close attention to television screens for hours on end. I know that I find that on screen display in my prius naggingly annoying. I have to disable it for long drives.
Operating Procedure:
Get you to love and depend on them
Gain your devotion to the faith
Teach you the rest of the rules
Threaten you with abandonment if you step out of line (in a nice way)
That sounds an awful lot like my marriage...
"Don't drop acid, take it pass-fail!" -- Bryan Michael Wendt