Today’s million dollar product safety idea:
A BlueTooth interface from your cell phone to your car that lets you operate the turn signals with buttons on the handset. Never be too busy to signal lane changes again!
Not that anyone would bother signalling anyway.
(Actually, I was really thinking about: A BT interface that, when you receive a call in your car and the vehicle is in motion, causes your phone to generate a high-voltage shock, forcing you to drop it on the floor to be crushed by the rotating knives located down there for just such a purpose).
Also: A sign that lights up on the side of your car with the words:
I HAVE RECEIVED XX CALLS TELLING ME I AM AN IDIOT
CALL ME AT XXX-XXX-XXXX
whereupon your car just shuts down (unlockable by a patrol officer) at some threshold of “You’re a moron” calls.