Cars have so many gadgets now. Some are amusing [all doors unlock from several yards away when button on key pressed], some are useful [folding wing mirrors].

My favourite is a rear window blind. With high level headlights on tailgating SUVs I am surprised this simple bit of kit is not included as standard. What's yours?

And what would you invent? I would invent automatic dimming of said lights when the onboard computer senses the car in front is less than 20feet away and the speed is less than 20mph.