Audi Online traffic light system helps drivers hit the green lights
".... the car uses the internet to contact the area’s central traffic computer and asks it for the automated traffic light sequences. From these, the system calculates the best speed needed to hit as many green lights as possible..."
This is one of the things would be possible. Note: I was going to add this to an existing thread, but it was gone, Or I couldn't find it.
This Audi system is similar to what Amtrak uses on the Northeast Corridor. So it's not really an invention, it is an Innovation.