3. Europe's Anti-Red Light App
Availability: Several years/not nearly soon enough
The Compass4D program is an ongoing European traffic project focused on intersections, but the fact that it's adorably buried under the heading "Energy Efficient Intersections" is a little tidbit on an already-in-testing app. It's hooked up to the traffic light system, and it can recognize when a red light makes no sense, so it can change a red to a green. It's really for emergency vehicles and large trucks, but still, that traffic signal alchemy you always dreamed of is real, and will actually be here some day.