Back in January at CES 2014, Audi announced its cool new traffic light recognition system. We already know most of the details of the system with its ability to interface with the traffic lights via Wi-Fi.
Some walk lights have buttons you can press to let the system know that there are pedestrians waiting to cross, while some others have a Pong game unit instead.
Too bad you can only find the latter in Germany.
I think things that can be used for multiple purposes will always trump those that only have just one use. There might be situations that come up where you might need something else than what that thing is currently being used for.