Standing at a intersection, nobody else around, you're still stuck behind the red light, and this invisible barrier of governmental guilt has enough power to let you wait there and pollute the air more and more, just for a measly green light. Wouldn't it be leet having a laptop in the car where you could just select the intersection off a list, change the timing or current stream running, and ride off with fewer time wasted and fewer pollutants exhausted and a clear conscience.
Now, enough crap about the reasons, now for the technical shit.
Today's traffic controlling system is a well oiled redundant network that utilizes the same protocols that we are all aware of. Yes it is hackable and it is like in the movies. :) here we go!