"system of traffic lights'"?  What I am talking about is a "modern system" called "Adaptive Signal System For Traffic Reduction". The system utilizes adaptive traffic signal control software, wireless and fiber optic communications, and vehicle detection cameras, which are coordinated at a  Traffic Management Center. Managing the flow of over 400,000 vehicles daily thru an area which is beyond the ability and capacity of even the most intelligent traffic engineer - is managed by a computer software.  
Seven traffic lights in 2 minutes. Topeka, Kansas, has activated the first of three key traffic corridors to receive a "green light tunnel," a real-time adaptive traffic signal system that synchronizes signals to create a series of green lights for motorists. The result is fewer stops, less travel time and -- most importantly -- a lot of saved gasoline.