Traffic+Signal

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Statistics on the increase of traffic incidents when lights are broken, the decrease of traffic/accidents when a traffic light is put in a difficult corner--newspaper articles
 * Other sources to consider:**

U.S. Department of Transportation's Research and Innovative Technology Administration (RITA), Intelligent Transportation Systems, [] ct

Historical development of the traffic light--did the need for traffic lights come from the increase of traffic or were they independent inventions? Who regulates traffic lights (state/federal/local)? How? Why? When did the colors of traffic lights become standardized? What advancements have been made to traffic lights to make them more efficient?
 * Additional Comments:**