Traffic Signals (sometimes called ‘traffic lights’ or ‘stop lights’) are electric powered traffic control devices that warn or direct vehicles, pedestrians, and bicycle traffic to a specific action. Traffic signals assign the right-of-way for otherwise conflicting vehicle, pedestrian, and bicycle movements at an intersection, or other roadway location. They help provide safe, orderly, and predictable movement of all modes of traffic. The City and County of Denver is responsible for the effective operation of traffic signals within the city. Traffic signal maintenance includes preventive maintenance, emergency response, new construction, improvements and modifications, citizen requests, and the operation of the signal timing and communication systems.