Category:902 Signals (MUTCD Part 4)

Traffic signals are electrically powered traffic control devices that warn or direct vehicular and pedestrian traffic to take some specific action. Traffic signals provide for the orderly assignment of right of way to conflicting traffic movements at intersections.

Traffic signals are not a complete solution for traffic problems. Traffic signals can sometimes create additional congestion and cause additional delay to vehicles if improperly designed, installed, or maintained. Correctly designed and operated traffic signals installed at warranted locations will provide for the orderly movement of traffic, increase the intersection capacity, and in some instances, tend to reduce accidents. Coordinating and timing signals are very important.

Traffic signals are listed on the Statewide Transportation Improvement Program (STIP) in the description of the type of improvement if there is a probability of future signal control. If signals cannot be justified, they are to be eliminated from the program at the earliest possible date.

There are many aspects to be considered when inspecting construction quality and this article provides construction inspection guidelines and guidelines for material inspections.