What is the purpose of a Traffic Signal?

Traffic signals are used to assign vehicular and pedestrian right-of-way. They are used to promote the orderly movement of vehicular and pedestrian traffic and to prevent excessive delay to waiting traffic. Traffic signals should not be installed unless one of the warrants specified by the Texas Manual on Uniform Traffic Control Devices (TMUTCD) has been satisfied. The satisfaction of a warrant is not in itself justification for a signal. A traffic engineering study must be conducted to determine if the traffic signal should be installed. The installation of a traffic signal requires sound engineering judgment and must balance the following, sometimes conflicting, goals: Move traffic in an orderly fashion, minimize delay to vehicles and pedestrians, reduce crash - producing conflicts, maximize capacity for each intersection approach.

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1. What are Traffic Control Devices and what are they used for?
2. What is the purpose of a STOP sign?
3. What is the purpose of a Traffic Signal?