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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 judgement 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.