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The MUTCD contains criteria, or warrants, that define the minimum requirements for volume of vehicular or pedestrian traffic that are used to define the need for and appropriateness of a particular traffic control device. Warrants should be viewed as guidelines, not as absolute values. However, if no warrants are met, a traffic signal will not be installed. Satisfaction of a warrant is not a guarantee that a traffic signal is needed. The MUTCD states that proper engineering judgment should be exercised in making the final determination. More details about traffic signals is provided in the Information Brochures section of Traffic Operations
While adding a left turn phase can often improve safety and reduce delay, other solutions such as timing adjustments to improve gaps for left turns and geometric improvements to improve sight distance may be more appropriate. More details on left turn signals is provided in Information Brochures section of Traffic Operations.