Chapter 4: Operational Considerations

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Section 1: Overview

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How a traffic signal will be operated and maintained needs to be considered along with the initial design and installation. This chapter covers several operational considerations, including coordination, preemption, and flashing operation. How a traffic signal interacts with adjacent signals, railroads, and emergency vehicles is important to the effectiveness of the transportation system.

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Equipment Repair

Failed equipment should be repaired by qualified personnel only. If the equipment is still under the manufacturer’s warranty, it should be sent to the manufacturer for repair. To minimize down time, spare units should be kept in stock for use while equipment is shipped for repair.

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