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When designing a traffic signal, a traffic signal designer must consider a multitude of factors to ensure that the signal operates safely and effectively. One critical factor is signal phasing, which involves planning the sequence in which traffic movements are allowed to proceed. Proper phasing is essential for minimizing conflicts between vehicles and ensuring smooth traffic flow.

Another important aspect is utilities. Designers need to be aware of existing utility infrastructure, such as water, gas, and electric lines, which may impact the location and installation of the signal. This ensures that construction does not interfere with these critical services.

Cost is also a fundamental consideration. Designers must work within budget constraints while selecting equipment and techniques that provide the desired functionality and safety without overspending. This includes evaluating the long-term maintenance costs of the signal system.

By acknowledging all of these components—signal phasing, utilities, and cost—a designer can create an effective traffic signal design that addresses the needs of the roadway while ensuring safety and efficiency for all users. Hence, the answer encompasses the comprehensive approach needed in traffic signal design.