What is the purpose of the flash transfer relay in a traffic signal cabinet?

The flash transfer relay serves a crucial function in traffic signal systems by seamlessly switching the traffic signal from its standard operational mode to a flashing condition. This activity generally takes place during off-peak hours or when there is a need to give drivers a clear warning about changes in traffic control, such as indicating that the intersection is temporarily experiencing a malfunction or is in a mode that requires caution.

This transitional capability aids in maintaining safety and efficient traffic management by providing a distinct visual indication for drivers, alerting them to pay closer attention or to proceed with reduced speed. Other options, while they represent different potential functions in traffic signal management, do not represent the primary purpose of the flash transfer relay. The ability to modify signal operations in this way is essential for handling various traffic and safety scenarios effectively.