What can be planned for emergency flashing operations of a signal that is needed at certain times?

A scheduled flashing operation is implemented when specific times are designated for traffic signals to flash. This is particularly useful in scenarios where certain conditions exist, such as school zones during specific hours, events at a venue, or when traffic patterns change due to construction. This planned approach allows for better traffic management while ensuring that motorists are alerted to potential changes in traffic control at predetermined times.

In contrast, a semi-flashing operation typically refers to a signal that operates in a flashing mode but not on a regular schedule, which could lead to confusion among drivers. Continuous operation keeps signals working at all times without interruption, failing to provide the necessary flexibility that scheduled flashing does. A temporary outage is not a planned operation and implies that the signal is not functioning at all, which does not serve the purpose of directing traffic during emergencies.