What can be used to alert support personnel to start or stop firing?

Using warning signal lights to alert support personnel to start or stop firing is an effective and clear method of communication in a fireworks display environment. These lights can be seen from a distance, even in bright daylight or noisy conditions, which ensures that the message is conveyed clearly without misinterpretation.

Visual indicators, such as warning signal lights, provide immediate and unambiguous alerts that can maintain safety and coordination among the team. In scenarios where live communication may be complicated due to noise from fireworks or distance, visual signals become crucial in ensuring that all personnel are aware of the status and can respond accordingly.

While options like audible alarms and walkie-talkies are viable communication tools, they may not be as effective in every situation due to potential background noise or interruptions in communication. Similarly, visual flags can be useful, but they may not ensure that everyone sees and understands them as promptly or reliably as a dedicated warning signal light system. Using warning signal lights aligns with best practices outlined in NFPA guidelines, making them the appropriate choice for this scenario.