Why should bridges and overpasses never be flagged?

The correct choice emphasizes the critical safety consideration regarding flagging near bridges and overpasses. Flagging operations require that flaggers have a safe way to retreat in case of an emergency, such as an approaching vehicle that doesn't notice the traffic control measures. Bridges and overpasses often lack predetermined escape routes due to their structural design and location. This absence of safe retreat options significantly increases the risk to flaggers and potentially to drivers as well.

Bridges and overpasses can present additional complications, such as limited maneuverability and visibility for both flaggers and motorists. These factors contribute to an overall hazardous environment for flagging activities. By recognizing the importance of having a safe escape route, traffic control planning can better protect the safety of workers and the traveling public.