What are the three standard signals that all flaggers must use?

The three standard signals that all flaggers must use are "Stop," "Slow," and "Proceed." These signals are universally recognized in traffic control and are essential for ensuring the safety of both workers and motorists in work zone environments.

"Stop" is a critical signal that needs to be clear and decisive, indicating to drivers that they must halt their vehicles to prevent accidents or ensure that work can be carried out safely. The "Slow" signal advises drivers to reduce their speed and prepare for potential hazards ahead, allowing for a safe transition through the work zone. The "Proceed" signal communicates that it is safe for vehicles to continue moving forward, helping to maintain an orderly flow of traffic once the work zone is clear.

These standardized signals are fundamental to effective communication in traffic control settings and help minimize confusion for drivers, thereby enhancing safety for all parties involved.