Which of the following is NOT one of the three official hand movements for flagging according to MUTCD?

The correct choice indicates that "Wave" is not one of the three official hand movements for flagging as outlined by the Manual on Uniform Traffic Control Devices (MUTCD). The three official hand signals used by flaggers are designed to effectively communicate important information to drivers, ensuring safety on work sites.

The "Stop" hand signal involves holding the flag directly in front of the flagger, signaling vehicles to come to a complete halt. This is a crucial command to prevent accidents when work is being undertaken.

The "Proceed" hand signal is executed by holding the flag in a horizontal position, indicating to drivers that they can continue moving forward. This helps maintain the flow of traffic in areas that are temporarily obstructed.

Lastly, the "Alert/Slow" signal is represented by the flag being held at a downward angle, warning drivers to reduce their speed as they approach the flagged area.

Understanding these three official hand signals is essential for flaggers to manage traffic safely and avoid confusion on the road. The inclusion of a gesture like "Wave" does not meet the standardized communication needs and is not recognized within the authoritative guidelines established by the MUTCD.