What is the purpose of STOP/SLOW signals in flagging operations?

• A. To control the flow of traffic through a work zone
• B. To measure traffic speed
• C. To display project deadlines
• D. To indicate emergency signals

Answer: (A)

The main idea is to manage how vehicles move through a work zone. STOP/SLOW signals give drivers clear, immediate instructions from a trained flagger to either come to a halt or travel at a reduced speed, creating a safe, controlled path for workers and equipment. This helps prevent conflicts between moving traffic and the work zone, maintains safe clearance around crews, and coordinates flow so vehicles pass through without unnecessary delays or hazards. It’s about safety and orderly movement in temporary conditions, not measuring speed, displaying deadlines, or signaling emergencies.