What is the primary traffic control device used by flaggers?

• A. A traffic cone.
• B. The Stop/Slow paddle.
• C. A baton.
• D. A speed radar sign.

Answer: (B)

Controlling traffic in work zones relies on a clear, standardized signaling tool that directly tells drivers what to do. The Stop/Slow paddle is the primary device because it communicates an explicit instruction—stop or slow down—in a highly visible, easily understood format. Its large letters, bright colors, and standardized use make it recognizable to drivers from a distance, which is essential for safety as vehicles approach workers and equipment. The paddle is designed for quick, unambiguous signaling and is portable so flaggers can position themselves as needed.

Delineation cones help set boundaries but don’t instruct drivers what to do; a baton may be used in some settings but is not the universally adopted primary device for directing traffic; speed radar signs are informational tools that warn drivers about speed but don’t give a direct stop/slow command.