What is the purpose of a flag line in a ROW work zone?

• A. To delineate restricted areas where entry is prohibited for safety reasons.
• B. To mark property boundaries.
• C. To indicate the nearest hydrant location.
• D. To designate detour routes.

Answer: (A)

In a ROW work zone, the flag line is the visible boundary that marks the safe working area and indicates where entry is not allowed because of hazards. The flags, tape, or markers outline trenches, heavy equipment, overhead hazards, and other dangers, helping workers and the public stay clear of danger. This boundary keeps unauthorized people out and supports overall safety procedures, including coordination with traffic control and flaggers. It isn’t about property lines, hydrant locations, or detour routes, which are shown with other kinds of markers and signs.