Which description best describes the use of a manually operated temporary stop and go sign?

• A. A hand-held stop-and-go sign used by a traffic controller
• B. A fixed electric sign
• C. A detour sign
• D. A detector that measures traffic flow

Answer: (C)

Temporary traffic control at roadworks uses signs to direct and regulate drivers as exact routes around the obstruction are set up. A manually operated temporary stop and go sign is the tool a traffic controller uses to control the flow at a point where traffic must pass into a detour. By stopping vehicles and then releasing them in turn, the controller creates a safe, orderly movement through the detour and prevents conflicts where two directions would meet. This is why describing its use as guiding traffic along a detour fits best: the sign’s purpose is to enforce the detour by managing when vehicles can enter or proceed along that alternate route. The other options describe devices that aren’t about actively directing flow in and out of a detour at a control point.