What is the colour of wigwags that signal drivers to stop?

Wigwags are traffic signals designed to alert drivers about important safety information, particularly around airport operations. The color that indicates drivers must stop is flashing red. Flashing red signals are universally understood as a warning to halt, ensuring that drivers are aware of potential hazards ahead and allowing for safe movement of aircraft or other operations in the area.

While flashing green signals typically indicate that it is safe to proceed and flashing amber may suggest caution or to reduce speed, they do not convey the same immediate instruction to stop. White signals are often associated with other functions and are less common in the context of traffic signaling for vehicles. By understanding that flashing red corresponds to the command to stop, drivers can better navigate and comply with safety regulations in airside operations.