What should you do if you encounter a closed taxiway sign?

Encountering a closed taxiway sign indicates that the taxiway is not available for use, which is critical information for ensuring safety on the airfield. The presence of a closed taxiway sign means that there may be obstacles, maintenance work, or other safety hazards present on that particular taxiway. Turning back immediately is the correct action to take when you encounter this sign, as it helps prevent any potential incidents that could arise from using a path that is not authorized for aircraft movement.

It's important to follow this protocol to ensure safety, as disregarding the closed sign could lead to unauthorized movement on a taxiway that is not open for traffic. Proceeding with caution or attempting to contact ground control may lead to delays or confusion, whereas turning back is the most straightforward and safe response to a closed taxiway indication.