What condition applies if the yellow-red flag is used less than two miles from a restricted area?

The use of a yellow-red flag less than two miles from a restricted area indicates that specific instructions must be adhered to in order to ensure safety and compliance with railroad operations. This flag serves as a warning, signaling to train crews and personnel that they are approaching an area where additional precautions or protocols are necessary. The emphasis on following specific instructions helps to clarify expectations, outline necessary actions, and guide crews in responding appropriately to potential hazards.

While other options might seem plausible in different contexts, the requirement to follow specific instructions is critical in this scenario because it emphasizes the clear communication of safety protocols relevant to the restricted area, thus minimizing risks and enhancing operational efficiency.