What is a key factor in marshalling aircraft in low-visibility conditions?

In low-visibility conditions, effective marshalling of aircraft is critically reliant on communication devices and the use of lighting equipment. The visibility challenges posed by fog, rain, or darkness make it essential to ensure that marshals can effectively convey signals to pilots and other ground personnel. Communication devices, such as radios, allow marshals to maintain constant contact with aircraft and coordinate movements safely. Additionally, employing proper lighting equipment helps illuminate key areas, making it easier for both marshals and pilots to see and interpret signals. Ensuring visibility through these means enables a safer and more efficient operation during challenging weather or low-light scenarios.