During a night operation with limited visibility, which specific color and type of light should a marshaller use to guide an aircraft and what does it signify?

During night operations with limited visibility, a marshaller should use illuminated wands or light batons emitting a steady, non-blinking amber or yellow light. The amber or yellow color provides optimal contrast against the darkness and most types of precipitation, making the signals clear and easily distinguishable to the flight crew. These lights are typically powered by batteries and designed to be highly visible even in low-visibility conditions such as fog or rain. The steady, non-blinking light is crucial because a flashing light can be disorienting to pilots, particularly in poor weather. The amber or yellow light signifies to the pilot that the marshaller is providing guidance and direction for taxiing, parking, or pushback. The intensity of the light should be adjusted to suit the conditions; too bright and it can cause glare, too dim and it might not be seen. Marshallers are trained to use specific hand signals in conjunction with these lights. For example, moving the wand in a sweeping motion indicates the direction of turn, while raising both wands above the head in a crossed position signifies an emergency stop. The consistent use of amber or yellow light with standardized hand signals ensures clear and unambiguous communication between the marshaller and the flight crew, thereby minimizing the risk of accidents or incidents during low-visibility night operations. Furthermore, the marshaller should ensure that their reflective safety vest is clean and highly visible, to avoid becoming a collision hazard themselves.