What key indicators should a Ramp Marshal monitor when an aircraft is taxiing?

When an aircraft is taxiing, it is essential for a Ramp Marshal to monitor key indicators related to the aircraft's operation and safety. This includes the aircraft's speed, ensuring it remains within the designated limits for taxiing. Monitoring proximity to other vehicles and aircraft is crucial to avoid collisions and ensure safe movement on the ground. Additionally, the proper use of lights indicates the aircraft's intentions and enhances visibility to other ground personnel and vehicles, contributing to overall safety during taxiing operations. These factors are critical in maintaining safe and efficient ground operations in a busy airport environment.