What must personnel operating in the controlled movement area have for safety?

Personnel operating in the controlled movement area must have two-way radio contact with the control tower for safety because effective communication is crucial in aviation environments. The controlled movement area is where aircraft are taxiing, taking off, or landing, and it is imperative that all ground movements are coordinated. Establishing two-way radio communication with the control tower ensures that these personnel can receive necessary instructions and advisories regarding air traffic and airport operations. This way, they can respond promptly to changing conditions or directives, reducing the risk of accidents and enhancing overall safety on the airfield.

Other measures such as displaying identification badges, having visible training certification, or using a buddy system can contribute to safety, but they do not provide the immediate communication needed to navigate the dynamic environment of the controlled movement area effectively.