Why should ground controllers visually scan runways to the maximum extent possible?

Ground controllers are required to visually scan runways as a critical safety measure to prevent collisions. By maintaining a vigilant watch over the runways, controllers can quickly identify any hazards, such as vehicles, pedestrians, or other aircraft that could pose a risk during takeoff and landing operations. This proactive scanning helps ensure that the runway is clear before granting takeoff or landing clearances, significantly reducing the likelihood of accidents and enhancing overall operational safety within the airport environment. The emphasis on avoiding collisions aligns directly with the primary responsibility of ground controllers, which is to manage traffic safely and efficiently on the airport surface.