What does a steady red light from the Tower indicate?

A steady red light from the Tower indicates that vehicles or aircraft must stop and hold their position. This signal is critical for maintaining safety on the airfield, as it prevents accidents and ensures that all operations are properly managed. In the context of airside operations, a steady red light signifies that the area ahead is unsafe or that it is not the appropriate time for movement, allowing air traffic control to maintain the flow of traffic and provide clearance for takeoff or landing operations. Understanding and following this signal is essential for all airside vehicle operators to prevent potential collisions or disruptions in the air traffic system.