What does a steady green light at a controlled airport indicate?

A steady green light at a controlled airport indicates that an aircraft is cleared for takeoff. In the context of airport operations, this means the pilot has received permission to proceed down the runway for departure. This signal is critical for ensuring safe and efficient operations, allowing pilots to confirm they are ready to take off without additional clearance.

While other signals exist for various operations, the steady green light specifically denotes that everything is clear for the aircraft to begin its takeoff sequence. It's important for pilots to always be aware of the meaning behind these light signals to adhere to safety protocols and maintain communication with air traffic control effectively.