What signal indicates that an aircraft is cleared for takeoff when on the ground?

A steady green signal is used to indicate that an aircraft is cleared for takeoff while on the ground. This signal instructs the pilot that it is safe to proceed with the takeoff. Ground operations rely on a system of visual signals to manage traffic effectively and ensure safety in the airport environment.

The steady green specifically communicates to the pilot that permission has been granted to continue. Other signals hold different meanings: for example, a steady red indicates stop, and flashing yellow signals caution, typically instructing pilots to be prepared to follow instructions or take necessary action. Thus, the steady green signal is crucial for clear communication between air traffic control and pilots, ensuring safe and efficient airport operations.