What is the purpose of the runway exit sign when exiting the runway?

The purpose of the runway exit sign is to indicate the designation and direction of the exit taxiway from the runway. When an aircraft is landing or taking off, pilots need clear guidance to navigate safely from the runway to the taxiway. These signs help ensure that pilots are aware of the specific exit points available, aiding in the safe and orderly movement of aircraft on the airport surface. Properly identifying and following these signs is essential for maintaining efficient traffic flow and minimizing the risks associated with runway incursions or miscommunications with air traffic control.

The other options do not accurately describe the function of runway exit signs. For example, while information about control towers, runway availability, and taxiing speed might be critical for overall airport operations, they are provided through different signage and communication methods, not through runway exit signs.