What do green lights on the center-line of a taxiway indicate?

Green lights on the center-line of a taxiway are specifically designed to indicate taxiway lighting. These lights are an integral part of the taxiway marking system, helping pilots navigate safely from the runway to the taxiway and vice versa, particularly during low visibility conditions or at night.

The green color helps to distinguish the taxiway from other airport surfaces, allowing pilots to understand their location and transition from one phase of ground movement to another. This function enhances safety and efficiency on the airport surface.

In contrast, the other options refer to different certain airport elements that do not correspond to the function of center-line taxiway lights. For instance, the end of the runway is marked with specific lighting patterns distinct from those found on taxiways, while an inactive runway would not typically use green lights in the same way as active taxiway lighting. Starting point of takeoff generally relates to runway markings and lights that serve a different purpose altogether.