Alternating red and green lights on the ground indicate what?

Alternating red and green lights on the ground are used to signal that pilots should exercise extreme caution. These lights are typically found in areas such as taxiways or where aircraft operations are ongoing. The combination of red and green alerts a pilot that there are potential hazards or that there is an active operation nearby that requires careful attention.

In contrast, other signals would convey different meanings. For example, a single red light could indicate to stop, while a continuous green light generally might suggest it's safe to proceed. Therefore, understanding the specific meaning of alternating red and green lights is crucial for maintaining safety during ground operations at an airport.