When you see an alternating red and green light from the light gun, what should you do?

When you see an alternating red and green light from the light gun, it indicates that the controller is communicating a signal that requires you to exercise extreme caution. This specific light signal is typically used to alert pilots and drivers of potential hazards or situations that necessitate careful observation and awareness of your surroundings.

In the context of airfield operations, exercising extreme caution means being vigilant about any developments in the vicinity that may affect your safety. This might involve being on the lookout for other vehicles, aircraft movements, or instructions from air traffic control. It is important to remain responsive and prepared to react appropriately to any changes in the situation ahead, especially as conditions can quickly evolve in an airfield environment.