What does alternating red and green indicate on the airfield?

What does alternating red and green indicate on the airfield?

• A. Proceed with normal operations
• B. Exercise Extreme Caution
• C. Authorized vehicle path
• D. Full stop and hold

Answer: (B)

Alternating red and green signals are used to indicate you must exercise extreme caution. The changing pattern signals that normal operations aren’t in effect, so you should slow down, stay alert for other traffic or aircraft, and be prepared to stop or follow directions from a controller. This is different from steady green (proceed normally along an approved path), steady red (stop), or a dedicated authorized vehicle path (which is indicated by specific signals or markings).

Alternating red and green signals are used to indicate you must exercise extreme caution. The changing pattern signals that normal operations aren’t in effect, so you should slow down, stay alert for other traffic or aircraft, and be prepared to stop or follow directions from a controller. This is different from steady green (proceed normally along an approved path), steady red (stop), or a dedicated authorized vehicle path (which is indicated by specific signals or markings).