Travelers would be classified into one of three groups: green for good to go, yellow for investigate further and red for stop from flying.
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Pilots are instructed to land at the nearest possible suitable airport in the event of a Code Red. Hearing Code Red at the terminal typically means there's a confirmed security risk, such as a bomb or terrorist. Airport security and police are almost immediately mobilized to deal with the situation.
Threshold lights are green color airfield lights, unidirectional type, installed at the beginning of the part of a runway where aircraft can do touchdown. Threshold is not a touchdown point yet. But this is a beginning of 'safe-to-land' part of a runway.
®A Code Green is a behavioral. emergency and/or an incident. needing physical support and presence when an individual poses a threat to himself/herself or others.