stale green
n. A traffic light that has been green for a long time and so is likely to turn orange at any moment.

Example Citations:
Check for stale greens. “What‘s a stale green?“ Well — a fresh green is a green traffic light you know has just turned green — you were waiting for it or approaching it — you know it is going to stay green long enough for you to cross the intersection. Any other green light is a stale green, and may turn yellow as you cross.
—Cairn Macgregor, “Defensive-cycling techniques common sense,“ The Gazette (Montreal, Quebec), September 16, 1994

Stale green“ is a term used in transportation circles. It means the traffic light has been green a long time.
—“Action line,“ The Miami Herald, March 6, 1998

Earliest Citation:
Green traffic lights — May change (stale green).
—“Student driver education observation,“ Courier-Mail, September 16, 1986

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