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This traffic light in Harrison, NY has been green for decades: https://www.google.com/maps/@41.0142226,-73.7217408,3a,75y,1... I have been driving through there since the late 70's and I'm pretty sure that the intersection configuration was in place earlier than that. So it's likely that this light has been green for over fifty years.

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I've been through there before and it makes sense. They want the whole exchange signalized for consistency but that one lane's configuration means it's protected.

I imagine you can make it red at the control box for an emergency or construction; I wonder if that's ever happened.

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