At least in California, I am almost positive that there is a standard on the minimum duration of yellow lights. It is based on the speed limit of the road in question. It may only be a standard for signals with red light cameras, I'm not sure. I recall a news article about an intersection with a red light camera up in the Bay Area, Union City to be exact. Apparently, someone got a ticket from the camera and fought it successfully by sitting at the intersection and measuring the yellow light duration. The duration was below the minimum duration based on the speed limit of the road and he got his ticket rescinded. Not only that, but everyone else who got a ticket at the intersection from the camera had there tickets rescinded as well. The city of Union City lost a ton of revenue.
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