Originally Posted by
wphamilton
In just a few states you can't even enter on yellow.
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Citation needed.
Originally Posted by
prathmann
So is precognition a requirement for driving in those states? How is the driver/cyclist supposed to know that the green light he's approaching is about to switch to yellow just before he crosses the stop line and enters the intersection. Some vehicle codes indicate that yellow is an indication to stop if possible but I'd be very surprised if any had a blanket prohibition on entering an intersection on a yellow light.
No.
I'd suspect that even in those states that allegedly prohibit it, the point (and how the law is enforced, if it is enforced) is prohibiting people from entering the intersection when it's definitely yellow (that is, when they could have chosen to stop). A fair number of drivers accelerate to go through the yellow. It seems clear that the (alleged) law is intended to discourage that.