It is illegal to enter an intersection when:

The traffic signal shows a green light, but a flagger tells you to stop.
It's already crowded and you can't clear it before the light turns red.
The traffic signal shows a flashing red light and you pass it without stopping first.
All of the above.
Explanation

Even if you have a green light, you must not enter an intersection if traffic ahead is backed up and you can’t get all the way through. Blocking the intersection is illegal and creates gridlock. Also, a flagger's instructions always override traffic signals, so if they tell you to stop-even on a green light-you must obey. A flashing red signal means the same as a STOP sign: you must come to a complete stop, yield as needed, and proceed only when it is safe.

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