Originally Posted by Big Tommy C
You contradict yourself.
A vehicle has to have the right-of-way for the entire time it will be in an intersection. If I start turning and the light turns red while I'm in the intersection, I can be ticketed for running a red light.
This is a sticky one, a cop can easily say you didn't start turning until it went red and it'll be very hard to fight. A judge (when fighting) might not like "I was trying to beat it, so I am sure it was yellow" as your defense.
If you are in the intersection while the light is green, you're OK to turn (example if you are blocking traffic and a few cars run the red leaving you sitting at a red in the middle of the street). If you are not in the intersection before the yellow, you should wait for the next green.