[diggernet]

Obviously my wording was poor. If the light turns while you are still in the intersection, you've earned a ticket.

In both states, you are supposed to not enter the intersection unless you have both time and space to make it through. In Oregon, intersections tend to stay clear more, because people generally follow that rule more. In California, if the light is yellow and traffic is stopped on the other side, many people will enter anyway, knowing they can't go through, just to claim their "turn". And totally block traffic when the light changes. Not so much in Oregon.