The "Except Right Turn" sign may also be present in Oregon and Connecticut according to the blog Borden's Blather, but I cannot speak to that. If you can, please shed some light.

“At this intersection, there are two right turn lanes controlled by a traffic light,” Trooper Steve said. “Next to the traffic lights there is a sign that says, ‘Right on red after stop.’ ...

This road sign was first introduced to Britain nearly eight years ago. It reads 'no right turn except in two stages', but do you know what it actually indicates?

However, the practice is illegal at any intersection where there’s a sign saying it’s prohibited, the law states. Drivers also can’t turn right on a red arrow.