I think, as lezurex says, the traffic lights are required by law, even if they are kinf of obsolete.

What I find much trickier is the indirect left turn at 2 separate traffic lights. If the light is green to the right but red straight ahead, I may not be able to line up on the road (from the right) because it has green at the same time. I would then have to wait on the centre of the crossing. However, I don't intuitively expect the cars to have the green light when I myself explicitly have the green light.
This may be clearly regulated by law, but in practice many people may not be aware of it or may misinterpret it.

Orange flashing is not legal as far as I know (and it'd also mean the traffic signal is out of service). But I don't think it's confusing anyway: The red turn plate is standardised nationwide.