Traffic Lights

Does anybody know if there is a law on what color the pole of a traffic light in South Africa is.
This may sound like a sill question, considering they are all yellow, but even when another pole is used to hold the traffic light, it will be painted yellow.


Look here for example. The traffic light is attached to a street light, so the bottom part of it is painted yellow...

But now look here...

The traffic light is mounted on the pillar of the bridge, and the yellow "pole" is just painted on. It is not really there...