These are Stobie poles. Anyone who has travelled in South Australia will immediately recognise it.
They were designed by James Stobie. South Australia has very little timbered areas, so wood for long, straight poles was almost non-existent. He created these poles with metal and concrete. The first one was erected in South Terrace, Adelaide in 1924. Now they are to be seen everywhere throughout the state.
Now you can stun all your friends with another piece of trivia!