Fantastic assortment of photos there!
I like the 12" arrows and 8" ball setups, makes for some interesting designs.
That Aldridge Guy wrote:Adelaide children's bike & traffic safety school, 1974.

An interesting thing to note here is the Tin lantern on the reverse of the post.
Not sure how common it was in Aus, but over here they never seemed to mix SGE heads and Tin heads on the same pole or even on the same installation.