This afternoon driving back from Hurstville about 3.00pm on King Georges rd Blakehurst, I noticed this just south of Terry st.

There are two separate, independant lights units, although the photo doesn't show that, but why there needs to be two, who knows, unless one is a spare.
How long the lights on the school zone sign haven't worked, I don't know, and why the unit has failed I don't know, maybe it needs more sun.
How many of the other flashing light units at the other 100 sites also fail