The first fully-sealed purpose-built circuit not based on an airfield circuit was Altona, near Melbourne...

This was essentially the shallow dry area around a little lake called Cherry Lake and it as sealed for racing in 1953. But Mount Druitt had preceded this, with the proviso that it used an airstrip as its main straight, a year or to earlier. Of it's 2.2 or 2.4 miles, perhaps a mile as on the old airstrip, the rest was purpose-built and sealed for racing.

It wasn't long before a wet season saw this flooded and within three or four years it was beyond repair.

Phillip Island came in 1956, but there were plenty of fully-sealed airstrip circuits around which used the strip and taxiways or service roads to complete the circuit. Mooliabeenie and Caversham had the main strip and what was called a dispersal road joining one end to the other and going off into the bush. These were intended for use during the war to hide aircraft under the trees.

Nowra - 1946. Caversham - 1946. Lowood - 1948. Mooliabeenie - 1950.