Several years ago, this column unwittingly dived into the rabbit hole of so-called "ghost" roads - transport corridors that appear on maps but not on the ground. The resulting long list of these phantom roads included the circular network of roads at the planned - but long abandoned - 1920s Environa estate near Hume.
Then there are those roads that once were busy thoroughfares but are no more, like Lavarack Road that runs on the lower slopes of Mt Pleasant near the Royal Military College of Duntroon, that once connected Queanbeyan to Hall and beyond to Yass.