From the back of a Gregory’s Street Directory by the look of things, and very much in their house style. I’m not sure this map is actually helping things that much: Sydney’s labyrinthine network of streets is partially to blame, but the flow of arrows and lines could also be much clearer.

The strange decision to make the background black for the second half of the suburb list (to the right of the map) has the unfortunate side effect of making that half look like a list of night time services.

The other thing to note is that there is a ridiculous number of bus routes serving downtown Sydney.

Source: Nick (kypros1992)/Flickr – link no longer active