The plan's key elements were a green belt around Sydney and a radial motorway network, neither of which eventuated on their intended scale.
The Cumberland Plan was developed by the council's chairman John Percival Tate and chief planner Sidney Luker.
Suburban development in the early 20th century followed a 'starfish' pattern, closely tied to the railway and tramway lines that radiated from the centre.
The plan was resisted by NSW Government agencies, landowners and local residents and lost its patron when the county council was abolished in 1963.
Motorists travelling north on the Cumberland Highway would have seen, with a few exceptions around Liverpool and Toongabbie, only green space to their left.