Hundreds of homes have been spared from demolition after the NSW government backed down on its plans to earmark new western Sydney road corridors for future development.

Following a groundswell of community outrage, the Berejiklian government announced on Friday it had ditched plans to preserve new sections of the Bells Line of Road corridor and the Outer Sydney Orbital corridor for future motorways slated for construction in 40 years time.

Hundreds of properties will still be acquired in future decades to make way for the 130 kilometres of corridors, which the government said were necessary for the anticipated explosion of western Sydney's population.

However, the backflip will reduce the number of affected properties from 1247 to 825, while the number of homes affected will be halved from 399 to 200.