The M1 at Cataract is now open to traffic following closure of one northbound lane earlier this morning due to a car fire.

The fire caused one northbound lane to be blocked which delayed Sydney commuters.

The Rural Fire Service first received a report of a car on fire about 6.21am Friday.

One truck attended the scene and extinguished the blaze about 7.05am. 

At 7.20am, traffic was banked back 500m from the scene.