The Northern Road is closed in both directions near Littlefields Road in Luddenham due to a two-car crash.
Live Traffic Sydney is reporting that people are trapped.
Commuters are urged to avoid the area as the only diversion is Mulgoa Road.
LUDDENHAM: The Northern Rd is closed in both directions near Littlefields Rd due to a two-car crash. Persons are trapped. Avoid the area as there are no diversions at this stage. pic.twitter.com/wFT6ltfdJC
— Live Traffic Sydney (@LiveTrafficSyd) August 5, 2019