The Hume Highway is closed northbound in Liverpool due to a car fire near the M5.
Motorists are advised to avoid the area.
Traffic already in the area is being diverted onto De Meyrick Avenue, Reserve Road and then Graham Avenue to re-join the Hume Highway.
Traffic is heavy and is queued back more than two kilometres.
Motorists should allow plenty of extra time and expect delays.
Passengers catching buses in the area are also advised to allow plenty of additional travel time.
Emergency services and traffic crews are on site working to put the fire out.
For the latest traffic information, visit www.livetraffic.com or call 132 701.
For the latest transport information, visit www.transportnsw.info.