All northbound lanes of the Hume Highway are closed at Sutton Forest due to a truck fire near Belanglo Road.
Motorists are advised to avoid the area.
Motorists can use the Illawarra Highway, Berrima Road, Taylor Avenue and Medway Road as an alternative route, and should allow extra travel time.
Emergency services are on site and traffic crews are also responding.
For the latest traffic information, visit www.livetraffic.com, download the Live Traffic NSW app or call 132 701.