The Pacific Highway is closed northbound at Woolgoolga (north of Coffs Harbour) due to a truck rollover near Greys Road.
Northbound traffic is being diverted via Solitary Islands Way and returning to the highway at Arrawarra.
The diversion is suitable for all vehicles.
Emergency services are on site while traffic crews are attending.
Motorists are advised to follow directions of crews in the area and allow some extra travel time.
For the latest traffic information, download the Live Traffic NSW app, visit www.livetraffic.com or call 132 701.