A truck has rolled over on the Federal Highway, just north of the ACT border.
The truck, which was travelling southbound, rolled over just before 7am on Monday near Sutton.
The driver was treated by paramedics for minor head injuries.
Many of the packages the truck was carrying were seen strewn out on the side of the road near the site of the incident.
One southbound lane has been closed in between Sutton and the ACT border.
A NSW Police spokeswoman said the lane was likely to be closed for several hours as the site was cleared.
Drivers have been urged to avoid the area if possible.