One lane of the main highway north of Wellsford is now open after a truck and trailer crash early this morning.
A crane is being brought in to right the large truck after it rolled on SH1 at Brynderwyn about 4am.
Motorists are being warned to expect queues and delays while traffic is ushered past the crash site by stop/go signs on the northbound passing lane.
Police said a truck and trailer unit rolled between Baldrock Rd and SH12. The driver suffered moderate injuries.
The highway was closed to allow a crane to be brought in to right the truck and trailer.
It is not yet known when it will be fully reopened.