Motorists heading north on the M1 Pacific Motorway can expect delays as emergency services deal with a truck crash and fire at Mount White.

A semi-trailer loaded with paper ran off the motorway through a guard rail and into the bush just after 1.00am on Wednesday, about 1km south of the weigh station.

The rig burst into flames, with the fire spreading to nearby bushland.

The driver managed to escape but he’s been taken to hospital with minor injuries.

One of three northbound lanes are closed as the cleanup and salvage operation gets under way.

The mangled wreck of the burnt out truck. Picture Kariong RFS