A school bus driver has been thrown through a windscreen after a collision with a truck north of Wellsford this morning.

Fire Service northern communications manager Dallas Ramsay said the bus was hit from behind by a truck on State Highway 1 between Wellsford and Te Hana just after 7.15am.

The driver of the bus was hurled through the windscreen on impact.

The bus was not carrying any passengers.

A St John Ambulance spokeswoman said one person suffered moderate injuries in the crash.

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The accident caused major traffic congestion on the northern highway.

One lane was closed and vehicles were streaming past the crash in single file. Drivers were warned to expect delays.