A truck driver is seriously injured after their vehicle rolled on State Highway 1 north of Herbert this morning.
A police spokeswoman said emergency services were called to the single-vehicle crash at 8.06am.
The truck driver was in a serious condition and was being airlifted to hospital.
The Waitaki District Council was arranging contractors to assist with traffic management, and diversions were in place, the spokeswoman said.
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Network Waitaki had been notified of damage to power lines.
Motorists have been warned to expect delays.