State Highway 1, north of Auckland, is blocked due to a truck rollover.
A police spokesperson said a truck rolled at 10.15am on Monday, blocking lanes in both directions near the intersections with Schiska and Otioro Roads near Topuni.
So far there were no reports of any injuries.
Diversions were in place for northbound and southbound traffic, the spokesperson said.
Motorists should expect delays while the scene is cleared.
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