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A police spokeswoman said emergency services were deployed to the crash 300m south of the town near Dunedin on State Highway 1 about 3.50pm.
The white people-mover had rolled but its driver was not trapped and appeared to be uninjured.
Traffic control remained in place about 4.20pm and the road was blocked, while a detour via Mt Cargill remained in place.
A tow truck had been deployed.