A truck carrying a 64m-long wind turbine blade has tipped on its side along State Highway 45 in Taranaki.
The truck slid into a ditch and tipped over shortly before 8am while negotiating a bend at the intersection with Hamption Road, south of Ōkato.
NZTA said one lane had been reopeneded on SH45, and a stop-go was in place.
A contractor has been called to lift the trailer out of the ditch.
The blade was being transported from Port Taranaki to the Waipipi Wind Farm near Waverly in South Taranaki.
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It was due to leave the port at 3am and arrive at Waipipi about 8am.