A truck crash has closed a major road linking Manawatu with Tararua District.

Motorists are being warned to delay their travel after a truck crash blocked the Pahiatua Track near the intersection of Ridge Rd about 9.15am.

Part of the truck remained upright but its trailer was upturned.

A police spokesman said the trailer was empty when it flipped.

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A crane was on its way from neighbouring Palmerston North to right the wrecked vehicle.

Traffic was now being diverted on Ballance Rd around the crash.

The alternative Saddle Rd pass remains open.

It was expected to take several hours to clear the wreckage.