The northbound lanes of State Highway 1 out of Wellington have re-opened this morning, after a person was killed on the motorway in an accident.

The NZ Transport Agency said on Twitter just before 6am today that the motorway lanes had been re-opened overnight.

The person died just before the Ngauranga Gorge after being hit by a vehicle just before 6.30pm yesterday, police said.

Traffic was diverted off the northbound motorway lanes at the Tinakori Rd off-ramp.

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The Serious Crash Unit is investigating.

- Staff reporter, AAP