Emergency services were called to a crash on State Highway 1 north of Paraparaumu on the Kapiti Coast.

A two-car collision is causing major traffic problems on State Highway 1 through the Kapiti Coast.

The crash happened on the Waikanae straights, about 900m north of the Otaihanga roundabout.

Police said a person had to be cut free from a car with the jaws of life as a precaution due to a neck injury.

A Fairfax employee, stuck in traffic, said the backlog meant a drive that would normally be five minutes took 45 minutes.

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It was the third serious crash on SH1 running through the Kapiti Coast since Friday - causing traffic backlogs on the busy stretch of road north of Wellington.

On Friday a hot rod car and a truck collided on SH1 near The Fisherman's Table, Paekakariki, closing the road completely and forcing traffic to detour through Paekakariki Hill Rd.

On Saturday traffic again ground to a halt on SH1 to the south, near the Pukerua Bay lookout, when a car flipped onto its roof.