A multiple-vehicle crash on State Highway 1 near Ohau caused delays for motorists on Thursday.
Police said four vehicles were involved in the crash which happened at about 1.45pm and initially closed the northbound lane of the road.
A St John Ambulance spokesperson said four people had been treated at the scene for minor injuries.
A police spokesperson said three of the cars needed towing.
The stretch of highway south of Levin passing through Ohau and Manakau has been the site of several crashes in recent months.