 State Highway 1 passes north-south through the middle of the city, linking Porirua southwards to Wellington and northwards to the Kapiti Coast and the bulk of the North Island.Porirua is the northern terminus of the Johnsonville-Porirua motorway (opened progressively from 1950), which forms part of State Highway 1.State Highway 58 links Paremata via Whitby and Pauatahanui with Haywards in the Hutt Valley to the east.