A two-vehicle crash has closed State Highway 58 near Porirua and transport authories are warning of traffic delays.
Five people were injured, two seriously, in the crash between a car and a truck on SH58 at Paremata, just after 8am.
Police are asking motorists to use SH1 and SH2 as alternative routes.
Diversions are in place at the SH2 and SH58 intersection in the Hutt Valley and at the Pauatahanui roundabout.
The Transport Agency is advising motorists to allow for extra travel time.