Motorists in the Upper Hutt area are asked to expect delays following a serious crash on State Highway 2 between a car and a motorcycle.
Waka Kotahi NZTA said the crash occurred about 2.40pm south of Kaitoke Loop Rd.
An ambulance was on site and a helicopter is en route.
They asked motorists to slow down and expect some delays.
Police confirmed the road at Kaitoke was closed due to a crash between a car and a motorcycle, and that initial reports show one person has suffered serious injuries.