Police say a serious crash has closed State Highway 2 near Bombay, south of Auckland.
The crash happened just east of the intersection with State Highway 1.
Police said traffic diversions were in place along Koheroa Rd and Island Block Rd.
Heavy motor vehicle drivers were advised to use Island Block Rd or "other suitable routes".
Police urged motorists returning to Auckland from the Coromandel or Bay of Plenty to either delay their journey or use alternative routes away from the crash.