“The Serious Crash Unit has been advised and motorists are advised to expect some delays while emergency services work at the scene,” a police spokesman said.
Emergency services remain at the crash site at the intersection of Old Railway and Old North Rds in Kumeū.
Hato Hone St John sent two ambulances, one rapid response unit, and a manager to the crash.
One person is in a serious condition and has been taken to North Shore Hospital. The four others have minor injuries and have been treated at the crash site.