Auckland Transport said the section of the road is closed and drivers should avoid this area or allow extra time for a detour via Kennedy Rd.
“Stops on Dairy Flat Highway between Kennedy Road and Potter Road is closed due to emergency services incident until further notice.”
A Hato Hone St John spokesperson said they were notified of an incident on Dairy Flat Highway at 11:22am.
“We responded with one ambulance, two rapid response vehicles, an operations manager and a helicopter.
“We treated and transported one patient to Auckland City Hospital in a critical condition.”
One witness told the Herald there was a truck stopped, angled slightly to shoulder on the southbound side of the road.