“A second person has reportedly sustained moderate injuries.
“The road remains closed while the Serious Crash Unit examines the scene. Motorists should continue to avoid the area.”
Diversions are in place at the intersection of SH2 and SH25 to the north, and SH2 and SH27 to the south.
A Hato Hone St John spokesperson said an ambulance, one road manager and a helicopter were sent to the crash scene.
Staff assessed one person in a moderate condition.