State Highway 1 at the Desert Road has been closed after a truck and trailer rolled and blocked the road on Monday.
The NZ Transport Agency says a detour is in place via State Highway 49 at Waiouru, SH44, SH47, SH46 and then back onto State Highway 1 at Rangipo.
The detour, which may be in place for several hours, will add at least 40 extra minutes to journeys through the area.
Police say nobody was injured in the crash.
Newshub.