Diversions are in place following a serious crash on State Highway 1 south of Whangarei.
A truck rolled on SH1 near Oaks Rd just before 6pm, about 8km south of Whangarei, police said.
A police spokesperson said the driver was trapped and in a critical condition.
Fire Emergency New Zealand were still trying to extracate the man at 9pm
Light traffic is being diverted down Loop Rd, but the diversion is not suitable for heavy traffic.