UPDATE 11.45: Police have confiremd State Highway 1 has reopened. The surface has been swept but police are continuing to warn motorists to take care in the wet conditions.
Police have issued a warning to motorists to slow down in the wet and watch their following distances after a four-vehicle crash that blocked State Highway One north of Whangarei.
SH1 will be closed until around 10.30am, and traffic diverted through Hikurangi, after a crash involving two trucks and two cars about 8.30am this morning.
Police said an initial scene examination indicated a south-bound truck and trailer unit carrying large bales of silage was waiting to turn right into Jordan Valley Rd.
As it was giving way to north-bound traffic two cars travelling behind the truck were involved in a nose-to-tail crash.