Police are attending a serious crash north of Huntly.
The crash occurred at approximately 1.10pm near the intersection of State Highway 1 and Fisher Road.
Diversions are in place at Tainui Bridge and East Mine Road.
"Heavy vehicles cannot go on Tainui Bridge so there will be significant delays for trucks and other heavy vehicles," says police.
"Police ask motorists for their patience at this time while the Serious Crash Unit investigates the crash and to avoid the area at this time."
Police do not have details of injuries at this time.