At 4.40pm the Agency said traffic was tailed back to Loney Track Rd north of Auckland.
A police spokesperson said there were no information about any injuries.
A sheep gets a better look at traffic numbers on the Southern Motorway. Photo / Sarah DoncasterOn the other side of town, northbound motorists on the Southern Motorway were welcomed by heavy traffic and delays between Drury and Takanini.
Sarah Doncaster was travelling north on the Southern when she noticed another commuter who became fed up with the waiting.
Posting a photo to Facebook, Doncaster said: "Traffic is bit slow on the southern this evening. Even the cargo got annoyed with it."