A car has flipped on the Southern Motorway causing traffic delays for motorists in peak hour.
Police are now trying to locate a fleeing driver.
The crash, northbound near Otahuhu, occurred at at 5.42am when a vehicle crossed two lanes, causing another two cars to collide, one of which has flipped, police said.
The vehicle which crossed the two lanes left the scene and police are trying to locate the driver.
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No one has been seriously injured.
All three lanes are open but there are delays for motorists.
The New Zealand Transport Agency said travel times via State highway 1 are "significantly higher". It asked motorists to consider travelling from Manukau to the city via SH20/16.
Earlier, NZTA said a crash is blocking a lane on SH1, just south of Wellsford currently. Motorists were asked to delay their journey until cleared or allow extra time.
There was also a breakdown on the Harbour Bridge which blocked a northbound lane.