Three people have been injured after their car rolled on the Southern Motorway, near Newmarket in Auckland.
Traffic delays are likely after police closed the northbound lane at Greenlane.
Motorists are being advised to enter the motorway at Hobson St, Wellington St, or Shelley Beach Rd.
Police say the crash occurred at 7pm and the motorway is unlikely to be cleared until 8.30pm.
Injuries of the car's occupants ranged from minor to serious.
The Serious Crash Unit are investigating the crash.
Resource consent being denied for the Basin flyover is:Related story: Board of inquiry says 'NO' to Basin flyover