The motorway has since reopened, and the delays have eased.
Earlier, a crash on a busy motorway and a breakdown on another caused rush-hour chaos for evening commuters.
A car had broken down on the northbound side of the Auckland Harbour bridge, blocking one lane. The breakdown has now been cleared.
A crash was blocking the two right-hand lanes on the eastbound side of the Northwestern Motorway. It was positioned between the Patiki Rd and Rosebank Rd exits.
The crash has since been cleared.
Waka Kotahi were advising evening commuters to pass the scene with care and expect delays.
A crash was also blocking the second lane northbound on the Mangere Bridge at 6.30pm.