A series of crashes on Auckland's Northern Motorway has resulted in two lanes being blocked, causing delays.

The New Zealand Transport Agency is reporting that an incident on the Auckland Harbour Bridge is blocking the right-hand lane of the motorway heading north.

A crash before Oteha Valley Rd has also resulted in the right southbound lane being blocked.

The crashes may cause disruptions to those traveling to the Blues and Hurricanes preseason game at Warkworth today.

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The transport agency tells motorists to expect delays in both areas and to pass with care.