Traffic is being diverted off the motorway north of the crash along East Coast Bays Road.
The Serious Crash Investigation Unit is at the scene and police are working to clear the motorway as soon as possible.
Police are appealing for witnesses who saw the motorcycle before the accident or the crash itself. People with information should contact *555 or the Waitemata Serious Crash Investigation Unit on 09 481 0300.
Meanwhile one person has been seriously injured after two cars collided in South Auckland this morning.
Emergency services were called to the accident at the intersection of Redoubt Road and
Mill Road in Totara Park about 6am.
The Serious Crash Unit is investigating.
Detours are in place at the intersection of Mill and Ranfurly, and Redoubt and Murphy roads.