A crash on Auckland Harbour Bridge has caused traffic to back up through to Spaghetti Junction.
Police say a motorcyclist was injured in a collision with a truck and emergency services were at the scene.
The rider has been taken to hospital in a serious condition.
The crash took place about 10.15am and is blocking the centre-most northbound lane, according to Waka Kotahi New Zealand Transport Agency.
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"Traffic is now heavy northbound between the CMJ and Auckland Harbour Bridge, with only two lanes open for northbound motorists. Consider using an alternative route as this lane may be blocked for sometime," NZTA said.
They asked people to pass the scene with care and expect delays.
St John Ambulance said a person suffered serious injuries in the crash and was transported to Auckland City Hospital.
The crash had been cleared by 11.10am but traffic was still heavy through to the junction with at least a 12 minute delay expected.