A North Shore highway is reopened after armed police raided a suspected clan meth lab.

Police closed Albany Highway from Sunset Road to Upper Harbour Highway during rush hour this morning as they executed a search warrant at a property.

No further details of the pre-dawn operation were available.

Auckland Transport said the road was now clear to travel on but people using the affected roads could still expect delays.

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The main highway through the northern suburb was reopened just after 7.15am.

Meanwhile, traffic is backing up on Auckland's Southern Motorway after a crash.

The New Zealand Transport Agency said the crash was blocking the left lane southbound after the Takanini on-ramp. Motorists should expect delays from Hill Rd.