Multiple crashes on Auckland motorways are causing early delays for motorists heading into town this morning.

A crash on the Southern Motorway is blocking the right southbound lane just after the Penrose Rd overbridge.

Motorists are asked to merge left past the crash site and be prepared for delays in both directions.

Another crash at 7.15am partly blocked the Southern Motorway's northbound Princes Street on-ramp, the NZ Transport Agency said. Commuters were warned to expect minor delays and consider alternative routes.

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Earlier emergency services were called to two different incidents on State Highway 16 near the St Lukes offramp about 6.15am.

Both crashes were cleared about half an hour later.

However, motorists are being warned to expect delays in the area as the congestion that quickly built after the crashes eases slowly.

The NZ Transport Agency reported that eastbound lanes had been blocked due to the incidents and drivers were told to take care when passing and to prepare for some delays.

It is not yet known whether anyone has been injured in either crash.