Two crashes on Auckland motorways have resulted in traffic delays.

The first crash happened on the Northwestern Motorway near the Great North Road on-ramp.

The New Zealand Transport Agency said the left westbound lanes were blocked and delays should be expected.

Emergency services are attending, and are also at a second crash on the Northern Motorway.

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A crash has occurred between Esmonde Rd and Onewa Rd.

NZTA says the southbound lane is blocked after the Esmonde Rd on-ramp.

It is understood traffic is backed up as a result.

More soon.