A crash on a major Auckland Motorway has led to debris spilling out over the road, causing major traffic disruptions for Auckland commuters.

The crash on State Highway 1 northbound just before the Takanini off-ramp left a trailer on its side and closed down two lanes.

A police spokesperson said one person has suffered moderate injuries.

According to Google Maps, it is taking motorists 40 minutes to complete the 6.4km stretch of road before the crash.

Waka Kotahi NZ Transport Agency is advising motorists to pass the crash site with care and to expect delays.