Man cut from van after Auckland motorway crash

The scene of the crash on Auckland's Southern Motorway. Photo / nzherald.co.nz

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A man with serious leg injuries has been cut from a van in a crash causing long delays on the Southern Motorway in Auckland.

The injured man was driving the van that hit the back of a truck on the southbound Mt Wellington motorway off-ramp at about 3pm, a witness says.

He was trapped with crushing injuries to his legs but a young passenger escaped with moderate abdominal injuries, he says.

Police say a "significant" amount of traffic has backed up as emergency services work to clear the crash site.

They are advising motorists to avoid the area if possible.