Emergency road repairs following a truck crash early this morning are blocking northbound lanes on Auckland's motorway near the Nelson St off-ramp.

New Zealand Transport Agency warned of major delays and asked motorists to avoid the area if possible.

Two lanes will be closed to northbound traffic, leaving one lane open.

Traffic was crawling shortly before 9am between Greenlane and Nelson St with multiple lanes blocked.

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Police said there was debris on the road causing the lane between Wellington and Symonds St to close.

Another lane was expected to close while the road was cleared.

"Traffic is already backing up and motorists are advised to expect longer
delays than usual," police said

Commuters travelling north could use State Highway 16 or SH18 instead, the agency suggested.