All lanes are now open following a crash on Auckland's southern motorway today, but drivers can still expect travel delays.

Earlier, three lanes were closed long the stretch of State Highway 1 near Manukau following the crash near the Reagan Rd over-bridge.

The New Zealand Transport Agency has since tweeted: "All lanes are now OPEN however delays remain in the area. Plan ahead for your journey."

Weekend traffic was backed-up for about four kilometres along the stretch of motorway which passes Otara and towards theme park Rainbow's End.

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The incident initially blocked two north-bound lanes while barrier damage also closed the right south-bound lane.

The NZTA is also continuing to warn of heavy traffic north of Auckland near Warkworth, and near the Brigham Creek roundabout to Kumeu.

Due to the heavy north-bound traffic from Puhoi to Warkworth, motorists are being advised to use the State Highway 16 to Wellsford route.