Police are advising motorists to avoid travel on State Highway 1 in the Wellington region due to a crash.

A car has crashed and flipped onto its roof about 1km north of Pukerua Bay.

Both lanes are currently closed.

Police expect to be in a position to open one lane shortly for northbound traffic to go around the crash site.

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Southbound traffic will be diverted over the Paekakariki Hill Road.