The long-awaited Transmission Gully route is to go ahead as part of a $2.2 billion upgrade of State Highway 1 from Wellington to Levin.

Transport Minister Steven Joyce this morning confirmed the project would go ahead as one of the Government's roads of national significance.

Also announced was a NZ Transport Agency (NZTA) plan to upgrade SH1 between Wellington and Levin to reduce congestion, improve safety and support economic growth.

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