National's promising shovels in the ground in its first term for a second Mount Vic tunnel- if it gets the top job after the election.

Infrastructure spokesperson Chris Bishop says they'll get consents fast tracked.

He says it's good for buses, cars, walking, cycling, and it will decongest Wellington.

National says alongside upgrades to the Basin Reserve, it'll cost $2.2 billion dollars.

The proposal differs to Let's Get Wellington Moving, which would use one tunnel just for walking and cycling.

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