The country's longest road tunnel has had two million vehicles through it in its first month.
The $1.4 billion Waterview Connection in Auckland opened on July 2 and has improved the commute of thousands of motorists, with more reliable travel times and traffic flows, according to the Minister of Transport Simon Bridges.
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Twin 2.4km-long three-lane tunnels connect State Highways 20 and 16 and took five years to build.
"About 60,000 vehicles are using the Waterview Connection each day," Mr Bridges says.
"People now have a choice between State Highway 1 and the Western Ring Route and that's helping to rebalance the city's travel demands and is making both the motorway system and local roads more efficient."
Travel demand on SH1 in Auckland has dropped 7 percent as the other two state highways get more use, Mr Bridges said, and journeys to the airport are also shorter.
Travel times between Papakura and the Auckland CBD is down to a consistent 56 minutes, from 70, while the evening commute the other way takes 48 minutes instead of 55.
"Motorists travelling around and through Auckland now have quicker trips with journey times more consistent and reliable," Mr Bridges said.