The Northern Gateway Toll Road, north of Auckland, has been awarded top honours at this year's Roading Excellence Awards.
The extension of State Highway 1 from Orewa to Puhoi won the Shell Bitumen Excellence Award for a Major Project and the Roading New Zealand Supreme Award.
Roading New Zealand says the $365 million project was one of the country's most challenging.
It says the road, which opened in January, is a showcase of environmental and engineering excellence.
Roading New Zealand's chief executive Chris Olsen says it demonstrates the New Zealand contracting industry's ability to successfully deliver complex projects.