Creating the Mackays to Peka Peka Expressway into something special required clear goals from the outset, project manager John Palm said.
Mr Palm, a guest speaker during a ceremony held on the new Waikanae River bridge on Thursday morning to mark the completion of the expressway, said the project was "earmarked as unconsentable" at the start.
But when it was consented, after a few years of hard work and engagement with experts, the Mackays to Peka Peka Alliance got together and "came up with a vision for this project".
"They gave us clear goals and aims which we needed to do to construct this project."
The project needed to be well planned, embrace new technology, be completed early, have established landscapes, leave a positive legacy, use local resources and enrich the community, and create safer journeys.