Mayors and chairs from the Horizons region are seeking an urgent meeting with Transport Minister Phil Twyford to progress an expressway between Ōtaki and Levin.
The funding needed to beef up State Highway 1 from Ōtaki to north of Levin is not available in this three-year period, and whether there will be enough in the next three years is unknown, New Zealand Transport Agency (NZTA) director of regional relationships Emma Speight said.
But Horizons Regional Council chairman Bruce Gordon said the group of mayors and chairs had offered NZTA several alternative ways to fund a four-lane expressway reaching from north of Ōtaki to the Waitarere curves north of Levin.
The group has a detailed analysis of population in the region and its transport infrastructure.
"No matter which way you look at it we get underfunded," Gordon said.