The New Zealand Transport Agency has begun engaging local iwi while work pending redesignation of Mangakahia Rd as a state highway is under way.
A powhiri will be held at the Poroti Marae today for NZTA officials and other stakeholders before a meeting to discuss the redesignation, including an open discussion.
The meeting will finish with a bus tour from Loop Rd to the Twin Bridges on Mangakahia Rd.
The bus tour will end at Parahaki Marae and each marae is expected to nominate representatives for the meeting.
"The bus tour is an information gathering and listening exercise to understand the cultural values and history within the area as we work towards designating the road as a state highway," NZTA spokeswoman for Northland and Auckland, Sarah Azam, said.