Epsom MP David Seymour says the authority which is planning to ban cars from the summit of Mt Eden has no evidence to support one of its central claims that vehicles are contributing to erosion at the tourist spot.
Mr Seymour also said the Maunga Authority which oversees Auckland's volcanic cones did not appear to have consulted with the public before extending a ban on heavy vehicles to all cars, which was likely to be enforced by the end of the year.
The Maunga Authority has cited several reasons for the imminent ban, including pedestrian safety, congestion, damage to the mountain, and the preservation of a sacred site.
Mr Seymour, whose electorate includes Mt Eden, questioned some of the reasons for the ban. The Act Party leader asked the authority under the Local Government Official Information and Meetings Act for any reports on measurements or estimates of damage caused by vehicles.
The authority's lead officer, Justine Smith, responded by saying unrestricted access had "raised concerns" about damage to the mountain.