The 85-year-old New Zealand mountaineer says the road, now half-finished, will ruin the journey to the South Pole.
"I'm very strongly opposed to it," Hillary told the Wellington, N.Z.-based Dominion Post newspaper. "I think they ought to continue using their aircraft as they have done for years and years."
The purpose of the 1,000-mile road is to link McMurdo Station on the Antarctic coast to the Amundsen-Scott base, freeing up ski-equipped supply planes for other missions.
Hillary also criticized Great Britain for neglecting the historic huts used by early explorers of Antarctica. The huts are being threatened by advancing glaciers.
Swim Week Miami Beach 2014 [PHOTOS]