South Pole Traverse 

https://www.dangerousroads.org/south-america/antarctica/1995-south-pole-traverse.html

South Pole Traverse, also called the McMurdo-South Pole Highway, is the world’s southernmost road. With a length of 1,600 kilometers (995 miles) over the Antarctic ice sheet, this compacted snow road links the McMurdo Station and the Amundsen–Scott South Pole Station. The South Pole Traverse is not paved. The highway was created by filling in deep crevasses in the Antarctic ice sheet. The only vehicles on the highway are specialized tractors equipped with specialized towing sleds. Construction started during the 2002/03 southern summer field season. It was finished in the 2005/2006 southern summer.Construction on the Traverse was inaugurated in late 2002 (the polar summer from October to February is the only time construction is feasible), budgeted at a cost of US$350 million. This road needs maintenance each season. The section caused much more construction work than planned, due to the fact that the ice sheets are likely to shift.  The road is extremely dangerous, tedious and of course, very very isolated. This snow road was constructed by leveling snow and filling in crevasses, but is not paved; flags mark its route. It takes about 40 days for supplies to reach the pole from McMurdo, but the route is far more reliable and inexpensive than air flights. The highway can also supply much heavier equipment (such as that needed by the South Pole's astrophysics laboratories) than aircraft. The return trip to McMurdo Station, with less fuel and cargo, is substantially quicker. After four years of development, the trail is now operational, with Caterpillar and Case Corp.tractors pulling specialized sleds to deliver fuel and cargo to the South Pole. The McMurdo Ice Shelf and the Antarctic Plateau are relatively stable. Most crevasses occur in the short steep shear zone between them, where the road climbs to more than 2,000 metres (6,600 ft) above sea level.