The highway, which directly parallels the pipeline, is one of the most isolated roads in the United States. There are only three towns along the route: Coldfoot at Mile 175, Wiseman at Mile 188, and Deadhorse at the end of the highway at Mile 414. Fuel is available at the E. L. Patton Yukon River Bridge, as well as Coldfoot and Deadhorse. Two other settlements, Prospect Creek and Galbraith Lake, are uninhabited except for campers and other short-term residents. The road itself is mostly gravel, very primitive in places, and small vehicle and motorcycle traffic carries significant risk. The nearest medical facilities are in Fairbanks and Deadhorse. Anyone embarking on a journey on the Dalton is encouraged to bring survival gear. Despite its remoteness, the Dalton Highway carries a good amount of truck traffic through to Prudhoe Bay: about 160 trucks daily in the summer months and 250 trucks daily in the winter. The highway comes to within a few miles of the Arctic Ocean. Beyond the highway's terminus at Deadhorse are private roads owned by oil companies, which are restricted to authorized vehicles only. There are, however, commercial tours that take people to the Arctic Ocean. All vehicles must take extreme precaution when driving on the road, and drive with headlights on at all times. There are quite a few steep grades along the route, as well. As of July 2013, of the highway are paved, in several sections, between the following mileages: 19 and 24; 37 and 50; 91 and 111; 113 and 197; 257 and 261; 344 and 352; and 356 and 361. Truckers on the Dalton have given their own names to its various features, including: The Taps, The Shelf, The Bluffs, Oil Spill hill, Beaver Slide, Two and a Half Mile, Oh Shit Corner, and the Roller Coaster. The road reaches its highest elevation as it crosses the Brooks Range at Atigun Pass, 4,739 feet. The highway is the featured road on the third, fourth, fifth and sixth seasons of the Historyreality television seriesIce Road Truckers, which aired May 31, 2009 to present. It is also the subject of the second episode of America's Toughest Jobs and the first episode of the BBC's World's Most Dangerous Roads featuring Charley Boorman and Sue Perkins. Polar bears are known to traverse the Arctic region of Alaska and can be seen wandering the outskirts of the Dalton Highway. If that occurs, the Alaska DOT will shut down the road in the presence of polar bears. The wandering is an indication that a polar bear is on the hunt and has been known to attack people in defense or even prey. Google Street View has coverage of nearly the entire highway, which can now be seen on Google Maps. It is one of the most northerly routes of Google street view in North America. Recent flooding of the Sagavanirktok River, combined with melting of nearby ice roads under warmer climatic conditions have forced weeks-long closures of the road and the need for significant repairs, costing several million US dollars.