Motorized vehicles have been prohibited on the island since 1898, with the exception of snowmobiles during winter, emergency vehicles, and service vehicles. Travel on the island is either by foot, bicycle, or horse-drawn carriage. Roller skates and roller blades are also allowed, except in the downtown area. Bicycles, roller skates/roller blades, carriages, and saddle horses are available for rent. An 8-mile (13 km) road follows the island’s perimeter, and numerous roads, trails and paths cover the interior. The road encircling the island and closely hugging the shoreline is M-185, the United States’ only state highway without motorized vehicles.