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The United States Bicycle Route System (abbreviated USBRS) is the national cycling route network of the United States. It consists of interstate long-distance cycling routes that utilize multiple types of bicycling infrastructure, including off-road paths, bicycle lanes, and low-traffic roads. As with the complementary United States Numbered Highways system for motorists, each U.S. Bicycle Route is maintained by state and local governments. The USBRS is intended to eventually traverse the entire country, like the Dutch National Cycle Routes and the United Kingdom's National Cycle Network, yet at a scale similar to the EuroVelo network that spans Europe. The USBRS was established in 1978 by the American Association of State Highway and Transportation Officials (AASHTO), the same body that coordinates the numbering of Interstate highways and U.S. Routes. The first two U.S. Bicycle Routes were established in 1982 and remained the only two until 2011. Steady growth and interest in the system has followed since.〔〔 , 21 parent routes and six child routes extend across 23 states and the District of Columbia.〔 The system, once fully connected, is projected to encompass over of bike routes.〔 ==Layout== Like United States Numbered Highways and many national routing systems, the U.S. Bicycle Route system is designed to roughly follow a grid. Mainline routes are the major cross-country routes and are represented with one- or two-digit numbers. Even-numbered routes are planned to primarily run east-west, with low-numbered routes in the north and high-numbered routes in the south. Odd-numbered routes will primarily run north-south, with low-numbered routes starting in the east and ascending in number toward the west. Three-digit numbers are assigned to auxiliary routes, with the last two digits denoting the parent that the auxiliary connects to. Much like other routing systems, the grid is sometimes violated; for example, U.S. Bicycle Route 76 (USBR 76) is projected to turn to the north in Colorado and end in Oregon as opposed to California, south of (and temporarily concurrent with) USBR 20 but far north of USBR 50. The existing USBR 1 will be the easternmost route, though USBR 5 will run farther east of it in Virginia and the Carolinas. The westernmost and northernmost routes are USBR 97 and USBR 8, respectively, both of which are in the State of Alaska. Outside of Alaska, the westernmost route is expected to be USBR 95 and the northernmost USBR 10. USBR 90 is expected to be the southernmost route.〔 Despite the analogy the system has to the U.S. Highway system, the USBRS's route numbers do not necessarily trace the same route as the corresponding U.S. Highway number; for example, while USBR 1 will run close to the East Coast and thus parallel U.S. Route 1 (US 1), the projected route of USBR 10 generally follows US 2. In order for a route to qualify as a U.S. Bike Route, it needs to connect two or more states, connect multiple U.S. Bike Routes, or connect a U.S. Bike Route with a national border. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「United States Bicycle Route System」の詳細全文を読む スポンサード リンク
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