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List of Idaho State Highways
The Idaho Transportation Department is responsible for the establishment and classification of a state highway network which includes the interstate highways, U.S. highways, and state routes. These routes are listed below.
==History==
Instead of numbering its highways, Idaho had a system of lettered Sampson Trails in the 1920s.〔Rand McNally Auto Road Atlas, 1926, accessed via the (Broer Map Library )〕 They were marked by Charles B. Sampson of Boise at no expense to the state.〔Senate Concurrent Resolution No. 8, "a concurrent resolution...to permit Charles B. Sampson to extend the marking system of the Sampson Trail..." passed February 16, 1933〕 By the mid-1930s, the state had adopted a more standard system of numbered state highways.〔H.M. Gousha Company, (Western States road map ), published by Standard Oil Company of California, 1935〕〔Rand McNally and Company, (Road map: Idaho, Mont., Wyo. ), published by Texaco, 1937〕
The following trails were marked:〔
*A, Boise to Wyoming via Twin Falls and Pocatello; became US-30 and US-30N
*B, Boise to Canada via Lewiston and Coeur d'Alene; became US-30, US-30N, US-95, and SH-1
*C, Pocatello to Montana via Idaho Falls; became US-91 and US-191
*D, Boise to New Meadows via Banks; became SH-15 (today's SH-55)
*E, not on the 1926 map
*F, Boise to Blackfoot via Stanley; became SH-21, SH-17, US-93 (today's SH-75), and SH-27
*G, Mountain Home to Picabo via Fairfield; became SH-22 (today's US-20)
*H, Bliss to Trude via Arco; became SH-24, SH-23, SH-22, SH-29, and an unnumbered road (today's US-20 and US-26)
*I, Pioneer to Idaho Falls; became an unnumbered road
*J, Nevada to Shoshone via Twin Falls; became US-93
*K, Utah to McCammon via Preston; became US-91
*L, not on the 1926 map
*M, Washington to Montana via Coeur d'Alene; became US-10
*N, Bonners Ferry to Montana; became US-2
*O, Oregon to Caldwell; became SH-49 and SH-18
*P, Utah to Downey; became SH-36
*Q, Declo to Fairfield; became SH-25 and SH-46
*R, not on the 1926 map
*S, Oregon to Nampa; became unnumbered road and SH-45
*T, Star to Grimes Pass; became SH-16, unnumbered road, and SH-17
*U, Utah to Montpelier; became SH-35
*V, Hailey to Stanley; became US-93 (today's SH-75)
*W, not on the 1926 map
*X, not on the 1926 map
*Y, Bonners Ferry to Canada; became US-95
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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