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State Route 1 (SR 1) was a former state highway in Ohio. Its southern terminus was in Cincinnati, and its northern terminus was the Pennsylvania state line. ==History== SR 1 was not used for any Ohio highway again until 1961. After planning had been completed for the Ohio Turnpike and construction of the Turnpike was substantially underway, Ohio highway authorities began planning a second Ohio Turnpike extending southwest to northeast across the state. It was planned to run from Cincinnati to Conneaut and connect with an extension built across the panhandle of Pennsylvania to the New York State Thruway. As the highway was being planned, the Federal Aid Highway Act of 1956 was enacted, and the project was converted from a toll road to a free Interstate Highway. It was designated as SR 1, since the Interstate Highway numbering system had not yet been implemented. Portions of the freeway began to be completed and opened in 1959 with the new Interstate Highway funding, and they were later marked as SR 1 (the Interstate Highway numbers did not go up until 1962). Since large gaps existed along the corridor where no freeway had yet been completed, existing two-lane or four-lane highways were also designated as SR 1 in order to complete the route. SR 1 was rerouted as sections of Interstate opened. The SR 1 signage was removed in 1965 as the Interstate Highway numbers adequately marked the route and the state highway numbering was superfluous. The present day route of what was once planned as SR 1 is Interstate 71 from Cincinnati to just northeast of Medina, Interstate 271 for its entire length from northeast of Medina to Willoughby Hills, and Interstate 90 from Willoughby Hills to the Pennsylvania state line at Conneaut. Since 1965, there has been no highway designated as SR 1. 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「Ohio State Route 1 (1961–1965)」の詳細全文を読む スポンサード リンク
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