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Pennsylvania State Route System : ウィキペディア英語版
Pennsylvania State Route System
In the U.S. state of Pennsylvania, state highways are maintained by the Pennsylvania Department of Transportation. Each is assigned a four-digit State Route (SR) number in the present Location Referencing System. Traffic Routes are signed as Interstate Highways, U.S. Routes and Pennsylvania Routes (PA Routes), and are prefixed with one to three zeros to give a four-digit number. PA Routes are also called Pennsylvania Traffic Routes, and formerly State Highway Routes.〔Pennsylvania Department of Transportation, (Historic Transportation Maps )〕
==History==
The Pennsylvania State Route System was established by the Sproul Road Bill passed in 1911. The system took control of over 4,000 miles of road. The system of roads continued to grow over the next few decades until continual addition of roads faced greater opposition. On October 1, 1940, the Pennsylvania Turnpike's first section of highway was opened to motorized traffic; the Turnpike operated under the Pennsylvania Turnpike Commission and was independent of the then-known Department of Highways.
In 1970, the Department of Highways and several other offices and departments were reorganized into the Pennsylvania Department of Transportation. In 1987, the Sproul system of Legislative Routes was reorganized into the current Pennsylvania State Route System under the Location Referencing System.

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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