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Route information; Maintained by PTC: Length: 360.09 mi [4] (579.51 km): Existed: October 1, 1940 [1] [2] –present: History: Section to Upper Merion Township completed on November 20, 1950, section to the Ohio State line completed December 1, 1954, section to the New Jersey state line completed on May 23, 1956; [3] Current road at Laurel Hill opened on October 30, 1964; current road at the ...