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Highways and roads

PennDOT owns 39,861 miles (64,150 km) of the 121,770 miles (195,970 km) of roadway in the state, making it the fifth-largest state highway system in the United States. The Pennsylvania Turnpike system is 535 miles (861 km) long, with the mainline portion stretching from Ohio to Philadelphia and New Jersey. It is overseen by the Pennsylvania Turnpike Commission. Another major east–west route is Interstate 80, which runs primarily in the northern tier of the state from Ohio to New Jersey at the Delaware Water Gap. Interstate 90 travels the relatively short distance between Ohio and New York through Erie County, in the extreme northwestern part of the state.

Primary north–south highways are Interstate 79 from its terminus in Erie through Pittsburgh to West Virginia, Interstate 81 from New York state through Scranton, Lackawanna County and Harrisburg to Maryland and Interstate 476, which begins 7 miles (11 km) north of the Delaware border, in Chester, Delaware County and travels 132 miles (212 km) to Clarks Summit, where it joins I-81. All but 20 miles (32 km) of I-476 is the Northeast Extension of the Pennsylvania Turnpike. The highway south of the Pennsylvania Turnpike is officially called the "Veterans Memorial Highway", but is commonly referred to colloquially as the "Blue Route".