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US 322 goes 370 miles in Pennsylvania from the OH border at Jamestown to the NJ border at Chester (via the Commodore Barry Bridge.)

The longest state road in PA is PA 18, which runs from the WV line near Garrison to PA 5 at Lake City near Lake Erie. The road is 205 miles long.

Sources: Wikipedia, PAHighways.com

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Q: What is the longest road in Pennsylvania?
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