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The article says Interstate 80 is the longest east-west interstate in Pennsylvania. There are two contexts one could take that to mean, neither of which can possibly be true. I-80 is 311 miles long in Pennsylvania, but I-76 (also east-west) is listed right above at 350 miles. In the other context, I-90 passes through Pennsylvania and is the nation's longest interstate highway. (See the I-90 page)
Interstate 80 could be considered the longest toll-free interstate in Pennsylvania, but that is not specified, and is really only true if one ignores the inbound toll at Delaware Water Gap.