Question: Which state is Sisters State Park located in, which is bisected by U.S. Route 20, the longest road in the United States, spanning 3365 miles?
Sentence (from "U.S. Route 20 in Pennsylvania"): U.S. Route 20 is an east-west U.S. Highway in Pennsylvania, which clips the northwestern corner of the state, running entirely in Erie County.
Relevant evidence: No