Question: What year was the Cumberland Gap Tunnel, one of two mountain vehicular tunnels in the United States, opened which extended U.S. 58 from Harrogate, Tennessee to Virginia Beach, Virginia?
Sentence (from "U.S. Route 58"): It was then extended southwest along a short piece of former US 25E, which no longer enters Virginia, to end at the new alignment in Tennessee.
Relevant evidence: No