Location: Squirrel Hill Tunnel in (you guessed it) Squirrel Hill. Featured guests: Paul Manyisha, tunnel manager for PennDOT. 1. Paul talked me through some of the landmark’s stats. The Squirrel Hill Tunnel sees more traffic than any of Pittsburgh’s other tunnels. More than 100,000 vehicles a day drive through this tunnel that opened in 1953. It’s not the oldest or newest Pittsburgh tunnel – those distinctions go to the Liberty Tunnel (opened 1924) and Fort Pitt Tunnel (opened 1960).