Squirrel Hill Tunnel
The Squirrel Hill Tunnel is a tunnel in Pittsburgh, Pennsylvania, United States. It serves as an eastern gateway to the city for I-376 and was completed in 1953 after 8 years of construction and at a cost of US$18 million. At the time of opening it was the single largest investment by the Pennsylvania Department of Transportation. It is 4,225 feet (1, 288 m) long and is a twin-bore tunnel with 8 cross passages.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).