Vista Ridge Tunnels

The Vista Ridge Tunnels are highway tunnels through the Tualatin Mountains ("West Hills") of Portland, Oregon, United States. With their eastern ends located in the Goose Hollow neighborhood, the tunnels pass through a hillside locally known as Vista Ridge, a half mile (1 km) west of downtown Portland. Sunset Highway, also known as U.S. Route 26, is carried through the tunnels, three lanes in each direction. They are Oregon's busiest tunnels.

Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).