Yerba Buena Tunnel, Road tunnel on Yerba Buena Island, San Francisco, United States
Yerba Buena Tunnel is a two-level passage through Yerba Buena Island that carries Interstate 80 with ten lanes of traffic. It connects the eastern and western sections of the Bay Bridge, allowing vehicles to cross between San Francisco and the East Bay communities.
Construction started in 1933 when President Franklin D. Roosevelt remotely detonated dynamite to begin the Bay Bridge project. The tunnel opened in 1936 and became a critical link in regional transportation infrastructure.
The tunnel represents a major milestone in California transportation development, transforming the connection between San Francisco and Oakland communities across the bay.
Thousands of vehicles travel through daily, making it a major commuter route between San Francisco and the East Bay. Peak traffic times can affect travel speed, and the tunnel is only one section of the overall Bay Bridge crossing.
When it opened, this passage was the world's largest-bore tunnel at roughly 23 meters (76 feet) wide and 18 meters (58 feet) tall. Most drivers passing through never realize they are traveling under solid rock through the heart of the island.
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