|2016 Marin County Tunnels
Marin County is big on bicycles and so there are several bicycle routes for commuters. I rode on the Cal Park Hill Pathway which shares a 1000 ft long tunnel with the Sonoma-Marin Area Rail Transit (SMART) Line. It includes a gate that closes the bike path at midnight (shown above). There are several similar 19th century railroad tunnels that are being renovated for new passenger rail lines and bike paths.
Marin County, California Bridges: Marin County Tunnels by Mark Yashinsky is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.