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State Route 1 - Tom Lantos Tunnel (Devil’s Slide) Overnight Closures Published: Dec 18, 2023 Southbound Tunnel, December 19-21; 8:00pm – 4:00am Each Night SAN MATEO COUNTY — Caltrans has scheduled overnight closures of southbound State Route (SR-1) at the Tom Lantos Tunnel (Devil’s Slide). The closures are to facilitate drain cleaning.   Traffic Control Measures: One-way […]