After three years of construction, the Caldecott Tunnel Fourth Bore opened to traffic on November 16, 2013. The project is intended to reduce congestion and travel times for motorists traveling in the off-peak direction. On average, motorists in the off-peak direction are saving 15-20 minutes and traffic flows freely under normal conditions.
The new Fourth Bore features wide travel lanes, roadway shoulders, bright lighting, emergency exits along the length of the tunnel, and state-of-the-art fire and life safety systems. The tunnel’s incident detection and response systems underwent extensive testing before the tunnel opened to traffic. These systems allow trained professionals to monitor and respond to threats inside the tunnel, including detecting and suppressing fires and other hazards, and providing real-time information to help motorists safely exit in an emergency. Learn more about these tunnel systems by downloading our recent Fact Sheet.
Dr. Bhaskar Thapa, a lead tunnel designer of the Fourth Bore, passed away in June 2013. Dr. Thapa played a critical role on the Caldecott Fourth Bore Project during his eight-year involvement — from design through excavation. Dr. Thapa’s wife, Sumira, and two sons, Barune and Sidhant, attended the Fourth Bore’s ribbon cutting ceremony on November 15, 2013, when he was formally recognized for his significant contributions to the project. His family received a standing ovation from the 250 guests who were present.
The Caldecott Tunnel Fourth Bore is now open to traffic. At approximately 4:25 am on Saturday, November 16, 2013 the Caldecott Fourth Bore opened to traffic – on time, under budget, with little fanfare.
The long-awaited tunnel opening occurred less than 24 hours after Caltrans and first responder agencies, including the City of Oakland Fire Department, the Moraga-Orinda Fire District, the California Highway Patrol and the State Fire Marshal signed an Emergency Response Plan (ERP) authorizing the state to open the new tunnel to traffic.