The California Department of Transportation will conduct an emergency response drill in the Caldecott Tunnel between 10 p.m. on Dec. 12 and 4 a.m. on Dec. 13, weather permitting. During the drill, the Fourth Bore will close down.
The Moraga-Orinda Fire District voluntarily participates in the drill, which will include fire simulation, a crash simulation and simulated smoke. Caltrans advises motorists to expect delays and to plan for extra travel time. -N. Marnell