The fourth bore of the Caldecott Tunnel has what is called a Fire-Life-Safety System as illustrated below.
Fire-Life-Safety System includes:
- Emergency lights
- Carbon monoxide and nitrogen oxide sensors monitor air quality.
- 19 jet fans mounted at the top can redirect air flow in either direction.
- 17 emergency stations equipped with a fire extinguisher, manual fire alarms and emergency phones.
- Video image detectors to notify operators of an incident in the tunnel.
Both the Oakland and Moraga-Orinda Fire Departments respond to tunnel fires. Crosspassages between bores 3 and 4 will allow for evacuation.
Crosspassages are equipped with:
- Closed-circuit televisions and intercoms
- A ventilation system designed to prevent smoke and flames from entering
In addition, message signs at the portal and within the tunnel will display messages, and a tunnel radio system is in place to override other radio stations to give emergency messages to motorists.
For more information on Caldecott Tunnel Fourth Bore emergency procedures, it’s detailed in the Caldecott Tunnel Spring-Summer 2013 Project Update (PDF)