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CALDECOTT TUNNEL TIMELINE – BEFORE TO THE FOURTH BORE
As we all eagerly await the opening of the new Fourth Bore of the Caldecott Tunnel it’s of interest to look back and see what folks had to deal with before there was a Caldecott . And, then see the major changes between then and now…
BOR-ING FACTS: Hwy 24 currently carries about 160,000 vehicles daily through the three existing tunnels. Traffic congestion is experienced in the peak and off-peak directions. The new fourth bore will relieve congestion in the noncommute direction by permanently dedicating two bores to westbound traffic and two to eastbound traffic.
– The new tunnel has sophisticated fire-life-safety systems .
– The VID cameras will monitor traffic patterns and alert an operator if there is a slowdown or accident. There are linear heat, carbon monoxide and nitrous oxide detectors to monitor fire and air quality.
– There are 17 emergency stations equipped with fire extinguishers, manual fire alarms and emergency phones. In the event of a fire, 19 bidirectional jet fans will be activated along with the ventilation system and can redirect air flow.
-The tunnel lining has been built with special fibers that shield the tunnel from heat to prevent a strong fire from damaging the tunnel structurally.
-Variable message signs at the portal and within the tunnel will display preprogrammed messages triggered automatically
See full TIMELINE from Before to the Fourth Bore – in pictures
75 Years Later – A Fourth Bore
FALL 2013 – FINISHING THE CALDECOTT NEW FOURTH BORE.
Construction Activities Update: November 2013
Photo by Karl Nielsen, MTC
Testing of the Fourth Bore’s state-of-the-art tunnel systems is proceeding to ensure that incidents inside the tunnel, such as a car accident or fire, are detected and suppressed rapidly. Fire drills, including emergency responder preparedness exercises, are in progress the week of November 11th. For the bore to open, these drills must be completed successfully. Learn more about the tunnel’s life safety systems in the recent Fact Sheet(PDF).
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CALDECOTT TUNNEL TIMELINE – BEFORE TO THE FOURTH BORE