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Published on Mar 27, 2018
When it’s finished, Seattle's new SR 99 tunnel will be one of the safest in the world. More than 300 cameras inside will monitor traffic and security. Automatic ventilation systems will keep air quality and visibility high. Fire suppression systems can automatically spot and activate in a targeted location of a fire. An AM/FM override communication system, loudspeakers inside the tunnel and more than 100 programmable traffic signs allow tunnel operators to communicate with travelers. This video explains how two of the many safety systems talk and listen to each other to create One Smart Tunnel.