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Presenter: Patty Fordyce

The SR 99 (Alaskan Way) Tunnel is currently under construction. This design-build project is located in Seattle, Washington, and consists of a single bore tunnel that is 9,200 feet long. The roadways are stacked with an egress corridor and utility spaces to one side and a smoke extraction duct on the other side. Fire and life safety systems are critical to the safe passage of the driving public through the tunnel. These systems include tunnel ventilation, emergency communications, emergency egress, fire suppression, traffic control, power, and lighting. This session will discuss the various systems, criteria that were considered, problems that were identified, and how the problems were resolved.