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SR 99 automated closure gates system sign

This sign is part of the Alaskan Way Viaduct's new automated closure gates system at the Bell Street on-ramp in Seattle. The system closes all nine access points to the viaduct when sensors detect an earthquake. WSDOT tested the system during the viaduct's semiannual inspection and maintenance closures on March 19-20, 2011.


Learn more about the automated viaduct closure system and the SR 99 Alaskan Way Viaduct Replacement Program.

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Taken on March 19, 2011