The Washington State Department of Transportation (WSDOT) has replaced its SR 99 Alaskan Way Viaduct – which was pone to damage from earthquakes – with a new underground SR 99 tunnel. Underground construction of the tunnel allowed traffic above the ground to continue using the old viaduct with minimal disruption. This video shows the how two of the tunnel’s many systems will communicate to make it one of the safest and smartest tunnels in the world. Construction of the tunnel is complete, but it will not be open to traffic until the fall of 2018 at the earliest.
WSDOT replaces earthquake-prone viaduct with a smart and safe underground tunnel
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