WSDOT replaces earthquake-prone viaduct with a smart and safe underground tunnel


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.

Share this story:

About Author


Rachelle joined Traffic Technology International in early 2016 after having worked for an HR magazine and prior to that, as a freelance sub editor for various lifestyle consumer magazines. As deputy editor, she supports the editor in making each issue and updating the website. Outside of work, she enjoys tap dancing, playing the piano and video games, and eating spicy food.