During construction of Seattle’s double-decked State Route 99 tunnel, workers built, then buried ramps on the tunnel’s south end. Crews then built a temporary road on top of the ramps to keep traffic moving during tunnel construction. In 2019, crews will unbury the ramps as they work to realign SR 99 into the new, two-mile long tunnel. This time lapse condenses two years of work and shows what it looked like to build and bury the ramps in 2014.

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