By Leanna Garfield, Business Insider US; November 17, 2017
Seattle, Washington is no stranger to ambitious transportation projects. The city is already home to four of the world’s longest floating bridges. (Unlike a traditional bridge, a floating one often uses massive pontoons – watertight concrete blocks filled with air – to support its road deck.) Earlier this year, Seattle also completed an earthquake-resistant bridge.
Now the city is embarking on an even more ambitious transport project. Local transit agency Sound Transit is build the world’s first light rail (a passenger train designed for light traffic) – on a floating bridge over Lake Washington by 2023.
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