Keeping up with a motion theme, here's time-lapse video of the Manhattan Bridge in New York City, showing the how the bridge bounces as traffic flows over it.
From the NY Department of Transportation:
"The bridge has moved this way for the last 100 years - exactly the way it was designed to - and it can move up to 16 inches daily with normal traffic conditions. The long-span suspension bridge flexibility by design allows the bridge to manage the weight of the traffic and subway cars it carries and the temperature shifts that occur throughout the year."
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