Over Labor Day weekend, the Oakland-San Francisco Bay Bridge was closed in both directions while crews replaced a football field sized chunk of it.
The 6,500-ton section took months to build and days to install, but you can watch the install happen in just seconds thanks to the wonders of time-lapse.
My favorite part? Watching how often large groups of workers are just standing around and talking.
Or is that called supervising?
[San Francisco-Oakland Bay Bridge Update Video]
[Via: Boing Boing]
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