In order to highlight the need for a new transportation bill, President Obama is visiting the Tappan Zee Bridge today (which, ironically, is likely to increase delays to commuter). Tappan Zee is one of about 10,000 bridges that–like the Skagit River bridge that collapsed almost a year ago–is considered “fracture critical,” meaning the destruction of one key part could lead the entire bridge to fall down. However, the state of New York is currently building a replacement bridge that will not have this fault.
The destruction of just one part of this bridge could cause the entire center span to collapse. On the other hand, the bridge has lasted 59 years, and probably could last quite a few more without anything destroying one of the fracture-critical parts. The bridge may be in poor condition for a number of reasons, but being fracture-critical is not one of them. Flickr photo by waywuwei.
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