The San Francisco-Oakland Bay Bridge is under construction, and scheduled to open Labor Day 2013. The Self-Anchored Suspension Span (SAS) is the largest bridge of its kind in the world measuring 2,047 feet. This engineering and construction marvel raises the bridge building bar to new heights, as seen in these behind the scenes photos taken on Monday, March 18, 2013. This image shows where two steel segments of the new span are joined. (AP Photo/Alex Menendez)
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