OAKLAND, CA – MAY 23: Workers walk on a cable of the newly constructed eastern span of the San Francisco-Oakland Bay Bridge on May 23, 2013 in Oakland, California. Bridge workers began installing large steel saddles over two seismic safety devices on the new East Span of the San Francisco-Oakland Bay Bridge to fix a problem with broken bolts on two shear keys. The bridge has been under construction since 2002 with an estimated price tag of $6.3 billion and will have the world’s tallest Self-Anchored Suspension (SAS) tower once completed. (Photo by Justin Sullivan/Getty Images)