The New York Times Agency Photos
SCI BRIDGE QUAKEPROOFING 3
FILE -- Twin ribbons of a new skyway lead to the suspension San Francisco-Oakland Bay Bridge in San Francisco, Dec. 13, 2011. The new eastern span of the Bay Bridge in San Francisco is designed to go with the flow if a major earthquake strikes, to ensure minimal damage and disruption, and meant to last at least 150 years after its expected opening in 2013. (Mika O. Grondahl/The New York Times)