Caltrans will be questioned Tuesday by the California Senate Transportation and Housing Committee about whether it "sacrificed structural soundness for aesthetics" on the $6.4 billion San Francisco-Oakland Bay Bridge. Broken bolts, or threaded rods, are among the steel components that were chosen by the designers to build an "all-white, 525-foot pentagonal tower hung with a looping catenary cable that accentuates slim, 2.1-mile side-by-side horizontal decks." However, the bridge's design is not to be blamed for the defective bolts, said Marwan Nader, lead engineer for T.Y. Lin International. "The issue is that the (rods) did not perform as they were expected."