Crews that built the railing committed what experts called a basic mistake - they welded the bolts in place firmly in their slots rather than leaving a small amount of room to accommodate a natural expansion of the bicycle path that happens in hot weather.
As a result, scores of the 1-inch-diameter bolts have been sheared off along the 1.2-mile bike path on the southern side of the span's skyway section.
— sfgate.com
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"The problem pales in comparison with the failure of 32 steel rods crucial to seismic-stability structures on the eastern span and questions that have been raised about the soundness of more than 2,300 similar metal fasteners. But it also adds to skepticism about how Caltrans managed construction of the bridge ..."
Bolts along Bay Bridge bike path fail
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