Dozens of Charlestown residents lined up beneath the Leonard P. Zakim Bunker Hill Memorial Bridge on Friday as if waiting for a starting gun to go off. Some 698 feet away in Cambridge, an equally anxious contingent stood ready to charge in their direction. Between them lay the largest pedestrian and bicyclist bridge ever built in Boston, a $10 million, steel-piped architectural wonder. The bridge is the first of three pedestrian and bicyclist bridges expected along the Charles River.
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