The Golden Gate Bridge and Highway District stipulated that the bridge would not be closed during the project. All work was done between 8 p.m. and 5:30 a.m., and only four of the bridge’s six lanes were being shut off. Crews, and put them back every morning.
Each night crews brought out their equipment and tools and sawed out a 50-foot by 30-foot section of concrete roadway and sidewalk They replaced the concrete with two preformed road sections laid on the exposed floor beams of the bridge structure and replaced and narrowed sidewalks, to widen the road by 24 inches. The replacement ”orthotropic” surface is 40 percent lighter than the old concrete, and the steel supports of the new structure form the roadway itself. Each of the more than 750 20-ton highway panels and 325 sidewalk panels was individually designed for its particular location.