How Accelerated Bridge Replacement Works

In Pittsburgh, Pennsylvania, crews are replacing the 75-year-old Commercial Street Bridge, a critical crossing that carries roughly 100,000 vehicles every day. Rather than spending years rebuilding the bridge around live traffic, the project team came up with a much more ambitious plan: build an entirely new bridge alongside the existing one, demolish the old structure, and slide the massive replacement into position during a single 25-day highway closure.