Or build more freeways around it.
That’s a non starter. The area is too populated. Eminent domain would take decades of court battles.
The Baltimore area was the most daunting challenge when building I-95, the busiest interstate in America.
There are already two tunnels but a bridge in necessary for trucks and hazmat.
The go-around is the Beltway, which was part of the bridge. It’s 40 plus miles around and almost always packed. To add a lane would again take decades.
Smart travelers will take I-81 which is two hours west of Baltimore or travel through Delaware when possible.
Last Wednesday, WAZE took me through Downtown on the surface as the best route. It still took a couple hours.
My recommendation is to make one tunnel commercial vehicles only. The other for passenger. They are on separate highways that are basically parallel.
As far as the bridge, a privately owned toll bridge would be built faster and cheaper.
For the contractor, a $100,000 per day early completion bonus would likely shave months off construction.
MY solution.