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 former employer was building a business park for high tech and with a planned community. When it was about 80% done (having met all the permits), the State of Washington threw a stop work curve-ball saying the traffic this development would generate requires a much larger on/off ramp than what was there. The State said only THEY could build these due to the strict specifications. It would take 2 or 3 years with my employer paying the bloated costs blah blah blah..
My employer sued and won with the judgment that the company would build the ramp to state specs.
5 months later, the interchange was open, way under the State's estimated cost and on time. The embarrassment caused the State to not allow that again (20 years ago)
Nice analysis.
301 is worth considering as a way to avoid Baltimore.