Six Lanes are Better than Four!
The Battery Street Tunnel is only four lanes and cannot be easily expanded without tearing down hundreds of millions in expensive real estate. - So, no matter what they do on the waterfront, this choke point still exists. A new tunnel under the city avoids this restriction by bypassing the antiquated Battery Street Tunnel. The Seattle TUBE can be built with a smoother grade and less dramatic curves for optimum traffic flow through the city.