So you are going to slow down the ships in and out of Baltimore to 1-2 knots until past the bridge? And only one at a time. That should reduce the usefulness of the harbor for freight handling by a large factor.
Perhaps a better solution is to locate the bridge supports to where the large ship runs aground before it can hit them. This would mean a longer center span perhaps a little more susceptible to damage from a too-tall ship, likely more costly. But I think the too-tall ship is more easily managed then slowing ships in and out of Baltimore to a crawl. Or build structures around the bridge supports that can prevent a ship taking them out.
Fred W
Perhaps a better solution is to locate the bridge supports to where the large ship runs aground before it can hit them. This would mean a longer center span perhaps a little more susceptible to damage from a too-tall ship, likely more costly. But I think the too-tall ship is more easily managed then slowing ships in and out of Baltimore to a crawl. Or build structures around the bridge supports that can prevent a ship taking them out.
Fred W