Is this really true?
I am looking at the m tag page and I see

(Plan 1) Baltimore Region Commuter Plan: (Fort McHenry Tunnel, Baltimore Harbor Tunnel, Francis Scott Key Bridge, John F. Kennedy Memorial Highway and Thomas J. Hatem Memorial Bridge) Pay $20 for 50 trips that are valid for 60 days. Because tolls are collected only in one direction at the JFK Highway and Hatem Memorial Bridge, two trips are deducted for each passage.

That would mean that it is .40 a journey through the tunnel. So if I make 5 trips in 60 days I break even. I am not quite sure how I missed this when I enrolled.