The Fort McHenry Tunnel (95) has the same restrictions as the Baltimore Tunnel (895):
"Vehicles carrying bottled propane gas in excess of 10 pounds per container (maximum of 10 containers), bulk gasoline, explosives, significant amounts of radioactive materials, and other hazardous materials are prohibited from using both the Fort McHenry and Baltimore Harbor Tunnels. For additional information regarding these restrictions, please call 410-537-1374."
The easiest way around is 695E to the Key Bridge. It is a toll bridge.