Alternative Fuel Vehicle (AFV) Access to Tunnels

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Email the Technical Response Service or call 800-254-6735.

An AFV powered by propane or natural gas may only use the Baltimore Harbor Tunnel and the Fort McHenry Tunnel if the vehicle has a dedicated alternate fuel system installed by the manufacturer of the vehicle or a fuel system that has been properly converted to an alternate fuel system, conforms to applicable federal regulations and industry standards, has a fuel capacity that does not exceed 150 pounds, and displays all proper markings and symbols.

(Reference Code of Maryland Regulations