New York Codes, Rules and Regulations
Title 21 - Miscellaneous
Chapter XXIV - The Port Authority Of New York And New Jersey
Subchapter A - Vehicular Crossings
Article 2 - Transportation of Hazardous Material
Part 1211 - Regulations Applying To Lincoln Tunnel, Holland Tunnel, George Washington Bridge Lower Level And George Washington Bridge Expressway
Compressed Gases-Tunnel, G.W.B. Lower Level and G.W.B. Expressway Restrictions
Section 1211.22 - Pressurized vessels

(a) Pressurized vessels (aerosol or similar type containers) containing a flammable liquid mixture (flash point at or below 80 degrees Fahrenheit), a combustible liquid mixture (flash point above 80 degrees Fahrenheit and at or below 150 degrees Fahrenheit) or a liquefied flammable compressed propellant gas are prohibited from entering either a tunnel, the George Washington Bridge Lower Level or the George Washington Bridge Expressway unless such vessel or container be of metal, of 19.3 fluid ounces capacity or less, and has an absolute pressure of 75 pounds or less, and when so packed in an outside container, the quantity of the total load shall not exceed 4,000 pounds gross weight per vehicle.

(b) Vessels containing non-dangerous materials that are propelled by non-flammable compressed gases are not restricted, regardless of quantity or size of containers.