(a) To determine which restrictions, if any, apply to the transportation of a hazardous material known by name—e.g., acetone:

1. (1) Locate name of hazardous material (as noted on shipping papers) in the alphabetical listing of hazardous materials which follow (section 1025.27[g] of this Part).
2. (2) In column 3, note hazard class. (Acetone is classified as a flammable liquid.)
3. (3) In column 4, note the UN and NA numbers, used in emergency response actions, and refer to the publication HAZARDOUS MATERIALS—1980 EMERGENCY RESPONSE HANDBOOK. (For example, acetone has UN number 1090.)
4. (4) In column 5, find section and subdivision numbers which refer directly to applicable restrictions. For acetone, references are 1025.14(g), (j), that is, section 1025.14, subdivisions (g) and (j)
5. (5) Turn to section number references in column 5. (In our example, it is section 1025.14, flammable liquids.) Then, going down the left-hand margin of the referenced section, locate the subdivision number or numbers also indicated in column 5. In our example, subdivision (g) limits the capacity and type of container that may be transported via the Queens Midtown Tunnel, the Brooklyn-Battery Tunnel or the Verrazano-Narrows Bridge Lower Level, while making due provision for the passage of empty containers, and prohibiting the passage of loaded or empty tank vehicles. Subdivision (j) has slightly different restrictions, based upon the use of inside containers.

(b) To determine which restrictions, if any, apply to the transportation of a hazardous material whose specific name is not known, but whose general class is indicated in the shipping papers:

1. (1) Locate, in the alphabetical index column 2, the name of the general class of material with which the unnamed article is normally identified, e.g., "Flammable liquids, n.o.s.," "Corrosive liquid, n.o.s.," etc.
2. (2) Proceed as in paragraphs (a)(3)-(5) of this section.