49 C.F.R. § 372.115
49 U.S.C. 13506(a)(6) provides an exemption from regulation for motor vehicles used in carrying ordinary livestock, fish, and unmanufactured agricultural commodities. Certain specific commodities have been statutorily determined to be non-exempt. Administrative Ruling No. 133, which is reproduced below, is a list of those commodities that are non-exempt by statute.
Administrative Ruling No. 133
List of Commodities That Are Not Exempt by Statute Under 49 U.S.C. 13506(a)(6)
Animal fats
Butter
Canned fruits and vegetables
Carnauba wax as imported in slabs or chunks
Cattle, slaughtered
Charcoal
Cheese
Coal
Cocoa beans
Coffee, beans, roasted, or instant
Copra meal
Cotton yarn
Cottonseed cake or meal
Diatomaceous earth
Dinners, frozen
Feeds:
Alfalfa meal
Alfalfa pellets
Beet pulp
Bran shorts
Copra meal
Corn gluten
Distilled corn grain residues, with or without solubles added
Fish meal
Hominy feed
Middlings
Pelletized ground refuse screenings
Wheat bran
Wheat shorts
Fertilizer, commercial
Fish:
Canned or salted as a treatment for preserving
Cooked or partially cooked fish or shrimp, frozen or unfrozen
Hermetically sealed in containers as a treatment for preserving
Oil from fishes
Preserved, or treated for preserving, such as smoked, salted, pickled, spiced, corned or kippered
Flagstone
Flaxseed meal
Flour
Forest products:
Resin products, such as turpentine
Fruits and Berries:
Bananas, fresh, dried, dehydrated, or frozen
Canned
Frozen
Hulls of oranges after juice extractions
Juice, fruit, plain or concentrated
Pies, frozen
Preserved, such as jam
Purees, strawberry and other, frozen
Grains:
Oils extracted from grain
Popcorn, popped
Rice, precooked
Wheat germ
Gravel
Hair, hog or other animal, product of slaughter of animal
Hay, sweetened with 3 percent molasses by weight
Hemp fiber
Hides, green and salted
Insecticides
Limestone, agricultural
Livestock:
Monkeys
Race horses
Show horses
Zoo animals
Lumber, rough sawed or planed
Maple syrup
Meal:
Alfalfa
Copra
Cottonseed
Fish
Flaxseed
Linseed
Peanut
Soybean
Meat and meat products, fresh, frozen or canned
Milk and Cream:
Chocolate
Condensed
Sterilized in hermetically sealed cans
Molasses
Nuts (including peanuts):
Peanut meal
Roasted or boiled
Oil, mint
Oil, extracted from vegetables, grain, seed, fish or other commodity
Pelts
Pies, frozen
Pigeons, racing
Pulp, beet
Pulp, sugar cane
Rock (except natural crushed, vesicular rock to be used for decorative purposes)
Rubber, crude, in bales
Rubber, latex, natural, liquid, from which water has been extracted and to which ammonia has been added
Sand
Seeds:
Oil extracted from seeds
Skins, animal
Soil, potting
Soil, top
Soup, frozen
Sugar
Sugar cane pulp
Sugar raw
Syrup, cane
Syrup, maple
Tea
Tobacco:
Cigars and cigarettes
Homogenized
Smoking
Top Soil
Trees:
Sawed into lumber
Vegetables:
Candied sweet potatoes, frozen
Canned
Cooked
French fried potatoes
Oil, extracted from vegetables
Soup, frozen
Soybean meal
Wool imported from a foreign country
Wool tops and noils
Wool waste (carded, spun, woven, or knitted)
Wool yarn
49 C.F.R. §372.115
Under 49 U.S.C. 13506(a)(6)(D) , any listed fish or shellfish product that is not intended for human consumption is exempt.
Under 49 U.S.C. 13506(a)(6)(E) , any listed livestock feed, poultry feed, agricultural seeds, or plants that are transported to a site of agricultural production or to a business enterprise engaged in the sale to agricultural producers of goods used in agricultural production is exempt