Table B-13. Estimated Measures of Reliability for Shipment Characteristics by Four-Digit Commodity: 2002

Table B-13. Estimated Measures of Reliability for Shipment Characteristics by Four-Digit Commodity: 2002

[Estimates are based on data from the 2002 Commodity Flow Survey]

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Code SCTG Commodity description (4-Digit) Value Tons Ton-miles Average miles per shipment coefficient of variation
Coefficient of variation of number Standard error of percent Coefficient of variation of number Standard error of percent Coefficient of variation of number Standard error of percent
  All commodities 1.3 2.0 3.7 2.9
100 Live animals and live fish 21.1 24.5 26.0 18.3
210 Wheat 11.4 10.9 0.1 12.2 0.2 17.3
220 Corn, except sweet 9.7 10.0 0.3 23.4 1.2 17.5
290 Other cereal grains 17.4 17.6 0.1 24.6 0.2 15.6
310 Fresh or chilled potatoes (Irish potatoes), except sweet 19.5 21.9 34.7 32.7
321 Fresh or chilled vegetables, except potatoes (Irish potatoes) 14.8 16.4 23.7 0.1 39.3
322 Dried vegetables 26.2 33.3 35.5 14.2
331 Fresh or chilled citrus fruit 44.5 36.8 S S 18.0
332 Fresh or chilled edible fruit, except citrus 38.5 48.2 30.9 17.8
333 Dried fruit S S S S S S 22.6
334 Fresh or dried nuts 35.5 36.8 44.7 14.1
340 Soya beans 8.9 8.6 0.1 14.6 0.3 18.9
350 Oil seeds and nuts, except olives and soya beans 35.5 31.1 46.1 21.9
360 Bulbs, live plants, and seeds for sowing nec 17.5 29.3 39.3 13.2
391 Fresh-cut flowers 31.4 27.1 S S S
392 Unmanufactured tobacco 30.8 31.3 S S 16.3
393 Raw cotton not carded or combed 26.5 29.0 24.8 34.3
399 Other 28.1 45.9 47.9 18.0
411 Cereal straw or husks and forage products S S S S 35.0 S
412 Inedible flours, meals, and pellets of meat, fish, or seafood, and greaves 23.6 19.8 30.5 24.1
413 Bran, sharps, and other residues of cereals or leguminous plants 22.5 33.0 40.0 24.4
414 Oil cake and other solid residues from the man 16.3 17.1 15.9 14.2
419 Other 18.8 37.4 26.6 S
421 Dog or cat food put up for retail sale 21.4 27.4 23.6 13.2
429 Other, including complete feeds, premixes, bird seed, fish food, and feed 17.1 21.4 0.2 15.7 0.1 24.3
511 Fresh, chilled, or frozen, except poultry 7.0 6.7 7.2 18.7
512 Fresh, chilled, or frozen poultry 7.9 8.7 12.2 17.3
513 Meat, salted, in brine, dried, or smoked, edible flours and meals, and pig 17.5 17.3 19.1 42.1
520 Fish, except live, and seafood, except preparations 13.2 10.8 18.8 32.8
531 Of meat, including poultry 26.6 42.2 S S 43.2
532 Of fish or seafood 39.6 S S 47.4 28.0
610 Wheat flour, groats, and meal 19.2 22.4 21.5 17.1
621 Malt S S S S S S 25.7
629 Other 16.8 15.9 19.6 14.3
631 Pasta, including stuffed, canned, frozen, or dried, and couscous 22.4 31.0 34.8 18.0
632 Breakfast cereal foods, rice cakes, and similar prepared foods 29.1 21.4 22.0 8.2
639 Other 13.3 21.6 10.9 10.1
641 Baked snack foods 23.6 21.0 24.6 S
642 Frozen baked products 15.1 16.6 22.7 11.2
643 Perishable or dry baked products 12.8 23.2 14.8 27.8
711 Milk and cream 18.3 19.2 18.2 11.8
712 Cheese and curds 13.4 12.3 13.0 15.1
713 Ice cream or ice milk and their novelties, water ices, and sherbets 26.3 23.8 28.1 38.0
719 Other 18.2 36.3 17.7 46.1
721 Frozen vegetables and vegetable preparations 29.4 26.5 27.5 15.5
722 Processed or prepared vegetables, except frozen, dried, or milled 15.0 17.3 21.7 0.1 25.0
723 Processed or prepared fruit and nuts, except dried 18.8 18.4 24.2 20.6
724 Juices, except those fortified with vitamins or minerals, but including 12.9 14.4 21.4 S
730 Coffee, tea, and spices, except unprocessed coffee and unfermented tea 21.5 26.0 33.7 17.9
741 Animal fats and oils and their fractions, not chemically modified 45.8 S S 36.2 19.3
742 Fixed vegetable fats and oils and their fractions, not chemically modified 15.5 12.3 17.7 8.7
743 Chemically modified fats and oils, prepared edible fats, and animal or 27.6 27.6 26.8 27.5
744 Flours and meals of oil seeds, except of mustard 19.3 20.8 12.2 14.7
750 Cane, beet, and other sugars in solid form, sugar syrups not containing 11.6 17.4 23.0 0.2 10.5
761 Confectionery 9.2 11.0 10.4 14.2
762 Cocoa beans, paste, butter, and powder, and cocoa preparations 39.6 48.5 38.0 17.9
771 Sauces, mixed condiments and seasonings, prepared mustard, and mustard 14.2 16.5 19.0 10.3
772 Soups and broths and their preparations and baby or dietetic food 23.8 28.2 40.8 16.0
773 Syrups and concentrates, and flavoring powders, extracts, or essences 18.8 15.1 16.8 15.0
779 Other 20.2 26.2 24.1 11.8
781 Sweetened or flavored water 9.4 10.1 0.1 14.4 32.2
789 Other 15.9 20.6 34.2 46.3
810 Malt beer 5.7 5.9 18.6 10.3
820 Wine and other fermented beverages 8.8 12.5 17.0 15.2
831 Undenatured ethyl alcohol of a strength by volume of 80 percent volume or 17.9 18.1 24.2 S
832 Undenatured ethyl alcohol of an alcoholic strength by volume of less than 9.0 8.6 15.3 6.9
901 Cigarettes 17.3 0.1 34.1 47.8 13.3
909 Other 13.6 25.8 20.5 14.3
1001 Calcareous monumental or building stone 41.4 S S 46.4 26.6
1002 Monumental or building stone, except calcareous and dolomite 33.4 28.9 19.5 18.2
1101 Silica sands and quartz sands, for construction use 9.9 9.5 0.3 17.7 0.1 9.3
1102 Silica sands and quartz sands, for uses other than construction, and other 8.2 11.2 0.1 9.9 25.3
1201 Limestone and chalk (calcium carbonate) 10.1 13.7 0.8 10.7 0.1 10.7
1202 Gravel and crushed stone, except dolomite, slate, and limestone 9.5 10.7 0.8 13.9 0.2 9.4
1310 Salt 35.6 28.1 32.9 0.1 14.5
1320 Natural calcium phosphates, natural aluminum-calcium phosphates, and 19.8 32.5 27.2 33.8
1330 Dolomite 24.9 27.1 0.2 45.5 0.3 39.5
1391 Sulphur, except sublimed, precipitated, and colloidal 39.7 41.4 S S 34.9
1392 Clays 21.6 17.2 13.0 13.2
1399 Other 13.3 20.9 29.9 0.1 23.4
1410 Iron ores and concentrates 15.4 14.9 0.1 20.2 0.4 13.2
1491 Copper 26.5 22.8 31.0 35.3
1499 Other 19.3 43.7 38.3 13.9
1510 Nonagglomerated bituminous coal 8.2 9.1 0.8 16.9 2.4 8.5
1591 Nonagglomerated anthracite S S S S S S 24.4
1592 Nonagglomerated lignite, except jet 17.3 17.7 0.1 41.1 39.1
1593 Agglomerated coal S S S S S S S
1710 Gasoline 4.8 0.2 5.5 0.5 10.7 0.4 10.3
1720 Aviation turbine fuel (types A and B) 16.1 17.2 0.1 22.3 18.0
1800 Fuel oils 6.0 6.0 0.3 10.1 0.2 13.5
1910 Lubricating oils and greases containing by weight 70 percent or more of 13.8 16.6 25.0 25.8
1920 Refined petroleum oils and oils obtained from 14.6 16.7 0.1 22.7 30.1
1931 Liquefied natural gas 35.0 S S 37.1 18.6
1932 Liquefied gaseous hydrocarbons, except liquefied natural gas 15.4 14.4 19.7 0.1 35.4
1933 Gaseous hydrocarbons in a gaseous state 45.2 S S 45.4 S
1991 Coal coke, petroleum coke, and retort carbon 22.5 24.0 0.1 44.7 0.3 S
1992 Petroleum asphalt 28.0 26.3 0.1 20.0 29.0
1993 Bituminous mixtures based on natural asphalt, natural bitumen, petroleum 21.9 27.4 0.3 19.9 46.4
1999 Other 18.3 21.5 26.6 13.2
2010 Sodium hydroxide (caustic soda) and potassium hydroxide (caustic potash) 10.8 13.7 15.2 18.8
2021 Sublimed, precipitated, or colloidal sulphur 36.5 12.0 17.0 16.6
2022 Inorganic acids, except nitric and phosphoric 23.3 16.9 29.5 16.9
2023 Aluminum oxide and aluminum hydroxide 38.3 S S S S 21.5
2024 Industrial gases 24.4 35.6 0.2 29.4 S
2025 Sodium or potassium compounds, nec 24.8 31.9 33.0 0.1 18.9
2026 Metal compounds, nec 16.3 16.0 20.8 13.6
2029 Other 16.5 18.5 31.4 0.1 13.2
2030 Cyclic hydrocarbons 24.7 28.7 18.8 19.4
2041 Acyclic alcohols 29.8 S S 23.9 20.0
2042 Phenols, phenol-alcohols, aldehydes, cyclic polymers of aldehydes, 14.9 14.8 24.6 18.5
2043 Organic acids 18.8 14.9 20.8 16.8
2050 Organic chemicals, nec 13.7 0.1 17.4 0.2 20.7 0.3 14.6
2100 Pharmaceutical products 9.5 0.5 16.7 21.0 5.7
2201 Animal or vegetable fertilizers and fertilizers produced by the mixing or 42.9 30.9 33.3 S
2202 Nitrogenous mineral or chemical fertilizers 20.7 18.4 0.1 15.9 0.1 S
2203 Phosphatic mineral or chemical fertilizers 36.5 S S 39.9 0.2 40.0
2204 Potassic mineral or chemical fertilizers 35.4 31.5 37.1 23.5
2209 Other 19.1 25.1 0.2 S S 21.9
2311 Paints and varnishes 18.0 18.6 32.3 0.1 16.6
2312 Vegetable tanning extracts and coloring matter, tannins and their 28.6 25.1 29.7 17.3
2320 Essential oils and resinoids, and perfumery, cosmetic, or toilet preparations 10.7 13.7 17.3 8.0
2330 Soap, organic surface-active agents, cleaning preparations, polishes and 11.0 12.7 13.8 9.2
2340 Photographic film, plates, paper, paperboard, or textiles, and chemical 17.5 17.7 22.5 26.5
2350 Insecticides, rodenticides, fungicides, herbic 15.9 23.9 24.3 13.1
2390 Other chemical products and preparations 13.3 14.0 15.5 0.1 7.9
2410 Plastics in primary forms, rubber in primary forms or sheets, and 9.6 7.6 8.5 0.1 10.1
2421 Manmade fibers and plastics basic shapes 6.3 8.4 10.4 10.6
2422 Articles 4.4 7.0 7.5 6.4
2431 Tires and related products 17.6 0.1 15.6 29.0 15.1
2439 Other 9.3 15.9 21.8 9.2
2501 Logs for pulping (pulpwood) S S S S S S 17.7
2502 Logs for lumber 28.2 S S 42.5 S
2509 Other 37.2 28.1 26.9 16.3
2610 Wood chips or particles 25.6 25.3 0.2 33.0 13.7
2621 Lumber 9.2 9.5 0.1 12.1 0.2 9.8
2622 Wood continuously shaped along any of its edges or faces and shingles and 7.5 11.0 15.4 16.4
2631 Veneer sheets and sheets for plywood 18.0 24.3 23.0 22.3
2632 Particle board, fiberboard, and similar board of wood or other ligneous 11.7 17.0 32.7 0.3 11.6
2633 Plywood, veneered panels, and similar laminated wood 7.4 6.6 15.2 20.0
2640 Builders joinery and carpentry of wood, except shingles and shakes 19.9 0.1 15.4 24.0 13.9
2690 Other wood products 10.2 18.6 42.6 16.3
2711 Mechanical wood pulp 28.4 27.6 21.8 17.4
2712 Nondissolving grades of soda or sulphate chemical wood pulp S S S S 40.5 26.8
2719 Other 21.8 30.5 S S 23.1
2720 Newsprint in large rolls or sheets 8.7 8.5 9.8 10.0
2731 Paper 6.8 8.0 7.5 17.3
2732 Paperboard 12.5 11.1 9.6 20.5
2741 Paper 10.7 7.9 8.0 12.2
2742 Paperboard 25.0 25.9 34.5 0.1 16.8
2801 Toilet paper, facial tissues, paper towels and napkins, sanitary napkins 9.5 12.6 14.1 14.7
2802 Packing containers of paper, paperboard, cellulose wadding, or webs of 7.0 8.2 13.1 7.7
2809 Other 8.4 10.8 12.2 10.5
2910 Printed books, brochures, leaflets, and similar printed products 15.7 0.1 12.1 13.5 4.7
2921 Newspapers 34.6 26.6 29.1 S
2922 Journals and periodicals 12.8 15.1 16.0 13.3
2930 Advertising material, commercial or trade catalogues, and similar printed 7.5 15.6 13.4 7.4
2991 Printed or illustrated postcards, messages, or announcements, and printed 14.3 21.2 44.5 7.5
2999 Other 9.6 20.6 16.2 6.5
3011 Textile fibers, processed but not spun or made into yarn 19.3 40.3 43.9 11.4
3012 Yarns and thread, except specialty yarns, such as metallized or gimped 16.7 22.7 16.3 8.8
3013 Broadwoven fabrics, except made of metallized yarn 15.6 19.2 22.9 8.1
3014 Knitted or crocheted fabrics 14.2 16.0 14.0 8.3
3020 Textile clothing and accessories, and headgear, except safety 9.0 0.3 11.3 30.3 0.1 3.4
3031 Narrow-woven fabrics and related products 27.0 20.9 24.9 6.6
3032 Carpets and other textile floor coverings 14.0 18.4 24.3 9.9
3033 Household furnishings 8.5 12.0 10.4 4.9
3039 Other 16.5 17.7 19.7 6.6
3040 Footwear 27.6 0.1 19.0 18.1 4.5
3050 Leather and articles, luggage of related materials, and dressed furskins 22.1 S S S S 5.8
3110 Hydraulic cements 11.2 11.9 0.1 18.8 7.6
3121 Refractory cements, mortars, concretes, and ceramic products 32.5 37.6 31.6 34.0
3122 Ceramic construction products 29.9 39.4 S S 18.4
3123 China, porcelain, and other ceramic household or personal articles 36.2 S S S S 6.9
3129 Other 39.2 S S S S 10.2
3131 Glass in sheets or profiles 13.5 14.2 12.2 19.7
3132 Containers of glass used for transporting or packing goods 16.2 17.3 26.7 14.1
3139 Other 18.2 S S 40.1 0.1 18.6
3191 Worked monumental or building stone and articles 44.6 S S S S 19.8
3192 Articles of asphalt or of similar material 32.0 29.4 40.5 0.1 14.8
3193 Plaster and articles of plaster or of compositions based on plaster 16.5 15.2 13.9 32.0
3194 Nonrefractory mortars and concretes 33.3 22.0 0.7 34.0 0.1 15.8
3195 Articles of cement, concrete, or artificial stone 12.3 13.7 0.3 19.3 0.1 21.9
3199 Other 10.9 17.7 0.1 23.3 0.2 16.8
3210 Iron and steel in primary forms, in semifinished forms, or in powders or 10.6 16.7 13.5 14.8
3220 Flat-rolled products of iron or steel 7.3 8.0 0.1 8.4 0.2 8.5
3230 Bars, rods, angles, shapes, sections, and wire, of iron or steel 10.0 9.5 14.1 0.1 8.0
3241 Copper 12.6 15.8 22.0 16.1
3242 Aluminum 7.1 7.3 8.3 10.7
3249 Other 19.4 S S 49.5 0.1 8.5
3311 Pipes and tubes 6.6 23.3 11.9 15.2
3312 Pipe and tube fittings 11.7 9.5 11.7 14.8
3320 Structures and parts, except prefabricated buildings 8.7 10.5 14.6 7.7
3331 Nails, screws, bolts, nuts, washers, staples, 10.5 15.8 19.0 13.4
3332 Hand tools and cutlery, except of precious metals 14.8 19.4 37.1 9.6
3333 Interchangeable tools for hand- or machine-tools 13.0 37.2 S S 12.5
3334 Locks, mountings and fittings, racks and similar fixtures, and automatic 17.3 20.4 26.8 9.5
3391 Containers of a capacity not exceeding 300 litres, except containers for 14.5 16.9 21.6 14.2
3399 Other 12.2 31.1 25.0 10.7
3411 Spark-ignition reciprocating internal-combusti 15.1 16.7 13.5 15.4
3412 Other internal-combustion engines 11.6 12.1 15.7 32.2
3413 Parts of internal-combustion piston engines 19.5 24.1 18.4 19.0
3421 Turbines 16.7 29.2 30.5 9.4
3422 Boilers, nuclear reactors,and nonelectric motors, 17.1 20.1 21.4 13.4
3431 Pumps for liquids 12.2 18.8 22.0 14.9
3432 Air or vacuum pumps and air or other gas compressors 27.9 28.4 38.2 16.2
3433 Fans and ventilating or recycling hoods incorporating a fan 16.6 26.8 37.8 12.6
3441 Air-conditioning equipment 12.3 18.6 20.9 19.7
3442 Refrigerating or freezing equipment 12.0 13.4 17.1 18.0
3451 Lifting, handling, loading, or unloading machinery and equipment 10.4 12.9 14.1 10.6
3452 Moving, grading, levelling, scraping, excavating, tamping, compacting, 7.8 14.4 13.9 17.2
3491 Dishwashing machines, machinery for cleaning or drying bottles or other 23.7 35.5 34.9 18.5
3492 Agricultural, horticultural, forestry, and poultry- or beekeeping machinery 12.2 15.1 16.2 35.0
3493 Textile manufacturing machines and household, commercial, or industrial 15.3 18.2 21.9 16.8
3494 Machine-tools, except for semiconductor devices, for working hard materials 17.3 26.6 38.6 9.0
3495 Powered handtools, pneumatic, hydraulic, or with a self-contained electric 16.6 22.1 19.4 11.9
3496 Machines and apparatus, and wire, rods, tubes, plates, electrodes and 24.8 26.3 44.3 S
3497 Ball or roller bearings, transmission shafts and cranks, bearing housings 11.6 14.1 13.8 13.8
3499 Other 17.3 0.2 30.4 31.1 9.4
3511 Electric motors, generators, generating sets, and rotary converters 10.2 25.1 18.8 18.1
3512 Electric or electronic transformers, static converters, including 15.5 23.4 22.5 15.7
3521 Electric cooking appliances 24.6 25.0 32.3 12.2
3522 Electromechanical or electrothermic domestic appliances, except cooking 26.0 S S S S 7.7
3531 Telephone or telegraph switching apparatus, except parts 20.1 28.2 28.2 18.0
3539 Other 31.8 0.2 28.7 38.1 7.2
3540 Electronic entertainment products, except parts 17.6 0.1 17.4 14.8 8.0
3551 Computer equipment 11.3 0.2 13.3 13.8 5.9
3552 Office equipment 16.5 15.2 22.3 11.5
3561 Prepared unrecorded media for audio, video, computer, or other uses S S 26.1 27.1 10.5
3562 Pre-recorded media 14.4 17.6 17.5 3.9
3570 Transmission apparatus for radio or television broadcasting, radio 15.0 23.6 26.5 7.6
3581 Electronic parts 11.7 0.2 S S 43.4 4.6
3582 Parts of the goods of SCTG 354 and 357 15.4 19.3 23.9 21.5
3591 Primary and storage batteries 22.0 29.1 39.1 20.3
3592 Apparatus for switching or protecting electrical circuits or for making 10.0 11.7 13.9 13.4
3599 Other 14.1 0.3 17.8 21.1 12.2
3610 Motor vehicles for the transport of less than 11.1 0.3 10.3 16.2 15.4
3621 Motor vehicles for the transport of goods, except parts 12.0 22.2 28.2 S
3622 Road tractors for semitrailers, except parts 17.7 15.6 27.9 17.9
3631 Tractors, except road tractors, work tractors, and parts 11.9 15.4 18.7 S
3632 Motor vehicles for the transport of people wit S S S S S S 33.9
3633 Special-purpose motor vehicles, except parts 18.7 17.4 25.5 13.4
3634 Motor vehicle chassis fitted with engines and separately shipped bodies 34.2 28.8 25.5 43.9
3635 Motorcycles, bicycles, and other cycles 23.1 23.3 28.5 5.9
3636 Trailers and semitrailers 13.0 14.7 15.4 23.1
3639 Other 34.1 40.0 42.3 15.5
3640 Parts and accessories for motor vehicles, except for motorcycles and 12.1 0.5 10.8 14.4 0.1 8.3
3710 Locomotives and rolling stock, railway track fixtures and fittings, 27.9 44.0 46.1 0.2 7.8
3721 Aircraft, except parts S S S S 34.9 15.7
3722 Spacecraft and suborbital and spacecraft launch vehicles, except parts S S S S S S 17.1
3723 Parts of aircraft and spacecraft 15.7 0.1 17.6 31.1 4.5
3724 Parachutes, rotochutes, aircraft-launching gea S S S S S S 30.9
3731 Pleasure or sporting vessels 17.3 17.6 18.5 15.4
3732 Commercial ships and boats and floating structures 44.5 38.1 28.5 14.5
3810 Optical elements, instruments, and apparatus, except photographic and 19.0 28.4 26.4 11.6
3821 Photographic cameras, image projectors, enlargers and reducers, projection 18.9 18.2 22.6 10.5
3822 Photocopying and thermocopying apparatus 27.9 30.5 39.3 16.2
3831 Navigational instruments and appliances, except radar and other radio-type 35.9 34.9 46.5 11.7
3832 Surveying,hydrographic, oceanographic, hydrological, meteorological, 38.5 S S S S 13.8
3841 Apparatus based on the use of X-rays or alpha, beta, or gamma radiation S S S S 44.3 S
3842 Electromedical equipment 35.3 22.6 29.9 14.7
3849 Other 16.9 0.2 21.1 21.4 8.5
3851 Instruments and apparatus for measuring or checking electrical quantities 26.0 16.6 28.3 22.8
3852 Industrial process-control instruments 20.8 25.8 29.1 14.5
3859 Other 10.3 18.9 22.4 6.0
3901 Household or office furniture 6.7 16.4 8.5 6.8
3902 Other furniture 11.6 19.2 11.7 7.7
3903 Lighting equipment, except for motor vehicles, lamps, lighting fittings, 15.1 14.1 14.2 15.0
4011 Arms 15.1 30.3 27.7 4.2
4012 Munitions and ammunition 34.9 37.4 33.4 9.7
4021 Toys and games 31.0 0.1 29.2 45.1 7.3
4022 Sporting equipment 13.8 24.7 19.8 5.0
4091 Clocks and watches S S 41.5 47.1 8.4
4092 Prefabricated buildings 9.2 10.4 11.3 14.3
4093 Writing or drawing instruments and inked ribbons and pads 19.2 38.9 S S 12.2
4094 Precious metal forms and shapes, pearls, precious or semiprecious stones, 25.8 0.1 42.9 42.6 6.4
4099 Other 5.6 0.2 11.4 6.4 4.6
4111 Slag, ash, and residues 46.6 44.7 45.9 S
4112 Of ferrous metal 21.2 21.2 0.3 37.3 0.3 13.7
4113 Of nonferrous metal, including precious 19.4 19.5 21.5 11.9
4121 Sawdust and wood waste and scrap 42.5 38.3 S S 16.0
4122 Of paper or paperboard 27.7 31.3 30.9 17.4
4129 Other 34.0 31.2 42.7 23.3
4399 Mixed freight 3.6 0.4 5.6 0.1 5.0 0.1 7.9
-- Commodity unknown 9.9 22.3 41.7 0.1 8.8

KEY:
– Represents data cell equal to zero or less than 1 unit of measure.
S Estimate does not meet publication standards because of high sampling variability or poor response quality.

NOTE: The Introduction and appendixes give information on confidentiality protection, sampling error, nonsampling error, sample design, and definitions. Links to this information on the Internet may be found at www.census.gov/cfs.

SOURCE: Bureau of Transportation Statistics (USDOT) and U.S. Census Bureau, 2002 Commodity Flow Survey, United States Data, December 2004.