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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Table 4. Shipment Characteristics by Mode of Transportation and Shipment Weight for State of Origin: 2007

Tuesday, July 3, 2012

Table 4. Shipment Characteristics by Mode of Transportation and Shipment Weight for State of Origin: 2007

Estimates are based on the 2007 Commodity Flow Survey. Because of rounding, estimates may not be additive.

Excel | CSV

All modes

Shipment Weight Value Tons Ton-miles1 Average miles per shipment Value Tons Ton-miles Average miles per shipment CV
2007
(million $)		 Percent 2007
(thousands)		 Percent 2007
(millions)		 Percent CV2 Standard
Error of %		 CV Standard
Error of %		 CV Standard
Error of %
Total 18,184 100 28,743 100 12,633 100 176 15.9 - 16.4 - 15.9 - 24.7
Less than 50 lbs 673 3.7 25 0.1 4 - 209 9.9 0.8 18.2 - 38.4 - 20.3
50 - 99 lbs 468 2.6 36 0.1 5 - 142 40.9 1.7 36.3 - 22.3 - 47.8
100 - 499 lbs 1,333 7.3 315 1.1 41 0.3 119 17.3 2.1 27.9 0.2 31.8 0.2 26.6
500 - 749 lbs 385 2.1 192 0.7 45 0.4 233 17.3 0.4 27 0.2 43.8 0.3 22.9
750 - 999 lbs 263 1.4 157 0.5 33 0.3 210 16.5 0.4 26.7 0.2 42 0.2 32.3
1,000 - 9,999 lbs 2,336 12.8 1,782 6.2 335 2.7 197 12.4 2.8 15.2 1.6 38.3 1.5 24.8
10,000 - 49,999 lbs 4,103 22.6 9,227 32.1 1,214 9.6 146 18.4 3 20.9 5.5 36.5 3.2 35.9
50,000 - 99,999 lbs 1,840 10.1 4,011 14 508 4 123 26.5 2.3 21.8 2.6 26.7 1 37.3
More than 100,000 lbs 6,784 37.3 12,997 45.2 10,448 82.7 S 31.2 6.1 30.1 7.6 19.2 5.2 S

Single modes

Shipment Weight Value Tons Ton-miles1 Average miles per shipment Value Tons Ton-miles Average miles per shipment CV
2007
(million $)		 Percent 2007
(thousands)		 Percent 2007
(millions)		 Percent CV2 Standard
Error of %		 CV Standard
Error of %		 CV Standard
Error of %
Total 16,124 100 27,070 100 10,299 100 133 18.1 - 17.6 - 17.3 - 24.8
Less than 50 lbs 391 2.4 19 0.1 2 - 155 11.4 0.8 25.4 - 42.3 - 24.9
50 - 99 lbs 264 1.6 30 0.1 3 - S 20.4 0.7 44.9 - 28.4 - S
100 - 499 lbs 1,105 6.9 251 0.9 25 0.2 88 22.4 2.5 32.8 0.2 26.5 0.1 30
500 - 749 lbs 297 1.8 138 0.5 24 0.2 177 16.7 0.4 17.3 0.1 40.2 0.1 23.6
750 - 999 lbs 223 1.4 120 0.4 19 0.2 154 13.9 0.4 16.6 0.1 43.5 0.1 25.3
1,000 - 9,999 lbs 2,057 12.8 1,556 5.7 251 2.4 163 11.8 2.9 12.6 1.6 43.5 1.3 24.4
10,000 - 49,999 lbs 3,678 22.8 8,861 32.7 1,014 9.8 122 19.3 3.3 22.1 5.8 39.3 2.8 40
50,000 - 99,999 lbs 1,488 9.2 3,656 13.5 306 3 82 27.7 2 23.7 2.9 24.7 0.6 22.9
More than 100,000 lbs 6,620 41.1 12,439 46 8,654 84 286 32.2 6.3 31.9 8 19.3 4.3 14.3

Truck3

Shipment Weight Value Tons Ton-miles1 Average miles per shipment Value Tons Ton-miles Average miles per shipment CV
2007
(million $)		 Percent 2007
(thousands)		 Percent 2007
(millions)		 Percent CV2 Standard
Error of %		 CV Standard
Error of %		 CV Standard
Error of %
Total 8,032 100 15,139 100 665 100 64 11 - 16.9 - 13.2 - 13.4
Less than 50 lbs 320 4 18 0.1 1 0.2 75 10.7 1 25.8 - 11 - 38.2
50 - 99 lbs 189 2.4 29 0.2 1 0.2 52 16.5 0.4 47.4 0.1 19.9 0.1 23.1
100 - 499 lbs 671 8.4 235 1.6 12 1.9 50 13.4 1 35.4 0.5 9.7 0.2 22.3
500 - 749 lbs 226 2.8 121 0.8 10 1.5 83 10.4 0.3 17.4 0.1 18.5 0.6 32.1
750 - 999 lbs 200 2.5 107 0.7 8 1.2 74 12.4 0.5 15.2 0.2 34.5 0.3 17.2
1,000 - 9,999 lbs 1,772 22.1 1,379 9.1 105 15.7 78 11.9 2.6 11.9 1.3 18.3 3.2 11.9
10,000 - 49,999 lbs 2,376 29.6 8,002 52.9 326 49.1 43 19.8 4.1 25 5.7 20.1 4.4 23.3
50,000 - 99,999 lbs 1,200 14.9 3,364 22.2 148 22.2 S 26.7 3.7 24.6 4 14.7 3.1 S
More than 100,000 lbs 1,077 13.4 S S 53 8 S 36.1 3.2 S S 49.4 3 S

For-hire truck

Shipment Weight Value Tons Ton-miles1 Average miles per shipment Value Tons Ton-miles Average miles per shipment CV
2007
(million $)		 Percent 2007
(thousands)		 Percent 2007
(millions)		 Percent CV2 Standard
Error of %		 CV Standard
Error of %		 CV Standard
Error of %
Total 2,333 100 3,663 100 326 100 239 14.7 - 35.5 - 20.1 - 17.9
Less than 50 lbs 117 5 2 0.1 1 0.2 255 29 4 40.8 0.3 20.5 0.1 28.6
50 - 99 lbs 41 1.8 2 - 1 0.2 311 23.5 1.1 22.8 0.1 24.4 0.2 20.8
100 - 499 lbs 142 6.1 16 0.4 5 1.6 320 9.6 1.2 16.4 0.8 9.5 0.9 17
500 - 749 lbs 63 2.7 15 0.4 6 1.7 375 25.6 0.7 44.2 0.8 32.6 2 47.4
750 - 999 lbs 54 2.3 S S 2 0.7 165 39.7 1.1 S S 43.9 0.5 25.2
1,000 - 9,999 lbs 423 18.1 223 6.1 50 15.2 232 17.4 3.5 24 6.8 19.3 7.2 15.1
10,000 - 49,999 lbs 892 38.2 1,870 51.1 170 52 103 25.8 7.2 36.8 7.6 25.7 7 47.8
50,000 - 99,999 lbs 553 23.7 1,475 40.3 84 25.9 S 46.1 6.4 48.8 7.6 26.7 4.2 S
More than 100,000 lbs S S 46 1.3 S S 188 S S 35.2 7.6 S S 36.9

Private truck

Shipment Weight Value Tons Ton-miles1 Average miles per shipment Value Tons Ton-miles Average miles per shipment CV
2007
(million $)		 Percent 2007
(thousands)		 Percent 2007
(millions)		 Percent CV2 Standard
Error of %		 CV Standard
Error of %		 CV Standard
Error of %
Total 5,699 100 11,476 100 339 100 34 10.8 - 17.3 - 10.7 - 16.6
Less than 50 lbs 203 3.6 15 0.1 - 0.1 26 14.2 0.6 31.5 - 23.4 - 7.9
50 - 99 lbs 148 2.6 S S 1 0.3 34 20.6 0.4 S S 29.9 0.1 19.6
100 - 499 lbs 530 9.3 219 1.9 7 2.1 32 17.5 1.2 38.2 0.6 16.4 0.2 22
500 - 749 lbs 164 2.9 106 0.9 4 1.3 41 12.2 0.2 21.5 0.2 31.7 0.3 22.1
750 - 999 lbs 146 2.6 94 0.8 6 1.7 61 10.4 0.4 18.1 0.3 47.4 0.5 21.2
1,000 - 9,999 lbs 1,350 23.7 1,156 10.1 55 16.3 52 13.9 3.7 14.5 1.7 34.7 3.5 15.2
10,000 - 49,999 lbs 1,484 26 6,132 53.4 157 46.3 26 27.3 5.1 28.1 6.8 20.7 6.5 19.2
50,000 - 99,999 lbs 646 11.3 1,889 16.5 63 18.7 33 42.5 4.7 28.8 4.9 26.9 5.2 35.6
More than 100,000 lbs 1,028 18 S S S S S 38.6 5.2 S S S S S

Rail

Shipment Weight Value Tons Ton-miles1 Average miles per shipment Value Tons Ton-miles Average miles per shipment CV
2007
(million $)		 Percent 2007
(thousands)		 Percent 2007
(millions)		 Percent CV2 Standard
Error of %		 CV Standard
Error of %		 CV Standard
Error of %
Total S S 5,214 100 S S 329 S S 42.9 - S S 30.3
Less than 50 lbs - - - - - - - - - - - - - -
50 - 99 lbs - - - - - - - - - - - - - -
100 - 499 lbs - - - - - - - - - - - - - -
500 - 749 lbs - - - - - - - - - - - - - -
750 - 999 lbs - - - - - - - - - - - - - -
1,000 - 9,999 lbs S S S S S S S S S S S S S S
10,000 - 49,999 lbs S S S S S S S S S S S S S S
50,000 - 99,999 lbs S S S S S S S S S S S S S S
More than 100,000 lbs S S 5,148 98.7 S S 351 S S 43.9 2.8 S S 31

Water

Shipment Weight Value Tons Ton-miles1 Average miles per shipment Value Tons Ton-miles Average miles per shipment CV
2007
(million $)		 Percent 2007
(thousands)		 Percent 2007
(millions)		 Percent CV2 Standard
Error of %		 CV Standard
Error of %		 CV Standard
Error of %
Total 2,896 100 3,333 100 7,589 100 891 21.6 - 29.4 - 18.9 - 20.6
Less than 50 lbs S S - - S S 173 S S 49.2 - S S 48.5
50 - 99 lbs 1 - S S S S 831 24.2 - S S S S 35.5
100 - 499 lbs 14 0.5 S S S S 847 40.7 0.3 S S S S 30.3
500 - 749 lbs 15 0.5 S S S S 879 43.7 0.4 S S S S 34.7
750 - 999 lbs 10 0.3 10 0.3 S S 829 31.5 0.3 40.1 0.6 S S 31.7
1,000 - 9,999 lbs S S S S S S 914 S S S S S S 31.7
10,000 - 49,999 lbs 845 29.2 S S S S 1,103 40.4 7.7 S S S S 16.4
50,000 - 99,999 lbs 279 9.6 263 7.9 153 2 560 33.4 4.1 35.9 3.4 34 0.7 40.8
More than 100,000 lbs 1,612 55.7 2,480 74.4 6,786 89.4 1,608 35.3 9.2 39.2 8.2 21.6 4.9 32

Shallow draft

Shipment Weight Value Tons Ton-miles1 Average miles per shipment Value Tons Ton-miles Average miles per shipment CV
2007
(million $)		 Percent 2007
(thousands)		 Percent 2007
(millions)		 Percent CV2 Standard
Error of %		 CV Standard
Error of %		 CV Standard
Error of %
Total S S S S S S S S S S S S S S
Less than 50 lbs S S S S S S S S S S S S S S
50 - 99 lbs S S S S S S S S S S S S S S
100 - 499 lbs S S S S S S S S S S S S S S
500 - 749 lbs - - - - - - - - - - - - - -
750 - 999 lbs - - - - - - - - - - - - - -
1,000 - 9,999 lbs S S S S S S S S S S S S S S
10,000 - 49,999 lbs S S S S S S S S S S S S S S
50,000 - 99,999 lbs - - - - - - - - - - - - - -
More than 100,000 lbs - - - - - - - - - - - - - -

Deep draft

Shipment Weight Value Tons Ton-miles1 Average miles per shipment Value Tons Ton-miles Average miles per shipment CV
2007
(million $)		 Percent 2007
(thousands)		 Percent 2007
(millions)		 Percent CV2 Standard
Error of %		 CV Standard
Error of %		 CV Standard
Error of %
Total 2,885 100 3,330 100 7,589 100 896 21.8 - 29.5 - 18.9 - 20.1
Less than 50 lbs S S S S S S 257 S S S S S S 22.4
50 - 99 lbs - - S S S S 870 19.7 - S S S S 32.5
100 - 499 lbs 14 0.5 S S S S 850 43 0.3 S S S S 30.1
500 - 749 lbs 15 0.5 S S S S 879 43.7 0.4 S S S S 34.7
750 - 999 lbs 10 0.3 10 0.3 S S 829 31.5 0.3 40.1 0.6 S S 31.7
1,000 - 9,999 lbs S S S S S S 917 S S S S S S 31.2
10,000 - 49,999 lbs 836 29 S S S S 1,106 41.1 7.8 S S S S 16.1
50,000 - 99,999 lbs 279 9.7 263 7.9 153 2 560 33.4 4.1 35.9 3.4 34 0.7 40.8
More than 100,000 lbs 1,612 55.9 2,480 74.5 6,786 89.4 1,608 35.3 9.4 39.2 8.2 21.6 4.9 32

Air (incl truck and air)

Shipment Weight Value Tons Ton-miles1 Average miles per shipment Value Tons Ton-miles Average miles per shipment CV
2007
(million $)		 Percent 2007
(thousands)		 Percent 2007
(millions)		 Percent CV2 Standard
Error of %		 CV Standard
Error of %		 CV Standard
Error of %
Total 1,241 100 S S S S 1,309 31.7 - S S S S 20
Less than 50 lbs 70 5.6 1 0.2 S S 1,633 41.3 4 38.1 0.5 S S 20.9
50 - 99 lbs S S 1 0.3 S S 1,544 S S 33.6 1.3 S S 26.5
100 - 499 lbs S S 4 1.1 3 1.3 742 S S 15.6 6.4 13.9 6.1 17.9
500 - 749 lbs S S 2 0.6 2 0.8 843 S S 31.2 4.1 32.6 3.2 21.6
750 - 999 lbs 13 1 2 0.6 2 0.9 1,009 29 0.5 31.6 2.1 28.4 2.8 44.5
1,000 - 9,999 lbs 149 12 24 6.2 26 10.3 1,215 21.8 8 21.1 13.9 28.4 12.8 19.5
10,000 - 49,999 lbs S S S S S S S S S S S S S S
50,000 - 99,999 lbs - - - - - - - - - - - - - -
More than 100,000 lbs S S S S S S S S S S S S S S

Pipeline4

Shipment Weight Value Tons Ton-miles1 Average miles per shipment Value Tons Ton-miles Average miles per shipment CV
2007
(million $)		 Percent 2007
(thousands)		 Percent 2007
(millions)		 Percent CV2 Standard
Error of %		 CV Standard
Error of %		 CV Standard
Error of %
Total 2,091 100 2,997 100 S S S 37.9 - 40.6 - S S S
Less than 50 lbs - - - - - - - - - - - - - -
50 - 99 lbs - - - - - - - - - - - - - -
100 - 499 lbs S S S S S S S S S S S S S S
500 - 749 lbs S S S S S S S S S S S S S S
750 - 999 lbs S S S S S S S S S S S S S S
1,000 - 9,999 lbs S S S S S S S S S S S S S S
10,000 - 49,999 lbs S S S S S S S S S S S S S S
50,000 - 99,999 lbs 9 0.4 15 0.5 S S S 21.6 0.3 23.2 1.2 S S S
More than 100,000 lbs 2,027 97 2,916 97.3 S S S 39.5 10.1 42 10.1 S S S

Multiple modes

Shipment Weight Value Tons Ton-miles1 Average miles per shipment Value Tons Ton-miles Average miles per shipment CV
2007
(million $)		 Percent 2007
(thousands)		 Percent 2007
(millions)		 Percent CV2 Standard
Error of %		 CV Standard
Error of %		 CV Standard
Error of %
Total 1,050 100 688 100 S S 615 18 - 36.7 - S S 20.3
Less than 50 lbs 170 16.2 2 0.3 S S 581 29.4 4.2 20.4 2.4 S S 19.9
50 - 99 lbs S S 1 0.2 1 - 400 S S 26.7 1.5 20.4 2.2 30.4
100 - 499 lbs 117 11.1 6 0.8 4 0.2 530 47.8 4.7 26.7 4.2 49.9 5.1 21.5
500 - 749 lbs 39 3.7 4 0.5 3 0.2 800 45.2 3.5 25.9 4.1 48.7 2.6 23.2
750 - 999 lbs S S S S S S 2,260 S S S S S S 47.7
1,000 - 9,999 lbs S S S S S S 2,421 S S S S S S 25.1
10,000 - 49,999 lbs 163 15.5 S S 54 2.7 636 40.6 9.5 S S 28.8 16 46.3
50,000 - 99,999 lbs S S S S S S S S S S S S S S
More than 100,000 lbs S S S S S S S S S S S S S S

Parcel, U.S.P.S. or courier

Shipment Weight Value Tons Ton-miles1 Average miles per shipment Value Tons Ton-miles Average miles per shipment CV
2007
(million $)		 Percent 2007
(thousands)		 Percent 2007
(millions)		 Percent CV2 Standard
Error of %		 CV Standard
Error of %		 CV Standard
Error of %
Total 495 100 12 100 6 100 554 48.4 - 19.9 - 28.6 - 19.3
Less than 50 lbs 170 34.4 2 18.7 1 21.4 576 29.5 7.5 20.2 3.3 49.4 3.8 19.7
50 - 99 lbs S S 1 11.4 1 8.9 392 S S 24.8 3.2 18.6 5 23.6
100 - 499 lbs S S 5 42.8 S S 464 S S 27.9 5.5 S S 18.9
500 - 749 lbs S S 3 22.9 2 25 550 S S 29 4.4 27.9 6.7 29.2
750 - 999 lbs 2 0.4 1 4.2 S S S 31 2.2 41.2 3.8 S S S
1,000 - 9,999 lbs - - - - - - - - - - - - - -
10,000 - 49,999 lbs - - - - - - - - - - - - - -
50,000 - 99,999 lbs - - - - - - - - - - - - - -
More than 100,000 lbs - - - - - - - - - - - - - -

Truck and rail

Shipment Weight Value Tons Ton-miles1 Average miles per shipment Value Tons Ton-miles Average miles per shipment CV
2007
(million $)		 Percent 2007
(thousands)		 Percent 2007
(millions)		 Percent CV2 Standard
Error of %		 CV Standard
Error of %		 CV Standard
Error of %
Total S S S S S S S S S S S S S S
Less than 50 lbs - - - - - - - - - - - - - -
50 - 99 lbs - - - - - - - - - - - - - -
100 - 499 lbs S S S S S S S S S S S S S S
500 - 749 lbs - - - - - - - - - - - - - -
750 - 999 lbs - - - - - - - - - - - - - -
1,000 - 9,999 lbs - - - - - - - - - - - - - -
10,000 - 49,999 lbs - - - - - - - - - - - - - -
50,000 - 99,999 lbs - - - - - - - - - - - - - -
More than 100,000 lbs - - - - - - - - - - - - - -

Truck and water

Shipment Weight Value Tons Ton-miles1 Average miles per shipment Value Tons Ton-miles Average miles per shipment CV
2007
(million $)		 Percent 2007
(thousands)		 Percent 2007
(millions)		 Percent CV2 Standard
Error of %		 CV Standard
Error of %		 CV Standard
Error of %
Total 488 100 509 100 S S 1,716 29 - 42.3 - S S 22.7
Less than 50 lbs S S S S S S S S S S S S S S
50 - 99 lbs - 0.1 S S S S 1,174 25.4 6.3 S S S S 13.9
100 - 499 lbs S S S S S S 1,501 S S S S S S 36.4
500 - 749 lbs S S S S S S S S S S S S S S
750 - 999 lbs S S S S S S S S S S S S S S
1,000 - 9,999 lbs S S S S S S 2,421 S S S S S S 25.1
10,000 - 49,999 lbs 143 29.3 S S 47 2.8 S 47 13.9 S S 29.6 18.6 S
50,000 - 99,999 lbs S S S S S S S S S S S S S S
More than 100,000 lbs S S S S S S S S S S S S S S

Rail and water

Shipment Weight Value Tons Ton-miles1 Average miles per shipment Value Tons Ton-miles Average miles per shipment CV
2007
(million $)		 Percent 2007
(thousands)		 Percent 2007
(millions)		 Percent CV2 Standard
Error of %		 CV Standard
Error of %		 CV Standard
Error of %
Total S S S S S S S S S S S S S S
Less than 50 lbs - - - - - - - - - - - - - -
50 - 99 lbs - - - - - - - - - - - - - -
100 - 499 lbs - - - - - - - - - - - - - -
500 - 749 lbs - - - - - - - - - - - - - -
750 - 999 lbs - - - - - - - - - - - - - -
1,000 - 9,999 lbs - - - - - - - - - - - - - -
10,000 - 49,999 lbs - - - - - - - - - - - - - -
50,000 - 99,999 lbs - - - - - - - - - - - - - -
More than 100,000 lbs S S S S S S S S S S S S S S

Other multiple modes

Shipment Weight Value Tons Ton-miles1 Average miles per shipment Value Tons Ton-miles Average miles per shipment CV
2007
(million $)		 Percent 2007
(thousands)		 Percent 2007
(millions)		 Percent CV2 Standard
Error of %		 CV Standard
Error of %		 CV Standard
Error of %
Total S S S S S S 1,501 S S S S S S 33.5
Less than 50 lbs - - - - - - - - - - - - - -
50 - 99 lbs - - - - - - - - - - - - - -
100 - 499 lbs - - - - - - - - - - - - - -
500 - 749 lbs - - - - - - - - - - - - - -
750 - 999 lbs - - - - - - - - - - - - - -
1,000 - 9,999 lbs - - - - - - - - - - - - - -
10,000 - 49,999 lbs S S S S S S 1,048 S S S S S S 43.9
50,000 - 99,999 lbs S S S S S S S S S S S S S S
More than 100,000 lbs - - - - - - - - - - - - - -

Other and unknown modes

Shipment Weight Value Tons Ton-miles1 Average miles per shipment Value Tons Ton-miles Average miles per shipment CV
2007
(million $)		 Percent 2007
(thousands)		 Percent 2007
(millions)		 Percent CV2 Standard
Error of %		 CV Standard
Error of %		 CV Standard
Error of %
Total 1,011 100 985 100 313 100 212 28.3 - 37.2 - 47 - 22.5
Less than 50 lbs 112 11.1 4 0.4 1 0.2 112 38.5 7.4 33.5 0.9 43.6 0.5 32.1
50 - 99 lbs 25 2.5 S S S S 217 33 0.4 S S S S 17.9
100 - 499 lbs 111 11 S S S S 223 43 2.8 S S S S 23.8
500 - 749 lbs S S S S S S 343 S S S S S S 27.4
750 - 999 lbs S S S S S S 264 S S S S S S 33.3
1,000 - 9,999 lbs 234 23.2 S S 66 21.1 319 44.9 6.4 S S 46.9 6 21.8
10,000 - 49,999 lbs 262 25.9 284 28.8 S S 556 34.5 7.9 43.8 7.5 S S 16.4
50,000 - 99,999 lbs 120 11.9 139 14.1 S S S 14.1 6.6 17.9 15.7 S S S
More than 100,000 lbs S S S S S S S S S S S S S S

KEY: S = Estimate does not meet publication standards because of high sampling variability or poor response quality. - = Zero or Less than half the unit shown; thus, it has been rounded to zero.

1 Ton-miles estimates are based on estimated distances traveled along a modeled transportation network.
2 Coefficient of Variation.
3 "Truck" as a single mode includes shipments that were made by only private truck, only for-hire truck, or a combination of private truck and for-hire truck.
4 Estimates for pipeline exclude shipments of crude petroleum.

NOTES: Rows are not shown if all cells for that particular state by mode have no data. For example, since North Carolina by "Pipeline" has no data for any weight grouping, the entire mode of "Pipeline" for that state was removed from this table. However, if a state by mode has at least one row of data for one of the weight groupings, then the entire state by mode is shown even though there may be rows absent of data within that mode. For example, North Carolina by "Air" has a few rows absent of data but since the other rows within that mode do have data, that state by mode will be shown in its entirety for all the weight groupings. Value-of-shipments estimates have not been adjusted for price changes. Estimated measures of sampling variability for each estimate known as coefficients of variation (CV) are also provided in these tables. More information on sampling error, confidentiality protection, nonsampling error, sample design, and definitions may be found at http://www.bts.gov/publications/commodity_flow_survey/.

SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics and U.S. Department of Commerce, U.S. Census Bureau, 2007 Economic Census: Transportation Commodity Flow Survey, December 2009.