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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 433,270 100 328,935 100 67,397 100 623 11.4 - 14 - 20.3 - 3.8
Less than 50 lbs 45,789 10.6 718 0.2 429 0.6 731 18.7 2.2 9.8 - 9.6 0.1 4.2
50 - 99 lbs 11,389 2.6 442 0.1 199 0.3 448 18.8 0.5 10.8 - 10.8 - 15.2
100 - 499 lbs 35,785 8.3 1,847 0.6 700 1 390 17.3 2 4.2 0.1 7.4 0.2 5.9
500 - 749 lbs 6,596 1.5 942 0.3 341 0.5 360 7.8 0.3 6.7 - 10.8 0.1 9
750 - 999 lbs 6,266 1.4 782 0.2 259 0.4 329 35 0.4 5.4 - 8.1 0.1 7.9
1,000 - 9,999 lbs 112,126 25.9 16,007 4.9 5,047 7.5 321 16.1 2.2 4.4 0.6 5.7 1 4.8
10,000 - 49,999 lbs 195,360 45.1 189,471 57.6 27,550 40.9 168 16.9 3.1 9.5 3.5 6.3 4.8 8.5
50,000 - 99,999 lbs 11,299 2.6 43,901 13.3 2,985 4.4 67 9 0.3 12.2 2 7.4 0.6 12.4
More than 100,000 lbs 8,660 2 74,827 22.7 29,886 44.3 451 15.6 0.3 47.9 4.9 43.9 6.3 9.9

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 370,535 100 313,831 100 59,836 100 268 12.3 - 14.9 - 23.4 - 8.9
Less than 50 lbs 10,741 2.9 246 0.1 43 0.1 305 25.7 1.1 14.8 - 14.8 - 15
50 - 99 lbs 3,712 1 258 0.1 38 0.1 138 18 0.3 19.8 - 19 - 12
100 - 499 lbs 27,117 7.3 1,505 0.5 470 0.8 299 23.2 2.3 5 0.1 8.6 0.1 6.3
500 - 749 lbs 5,858 1.6 863 0.3 302 0.5 348 7.5 0.3 6.4 - 11.4 0.1 9.4
750 - 999 lbs 6,058 1.6 750 0.2 251 0.4 333 34.2 0.4 4.8 - 8.5 0.1 7.8
1,000 - 9,999 lbs 110,097 29.7 15,610 5 4,875 8.1 315 16.4 2.4 4.7 0.6 6.1 1.1 4.7
10,000 - 49,999 lbs 190,296 51.4 184,934 58.9 25,721 43 160 17.3 3 9.5 3.7 6.6 5.3 7.8
50,000 - 99,999 lbs 9,861 2.7 42,454 13.5 2,706 4.5 63 7.6 0.4 12.3 2.1 7 0.6 12.7
More than 100,000 lbs 6,796 1.8 S S S S 442 17.9 0.3 S S S S 11.1

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 355,137 100 298,742 100 51,159 100 242 13.4 - 16 - 28.6 - 8.2
Less than 50 lbs 4,526 1.3 238 0.1 36 0.1 249 20.8 0.2 15.6 - 18 - 15.1
50 - 99 lbs 2,894 0.8 256 0.1 36 0.1 132 18.8 0.2 19.9 - 18.9 - 11.3
100 - 499 lbs 24,555 6.9 1,494 0.5 462 0.9 296 21.3 2.3 5 0.1 8.8 0.2 6.5
500 - 749 lbs 5,830 1.6 862 0.3 301 0.6 347 7.6 0.4 6.5 - 11.5 0.1 9.4
750 - 999 lbs 6,035 1.7 746 0.2 248 0.5 329 34.4 0.4 5.1 - 8.8 0.1 7.8
1,000 - 9,999 lbs 109,926 31 15,599 5.2 4,868 9.5 314 16.5 2.4 4.7 0.7 6.1 1.6 4.7
10,000 - 49,999 lbs 189,801 53.4 184,693 61.8 25,515 49.9 159 17.4 2.5 9.5 4.1 6.6 7.3 7.9
50,000 - 99,999 lbs 9,751 2.7 42,288 14.2 2,649 5.2 62 7.5 0.5 12.2 2.3 6.9 0.9 12.7
More than 100,000 lbs 1,818 0.5 S S S S 289 26 0.1 S S S S 15.4

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 289,638 100 168,907 100 44,714 100 596 16 - 23.5 - 31.9 - 7.4
Less than 50 lbs 1,345 0.5 34 - 23 0.1 739 19.5 0.1 15.6 - 25.9 - 10.8
50 - 99 lbs 1,244 0.4 33 - 20 - 617 46 0.2 22.4 - 18.6 - 10.6
100 - 499 lbs 19,656 6.8 566 0.3 395 0.9 692 27.6 3 9.8 0.1 11.2 0.3 4.5
500 - 749 lbs 3,881 1.3 360 0.2 260 0.6 720 13.4 0.4 11.2 - 13.7 0.1 5.1
750 - 999 lbs 4,678 1.6 327 0.2 216 0.5 659 44.9 0.5 10.6 - 10.8 0.1 4.5
1,000 - 9,999 lbs 82,336 28.4 6,742 4 3,851 8.6 609 20.6 2.2 5.4 0.7 5.5 1.7 3.7
10,000 - 49,999 lbs 167,761 57.9 89,325 52.9 21,179 47.4 275 19.5 2.3 10.2 6.2 7.4 8.2 7.5
50,000 - 99,999 lbs 7,067 2.4 20,235 12 1,813 4.1 90 10.7 0.4 15.8 3.3 10.3 1 14.2
More than 100,000 lbs 1,671 0.6 S S S S 307 28.4 0.1 S S S S 16.6

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 65,498 100 129,835 100 6,446 100 67 7.5 - 11.6 - 8.4 - 5.8
Less than 50 lbs 3,180 4.9 204 0.2 13 0.2 59 26.2 0.9 18.1 - 26 0.1 10.8
50 - 99 lbs 1,650 2.5 223 0.2 15 0.2 71 15.3 0.4 22.4 - 26.4 0.1 8.5
100 - 499 lbs 4,899 7.5 928 0.7 67 1 70 7.4 0.8 6.8 0.2 8.3 0.2 6.5
500 - 749 lbs 1,949 3 502 0.4 42 0.6 81 8.8 0.3 10.9 0.1 15.5 0.1 8.1
750 - 999 lbs 1,358 2.1 419 0.3 32 0.5 76 6.8 0.2 9.1 0.1 15.1 0.1 11
1,000 - 9,999 lbs 27,590 42.1 8,857 6.8 1,017 15.8 108 16.6 3.7 7.2 1.3 13.1 1.9 7.6
10,000 - 49,999 lbs 22,040 33.7 95,368 73.5 4,336 67.3 49 7.7 3.1 12.2 2.8 10.1 2.3 10.2
50,000 - 99,999 lbs 2,684 4.1 22,052 17 836 13 39 16.3 0.9 24 2.8 17.4 1.9 24.8
More than 100,000 lbs 148 0.2 1,281 1 88 1.4 S 27.1 0.1 39 0.4 35.9 0.5 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 4,664 100 11,427 100 7,450 100 745 19.7 - 18.5 - 17.4 - 5.5
Less than 50 lbs S S S S S S S S S S S S S S
50 - 99 lbs - - - - - - - - - - - - - -
100 - 499 lbs S S - - S S S S S 39.1 - S S S
500 - 749 lbs S S - - S S S S S 48.9 - 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 5 - 3 - S S S 34.5 0.1 37.6 - S
10,000 - 49,999 lbs 228 4.9 231 2 204 2.7 957 29.3 2.6 37.5 2.2 23.8 2 21.8
50,000 - 99,999 lbs 100 2.1 154 1.4 58 0.8 S 43.9 1.6 41.2 1 46.2 0.3 S
More than 100,000 lbs 4,269 91.5 11,036 96.6 7,186 96.5 739 21.4 4.1 19.6 2.6 18.3 2 3.1

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 709 100 3,558 100 1,199 100 S 25.9 - 29.8 - 38.5 - 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 - - - - - - 3 24.7 0.1 28.9 - 28.9 - -
10,000 - 49,999 lbs 2 0.3 3 0.1 - - 3 18.3 0.7 16.2 0.6 16.2 0.7 -
50,000 - 99,999 lbs S S S S S S 3 S S S S S S -
More than 100,000 lbs 700 98.7 3,545 99.6 1,198 100 S 25.7 0.4 29.9 0.3 38.5 0.3 S

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 709 100 3,558 100 1,199 100 S 25.9 - 29.8 - 38.5 - 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 - - - - - - 3 24.7 0.1 28.9 - 28.9 - -
10,000 - 49,999 lbs 2 0.3 3 0.1 - - 3 18.3 0.7 16.2 0.6 16.2 0.7 -
50,000 - 99,999 lbs S S S S S S 3 S S S S S S -
More than 100,000 lbs 700 98.7 3,545 99.6 1,198 100 S 25.7 0.4 29.9 0.3 38.5 0.3 S

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 10,008 100 30 100 26 100 959 39.2 - 19.1 - 16.5 - 7.2
Less than 50 lbs 6,215 62.1 8 25.6 7 26.3 970 43.2 9.7 32.8 6.6 30.7 7 7.6
50 - 99 lbs S S 2 7.6 2 8.2 902 S S 38.2 2.1 42.3 3.5 27.9
100 - 499 lbs 2,561 25.6 11 35.1 7 28.3 702 45 9.5 29.8 7.3 32.1 6.3 20.8
500 - 749 lbs 17 0.2 S S S S 668 49.3 1.1 S S S S 33.5
750 - 999 lbs 22 0.2 S S 4 14 1,090 43.5 5 S S 35.9 11.4 45.4
1,000 - 9,999 lbs 117 1.2 5 16 5 18.1 1,140 34.1 4.8 26.4 2.8 30 3.6 17.5
10,000 - 49,999 lbs S S 1 2.3 S S S S S 34.3 9.3 S S S
50,000 - 99,999 lbs - - - - - - - - - - - - - -
More than 100,000 lbs - - - - - - - - - - - - - -

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 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 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 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

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 56,784 100 8,089 100 6,706 100 881 18 - 26.8 - 24.2 - 4.1
Less than 50 lbs 34,660 61 461 5.7 385 5.7 881 22.7 3.6 9.6 2.6 9.9 2.5 4.2
50 - 99 lbs 7,614 13.4 175 2.2 161 2.4 945 23.8 1.8 10.6 0.5 14.5 0.6 11.2
100 - 499 lbs 8,465 14.9 303 3.7 229 3.4 786 20 2.1 16.4 0.8 20.4 0.5 5.4
500 - 749 lbs 685 1.2 55 0.7 37 0.5 648 42.5 0.8 31.6 0.3 32 0.2 10.3
750 - 999 lbs S S 11 0.1 S S 505 S S 49.7 0.2 S S 36.5
1,000 - 9,999 lbs 268 0.5 30 0.4 33 0.5 1,091 39.2 0.2 33.8 0.2 43.8 0.4 20.4
10,000 - 49,999 lbs 2,056 3.6 980 12.1 1,349 20.1 1,442 20.4 0.9 19.4 2.7 20.6 3.8 7.6
50,000 - 99,999 lbs 1,086 1.9 328 4.1 215 3.2 612 35.6 1.4 25.5 2.4 23.3 1.9 34.9
More than 100,000 lbs 1,776 3.1 5,746 71 4,293 64 626 22 1.1 36.7 6.6 37 6.9 8.2

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 51,552 100 998 100 812 100 881 19.9 - 8 - 10 - 4.1
Less than 50 lbs 34,660 67.2 460 46.1 385 47.4 881 22.7 3.2 9.6 3.8 9.9 4.1 4.2
50 - 99 lbs 7,614 14.8 175 17.5 161 19.8 945 23.8 2.1 10.6 1.2 14.5 2.1 11.2
100 - 499 lbs 8,437 16.4 299 30 226 27.8 785 20.1 2.3 17 3.2 20.5 3.3 5.3
500 - 749 lbs 682 1.3 55 5.5 35 4.4 633 42.8 0.8 32 1.5 33.5 1.4 10.7
750 - 999 lbs S S S S S S 522 S S S S S S 20.7
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 4,284 100 3,598 100 2,928 100 940 19 - 22.3 - 18.5 - 10.3
Less than 50 lbs - - S S S S 710 13 - S S S S 3.4
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 207 4.8 26 0.7 S S 955 44.9 2.5 37.9 0.3 S S 29
10,000 - 49,999 lbs 1,850 43.2 921 25.6 1,204 41.1 1,381 18.7 4.9 19.7 5.3 21.2 4.2 7.9
50,000 - 99,999 lbs 1,086 25.3 328 9.1 215 7.3 612 35.6 7.1 25.5 3.1 23.3 2.6 34.9
More than 100,000 lbs 1,095 25.6 2,317 64.4 1,480 50.6 611 27.5 4.2 29.9 6.8 22.4 4.4 8.6

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 S S S S S S 3,225 S S S S S S 26.9
Less than 50 lbs S S S S S S S S S S S S S S
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 S S 4 0.3 6 0.4 S S S 24.3 6 9.1 18.5 S
10,000 - 49,999 lbs S S S S S S 2,862 S S S S S S 31
50,000 - 99,999 lbs - - - - - - - - - - - - - -
More than 100,000 lbs S S S S S S 1,009 S S S S S S 43

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 1,076 S S S S S S 25.6
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 1,472 S S S S S S 15
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 22 100 S S S S S 0.5 - S S S S S
Less than 50 lbs - - - - - - - - - - - - - -
50 - 99 lbs S S S S S S S S S S S S S S
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 - - - - - - - - - - - - - -
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 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 5,950 100 7,015 100 854 100 S 27.7 - 26 - 22.3 - S
Less than 50 lbs 388 6.5 12 0.2 1 0.1 S 21.8 1.1 24.1 0.1 36.4 0.1 S
50 - 99 lbs 63 1.1 9 0.1 S S 45 40.9 0.4 32.4 0.1 S S 19.8
100 - 499 lbs 203 3.4 40 0.6 1 0.1 26 26.3 0.9 28.9 0.4 31.6 0.1 36.7
500 - 749 lbs 53 0.9 23 0.3 S S 78 47.9 0.5 36 0.3 S S 27.5
750 - 999 lbs S S S S S S S S S S S S S S
1,000 - 9,999 lbs 1,761 29.6 367 5.2 140 16.3 489 18.6 7.8 14.2 3 27.4 5.9 21.4
10,000 - 49,999 lbs 3,008 50.5 3,556 50.7 481 56.3 176 44.5 7.5 30.1 7.5 30.6 8.5 26.7
50,000 - 99,999 lbs 353 5.9 1,119 16 64 7.5 57 41.2 2.1 36 4.9 35.6 2.8 15.4
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.