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

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 182,785 100 268,926 100 58,222 100 396 9.1 - 9.8 - 11.2 - 11.5
Less than 50 lbs 9,925 5.4 268 0.1 120 0.2 527 13.6 0.9 14.7 - 20.7 - 10.3
50 - 99 lbs 3,877 2.1 194 0.1 53 0.1 273 20.5 0.4 15.3 - 20.5 - 10.1
100 - 499 lbs 14,630 8 1,306 0.5 266 0.5 209 34.9 2.3 11.2 0.1 12.8 0.1 9.5
500 - 749 lbs 3,485 1.9 704 0.3 125 0.2 173 4.7 0.2 9.4 - 5.5 - 14.2
750 - 999 lbs 2,372 1.3 575 0.2 117 0.2 202 7.6 0.2 7.6 - 13 - 11.2
1,000 - 9,999 lbs 45,831 25.1 10,636 4 2,596 4.5 231 23.5 3.6 10.3 0.7 10 0.5 5.2
10,000 - 49,999 lbs 71,970 39.4 93,893 34.9 22,681 39 242 7.1 2 8.2 2.2 6.7 1.8 7.3
50,000 - 99,999 lbs 13,392 7.3 102,107 38 6,198 10.6 59 15.9 1 17.4 3 19.8 2.2 10.3
More than 100,000 lbs 17,304 9.5 59,243 22 26,067 44.8 623 15.6 1.1 18.5 3.1 19.5 2.7 8.4

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 152,202 100 257,077 100 51,295 100 168 8.8 - 10.2 - 9.8 - 4.8
Less than 50 lbs 2,54 6 1.7 91 - 12 - 143 15.9 0.4 8.9 - 17.7 - 16.3
50 - 99 lbs 1,441 0.9 103 - 15 - 142 9.6 0.1 10.3 - 16.5 - 14.6
100 - 499 lbs 6,354 4.2 1,015 0.4 165 0.3 163 6.7 0.5 9.1 0.1 6 - 11.8
500 - 749 lbs 3,093 2 628 0.2 113 0.2 178 5.8 0.2 7.2 - 6.7 - 11.8
750 - 999 lbs 2,275 1.5 568 0.2 113 0.2 196 7.5 0.2 7.8 - 13 - 10.9
1,000 - 9,999 lbs 38,551 25.3 10,029 3.9 2,135 4.2 209 20.4 2.8 9.2 0.6 5.6 0.3 6.5
10,000 - 49,999 lbs 70,251 46.2 92,152 35.8 21,650 42.2 235 7.4 1.5 8.3 2.3 7.1 1.8 7
50,000 - 99,999 lbs 13,257 8.7 100,785 39.2 5,887 11.5 57 15.9 1.3 17.2 2.9 20.5 2.2 7.3
More than 100,000 lbs 14,434 9.5 51,706 20.1 21,203 41.3 582 14 0.9 19.5 2.9 16.2 2.3 7.8

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 138,230 100 216,993 100 30,088 100 155 9 - 10.8 - 6 - 5.3
Less than 50 lbs 2,210 1.6 89 - 10 - 116 16.9 0.4 8.9 - 18 - 18.6
50 - 99 lbs 1,402 1 102 - 15 - 138 10 0.2 10.5 - 17.7 - 15.4
100 - 499 lbs 6,266 4.5 1,013 0.5 163 0.5 161 6.7 0.5 9.1 0.1 6.2 0.1 12
500 - 749 lbs 3,034 2.2 627 0.3 113 0.4 178 6.1 0.3 7.3 - 6.9 - 11.8
750 - 999 lbs 2,173 1.6 561 0.3 102 0.3 181 8 0.2 7.8 - 13.7 0.1 11.8
1,000 - 9,999 lbs 38,330 27.7 10,018 4.6 2,128 7.1 209 20.6 3 9.3 0.7 5.6 0.4 6.5
10,000 - 49,999 lbs 70,043 50.7 91,806 42.3 21,156 70.3 231 7.4 1.7 8.4 2.8 7.3 2.9 6.7
50,000 - 99,999 lbs 13,018 9.4 100,110 46.1 5,451 18.1 55 16.5 1.4 17.4 3.1 22.3 3.1 6.8
More than 100,000 lbs S S S S 950 3.2 S S S S S 33.2 1.1 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 84,748 100 109,346 100 22,018 100 417 11.9 - 14.5 - 6.4 - 6.4
Less than 50 lbs 390 0.5 11 - 6 - 575 25.9 0.2 32.3 - 28.9 - 6.2
50 - 99 lbs 432 0.5 16 - 9 - 562 17.8 0.1 20.8 - 24.7 - 14.6
100 - 499 lbs 2,696 3.2 184 0.2 110 0.5 595 11.9 0.6 13.6 0.1 9.1 0.1 9.2
500 - 749 lbs 1,426 1.7 113 0.1 71 0.3 623 18 0.4 11.3 - 9.8 - 4.9
750 - 999 lbs 869 1 132 0.1 60 0.3 457 23.3 0.4 36 0.1 15.2 - 15.3
1,000 - 9,999 lbs 25,158 29.7 3,592 3.3 1,467 6.7 447 29.9 4.4 19.4 0.8 7.4 0.4 12.7
10,000 - 49,999 lbs 45,759 54 43,122 39.4 16,391 74.4 396 7.8 3.1 9.8 4.8 8.1 2.7 5.9
50,000 - 99,999 lbs 6,525 7.7 51,815 47.4 3,126 14.2 61 21.9 2.1 22.2 4.5 19.3 2.8 8.9
More than 100,000 lbs S S S S 777 3.5 S S S S S 39.5 1.3 S

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 53,483 100 107,646 100 8,070 100 71 6.9 - 15.3 - 12.1 - 6.5
Less than 50 lbs 1,820 3.4 78 0.1 5 0.1 57 16.1 0.8 7.3 - 15.4 - 20.2
50 - 99 lbs 970 1.8 86 0.1 5 0.1 61 11.3 0.3 10.6 - 13 - 23.1
100 - 499 lbs 3,570 6.7 830 0.8 53 0.7 65 9.3 0.7 12.7 0.2 11.5 0.1 16.4
500 - 749 lbs 1,607 3 515 0.5 42 0.5 80 9 0.4 10.4 0.1 11.6 0.1 10
750 - 999 lbs 1,304 2.4 429 0.4 42 0.5 98 9.4 0.3 8.1 0.1 22.3 0.2 19.3
1,000 - 9,999 lbs 13,172 24.6 6,426 6 661 8.2 103 6.9 1.4 7.7 1.1 10.4 1 7
10,000 - 49,999 lbs 24,284 45.4 48,684 45.2 4,765 59 98 10.8 2.3 11.5 3.7 8.3 3.8 7.1
50,000 - 99,999 lbs 6,493 12.1 48,295 44.9 2,325 28.8 48 18.2 1.7 23.7 5.2 30.9 4.3 15.8
More than 100,000 lbs 262 0.5 2,305 2.1 173 2.1 77 27.9 0.2 28.4 0.9 22.8 0.5 32.8

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 12,388 100 37,916 100 20,504 100 700 14.2 - 11.3 - 15.3 - 12.3
Less than 50 lbs S S S S S S 658 S S S S S S 21.8
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 1 - - - S S 135 34.2 - 44.2 - S S 46.5
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 436 S S S S S S 37.3
10,000 - 49,999 lbs S S 337 0.9 S S 1,274 S S 46.5 0.3 S S 23.3
50,000 - 99,999 lbs S S 667 1.8 S S 518 S S 41.1 0.9 S S 26
More than 100,000 lbs 11,852 95.7 36,902 97.3 19,578 95.5 691 15.4 2.4 11.6 1.1 15.6 2.2 7.4

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 710 100 S S S S 476 49.2 - S S S S 46.4
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 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 708 99.7 S S S S 573 49.4 0.7 S S S S 36.7

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 821 S S S S S S 21.8
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 821 S S S S S S 21.8

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 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 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

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 849 100 22 100 32 100 863 30.9 - 24.6 - 33.5 - 15.9
Less than 50 lbs 336 39.6 2 9.3 2 5.4 836 44.3 7.4 30 4 28 5 7.5
50 - 99 lbs 39 4.5 1 3.3 1 1.6 721 33.1 2.5 40.1 1.9 32.5 2.3 20.7
100 - 499 lbs S S S S 2 7.7 1,187 S S S S 42.2 12.8 16.2
500 - 749 lbs S S 1 2.6 - 0.7 S S S 41.2 11.7 40.8 3.2 S
750 - 999 lbs 99 11.6 S S S S 1,727 29.5 15 S S S S 18.7
1,000 - 9,999 lbs 113 13.4 2 8.7 3 8.3 1,258 39 12.2 36.2 9.8 43.5 12.1 26.6
10,000 - 49,999 lbs S S S S S S 1,852 S S S S S S 38.7
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 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 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 27,897 100 7,465 100 6,381 100 650 23.9 - 18.1 - 27.6 - 7.4
Less than 50 lbs 7,095 25.4 171 2.3 107 1.7 685 15.7 6.1 19.5 0.5 22.3 0.7 6.9
50 - 99 lbs 2,358 8.5 85 1.1 37 0.6 449 34.6 1.5 32.2 0.3 23.6 0.3 13
100 - 499 lbs S S S S 99 1.6 356 S S S S 32.2 1.6 20.5
500 - 749 lbs 241 0.9 16 0.2 11 0.2 694 22.9 0.4 26.6 0.1 24.3 0.1 14.3
750 - 999 lbs S S 3 - 2 - 742 S S 23.9 - 31.4 - 16.4
1,000 - 9,999 lbs S S 450 6 S S 889 S S 49.9 3.9 S S 29.2
10,000 - 49,999 lbs 1,014 3.6 508 6.8 714 11.2 1,516 29.7 2.8 26.9 3.4 26.5 4.1 14.6
50,000 - 99,999 lbs 88 0.3 S S 270 4.2 S 37.5 0.2 S S 40.8 3.3 S
More than 100,000 lbs 2,605 9.3 5,271 70.6 4,736 74.2 1,053 28.8 2.8 27.7 8 36.5 6.6 11.4

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 17,856 100 536 100 256 100 648 38.6 - 33.5 - 21.1 - 7.6
Less than 50 lbs 7,094 39.7 171 31.9 107 41.9 685 15.7 7.8 19.5 5.4 22.4 4.6 6.9
50 - 99 lbs 2,358 13.2 85 15.8 37 14.6 449 34.6 2.5 32.2 2.2 23.6 2 13
100 - 499 lbs S S S S 98 38.4 354 S S S S 32.7 5.1 20.1
500 - 749 lbs 240 1.3 16 3 11 4.2 684 23.1 0.5 27.3 1.2 27.5 0.9 14.1
750 - 999 lbs S S 3 0.6 2 1 785 S S 22.4 0.4 29.3 0.5 13.3
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 - - - - - - - - - - - - - -

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 8,143 100 4,274 100 3,998 100 893 41.2 - 15.5 - 25.5 - 13.3
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 1 - S S 1,043 S S 39.5 0.1 S S 49.3
500 - 749 lbs S S S S S S 1,316 S S S S S S 19.6
750 - 999 lbs S S S S S S 82 S S S S S S 30.4
1,000 - 9,999 lbs S S S S S S 885 S S S S S S 31.7
10,000 - 49,999 lbs 307 3.8 274 6.4 405 10.1 1,548 24.7 6.1 31.5 3.9 31.3 5.3 17.1
50,000 - 99,999 lbs S S S S 106 2.7 S S S S S 45 7.4 S
More than 100,000 lbs 1,470 18.1 2,950 69 3,087 77.2 1,058 25.3 14.4 21.6 7.9 29.9 6.4 12.2

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 1,286 100 S S 1,439 100 1,584 39.6 - S S 48.7 - 40.9
Less than 50 lbs - - - - - - - - - - - - - -
50 - 99 lbs - - - - - - - - - - - - - -
100 - 499 lbs 1 0.1 S S S S 1,892 49.8 0.1 S S S S 15.5
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 690 53.7 S S S S 1,489 32.7 13.6 S S S S 8.6
50,000 - 99,999 lbs 17 1.4 S S S S 1,823 27.2 16.5 S S S S 23.3
More than 100,000 lbs S S S S S S 1,034 S S S S S S 2.8

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 35 100 S S 85 100 S 26.8 - S S 38.6 - 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 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

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 577 100 S S S S 437 48.3 - S S S S 45.4
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 564 97.9 S S 602 99.8 S 37.5 1.2 S S 40.9 0.1 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 2,687 100 4,384 100 547 100 76 12.4 - 22.5 - 23.5 - 33.1
Less than 50 lbs 283 10.5 7 0.2 - 0.1 59 32.3 2.4 19.8 - 31.3 0.1 25.3
50 - 99 lbs 78 2.9 7 0.2 - 0.1 57 38 0.7 39 - 44.3 - 34.8
100 - 499 lbs 195 7.3 28 0.6 2 0.3 75 31.9 2 30.5 0.2 30 0.2 45.7
500 - 749 lbs S S S S - 0.1 S S S S S 35.1 - S
750 - 999 lbs S S 3 0.1 S S S S S 46.6 0.1 S S S
1,000 - 9,999 lbs 954 35.5 157 3.6 57 10.5 342 32.2 7.9 20 4.1 26.2 5.3 25.2
10,000 - 49,999 lbs 705 26.2 1,233 28.1 316 57.8 248 24 8 36.2 9.9 34.2 8.1 34.1
50,000 - 99,999 lbs S S 624 14.2 S S 69 S S 39.4 7.7 S S 29.2
More than 100,000 lbs 265 9.9 2,266 51.7 128 23.4 S 33.4 6.8 43.6 17.3 45.3 14.8 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.