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.

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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 489,415 100 500,393 100 88,690 100 639 6.5 - 9.4 - 6 - 11.3
Less than 50 lbs 61,007 12.5 1,164 0.2 670 0.8 773 11.3 1.7 8.1 - 18.9 0.2 10.1
50 - 99 lbs 15,583 3.2 724 0.1 225 0.3 306 6.1 0.2 8.6 - 9.8 - 9.6
100 - 499 lbs 40,823 8.3 3,819 0.8 921 1 251 5.9 0.4 6.9 0.1 7.4 0.1 5.4
500 - 749 lbs 12,378 2.5 2,169 0.4 449 0.5 208 9.2 0.2 6.2 - 13.2 0.1 10.1
750 - 999 lbs 11,898 2.4 2,076 0.4 389 0.4 186 20.2 0.5 6 - 12.5 0.1 9.1
1,000 - 9,999 lbs 101,146 20.7 31,181 6.2 6,827 7.7 199 6.7 1.5 5 0.6 7.3 0.8 4.5
10,000 - 49,999 lbs 196,344 40.1 312,870 62.5 46,057 51.9 173 13.7 2.8 11 2.4 11.5 4.2 8.3
50,000 - 99,999 lbs 27,464 5.6 62,759 12.5 4,531 5.1 68 22 1.1 25.3 2 13.7 0.7 12.9
More than 100,000 lbs 22,772 4.7 83,630 16.7 28,620 32.3 314 14 0.5 12.8 2.4 19.2 4.9 17

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 405,226 100 483,263 100 77,177 100 186 8 - 9.7 - 6.7 - 7.1
Less than 50 lbs 11,075 2.7 397 0.1 63 0.1 211 7.1 0.2 13.8 - 15.1 - 12.8
50 - 99 lbs 7,952 2 455 0.1 64 0.1 135 11 0.2 14.6 - 15.8 - 15.3
100 - 499 lbs 28,848 7.1 3,259 0.7 603 0.8 178 6.1 0.3 7.4 0.1 9.2 0.1 7.4
500 - 749 lbs 10,857 2.7 2,067 0.4 399 0.5 192 8.4 0.2 6.6 0.1 12.7 0.1 9.4
750 - 999 lbs 11,038 2.7 2,019 0.4 358 0.5 176 22.1 0.6 6.2 0.1 11.6 0.1 6.3
1,000 - 9,999 lbs 97,545 24.1 30,550 6.3 6,491 8.4 194 6.6 1.8 5.2 0.7 7.4 1 4.3
10,000 - 49,999 lbs 191,546 47.3 309,765 64.1 43,366 56.2 163 13.7 2.6 11 2.7 11.4 4.6 9.1
50,000 - 99,999 lbs 27,300 6.7 62,403 12.9 4,405 5.7 67 22.2 1.4 25.5 2 14.4 0.7 12.9
More than 100,000 lbs 19,066 4.7 72,349 15 21,429 27.8 293 14.5 0.6 15.6 2.6 24.8 5.1 18.8

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 374,836 100 410,469 100 54,596 100 165 7.1 - 10.7 - 7.7 - 6.6
Less than 50 lbs 8,982 2.4 386 0.1 50 0.1 163 7.9 0.2 13.9 - 13.7 - 12.9
50 - 99 lbs 7,474 2 452 0.1 60 0.1 126 11.8 0.2 14.7 - 17.2 - 16.8
100 - 499 lbs 28,266 7.5 3,246 0.8 588 1.1 174 6.4 0.2 7.4 0.1 9.6 0.1 7.8
500 - 749 lbs 10,737 2.9 2,060 0.5 396 0.7 191 8.5 0.2 6.6 0.1 12.7 0.1 9.4
750 - 999 lbs 10,854 2.9 2,006 0.5 342 0.6 170 22.5 0.6 6.2 0.1 12.1 0.1 6.5
1,000 - 9,999 lbs 96,663 25.8 30,334 7.4 6,435 11.8 193 6.6 1.5 5.2 0.7 7.5 1 4.3
10,000 - 49,999 lbs 183,936 49.1 307,682 75 41,244 75.5 154 11.2 2.3 10.9 1.8 9.4 2.3 6.6
50,000 - 99,999 lbs 25,114 6.7 57,276 14 3,910 7.2 65 22.1 1.4 24.9 2.1 13.4 0.7 13.2
More than 100,000 lbs 2,809 0.7 7,027 1.7 1,572 2.9 260 15 0.1 17.2 0.4 34.4 1.2 33.4

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 221,090 100 202,960 100 43,133 100 516 10.2 - 12.4 - 7.7 - 8.4
Less than 50 lbs 3,415 1.5 55 - 36 0.1 753 12.6 0.2 12.9 - 16.8 - 12.1
50 - 99 lbs 3,841 1.7 71 - 43 0.1 582 20.1 0.3 11.8 - 20.9 - 11.1
100 - 499 lbs 14,479 6.5 795 0.4 444 1 564 9.8 0.5 11.6 0.1 11.1 0.1 4.2
500 - 749 lbs 5,379 2.4 482 0.2 289 0.7 599 8.1 0.3 11.9 - 13.1 0.1 8.1
750 - 999 lbs 6,950 3.1 443 0.2 255 0.6 573 34 1 10.2 - 11.6 0.1 4.7
1,000 - 9,999 lbs 50,789 23 8,708 4.3 4,658 10.8 551 7.1 1.9 4 0.6 7 1.1 4.3
10,000 - 49,999 lbs 123,739 56 169,152 83.3 33,784 78.3 240 16.5 2.9 14.2 1.9 10.4 3 6.6
50,000 - 99,999 lbs 10,594 4.8 20,987 10.3 2,254 5.2 102 20 1.2 13.4 1.5 10.9 0.6 13.2
More than 100,000 lbs 1,904 0.9 2,267 1.1 1,368 3.2 589 17.9 0.2 18.5 0.4 41.4 1.5 19.1

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 153,746 100 207,509 100 11,463 100 54 8.4 - 15.1 - 14.7 - 4.8
Less than 50 lbs 5,568 3.6 331 0.2 13 0.1 47 12.2 0.4 16.5 - 15.4 - 10.9
50 - 99 lbs 3,633 2.4 381 0.2 17 0.1 44 14.3 0.3 17.3 - 12.2 - 12.3
100 - 499 lbs 13,786 9 2,451 1.2 144 1.3 58 8.9 0.7 8.8 0.1 17.5 0.1 6
500 - 749 lbs 5,358 3.5 1,578 0.8 107 0.9 67 11.8 0.3 7.5 0.1 17.1 0.1 13.9
750 - 999 lbs 3,904 2.5 1,564 0.8 87 0.8 56 7 0.2 7 0.1 18 0.1 10.7
1,000 - 9,999 lbs 45,874 29.8 21,627 10.4 1,776 15.5 72 8.9 1.8 6.2 1.2 20.7 1.4 10
10,000 - 49,999 lbs 60,197 39.2 138,530 66.8 7,460 65.1 59 11.2 1.8 14.1 2.3 11.7 1.7 7.4
50,000 - 99,999 lbs 14,521 9.4 36,289 17.5 1,655 14.4 44 35.6 2.8 37.6 3.1 34.1 2.2 17.3
More than 100,000 lbs 905 0.6 4,760 2.3 204 1.8 51 35.1 0.2 21.9 0.7 21.2 0.3 29.6

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 18,514 100 53,673 100 21,077 100 822 31.7 - 22.5 - 24.6 - 24.7
Less than 50 lbs S S S S S S S S S S S S S S
50 - 99 lbs 1 - S S S S S 10.9 - S S S S S
100 - 499 lbs 14 0.1 3 - S S S 40.2 0.1 49.6 - 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 9 - S S S S S 46.4 0.1 S
10,000 - 49,999 lbs S S S S S S 2,048 S S S S S S 21.4
50,000 - 99,999 lbs 269 1.5 396 0.7 104 0.5 274 44.7 0.9 38 0.5 40.1 0.3 33.2
More than 100,000 lbs 10,870 58.7 52,101 97.1 18,918 89.8 446 12.9 11.7 23.6 2.2 28.9 8 10

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

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 - - - - - - - - - - - - - -
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

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 4,136 100 69 100 107 100 1,194 8.4 - 18.1 - 25.4 - 4.9
Less than 50 lbs 2,092 50.6 11 15.9 13 12.3 1,176 10.5 6.3 20 6.1 22.4 6.4 5.5
50 - 99 lbs 476 11.5 3 5 4 4.1 1,300 37.2 3.6 9.9 1.9 17.4 2.1 13.2
100 - 499 lbs 568 13.7 10 14.1 13 12.3 1,400 20 2.6 17 4 17.8 4.4 11.1
500 - 749 lbs 109 2.6 3 3.8 S S 1,003 31.3 0.9 49.2 1.1 S S 28.5
750 - 999 lbs 172 4.2 9 13.5 S S 1,722 38.8 1.5 40.3 4.9 S S 15.4
1,000 - 9,999 lbs S S 22 31.6 36 33.9 1,495 S S 34 7.5 35.4 7.5 16.2
10,000 - 49,999 lbs 9 0.2 S S S S 1,280 4.1 1.1 S S S S 36.7
50,000 - 99,999 lbs S S S S S S S S S S S S S S
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 6,713 100 16,997 100 S S S 42.4 - 42.7 - S S S
Less than 50 lbs - - - - - - - - - - - - - -
50 - 99 lbs - - - - - - - - - - - - - -
100 - 499 lbs - - - - - - - - - - - - - -
500 - 749 lbs - - - - - - - - - - - - - -
750 - 999 lbs - - - - - - - - - - - - - -
1,000 - 9,999 lbs 66 1 157 0.9 S S S 20.3 0.4 16.4 0.3 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 1,902 28.3 4,726 27.8 S S S 10.4 2 12.6 1.7 S S S
More than 100,000 lbs 4,359 64.9 11,166 65.7 S S S 37.1 10.4 37.1 10.2 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 75,080 100 13,269 100 9,732 100 886 8.5 - 27.7 - 33.4 - 6.4
Less than 50 lbs 48,691 64.9 738 5.6 606 6.2 898 13.9 3.7 14.5 5.3 21.1 4.5 6.7
50 - 99 lbs 7,306 9.7 254 1.9 159 1.6 623 6 1 8.2 1.4 9.5 0.7 6.2
100 - 499 lbs 10,960 14.6 478 3.6 310 3.2 646 9.3 1.5 9.1 2.5 7.3 1.3 4
500 - 749 lbs 1,395 1.9 83 0.6 48 0.5 609 25.3 0.5 21.4 0.7 28 0.4 16.9
750 - 999 lbs S S 21 0.2 S S 1,210 S S 31.2 0.2 S S 29.4
1,000 - 9,999 lbs S S 30 0.2 41 0.4 S S S 25.8 0.1 24.3 0.2 S
10,000 - 49,999 lbs 2,238 3 797 6 1,341 13.8 1,644 41.1 1.4 17.1 4.4 10.8 7.8 9.9
50,000 - 99,999 lbs 98 0.1 135 1 72 0.7 S 24.6 - 36.3 1.6 41.3 0.9 S
More than 100,000 lbs 3,536 4.7 10,733 80.9 7,128 73.2 464 38.8 2.2 34.7 13.6 46 13.6 41.4

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 68,187 100 1,561 100 1,126 100 886 10.6 - 9.4 - 13.4 - 6.5
Less than 50 lbs 48,683 71.4 738 47.3 606 53.8 898 13.9 2.6 14.5 3.7 21.1 5 6.7
50 - 99 lbs 7,306 10.7 254 16.3 159 14.1 623 6 1.1 8.2 1.1 9.5 1.6 6.3
100 - 499 lbs 10,767 15.8 476 30.5 308 27.4 645 9.7 1.6 9.1 2.9 7.3 3.5 4
500 - 749 lbs 1,276 1.9 78 5 45 4 610 26.5 0.5 23.3 1.1 25.6 0.8 15.4
750 - 999 lbs S S 15 1 8 0.7 S S S 36.8 0.5 34.6 0.4 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 - - - - - - - - - - - - - -
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 3,238 100 S S 3,873 100 962 32 - S S 44 - 21
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 798 S S S S S S 32.1
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 77 2.4 19 0.3 17 0.4 S 48.2 0.6 36.9 0.3 50 0.4 S
10,000 - 49,999 lbs 1,971 60.9 658 11.6 1,132 29.2 1,652 47.4 7.4 17.6 10.6 11.4 12.3 11.6
50,000 - 99,999 lbs 77 2.4 107 1.9 S S 464 27.5 2.2 34.7 2.7 S S 28.6
More than 100,000 lbs 903 27.9 S S S S 558 30.2 8.2 S S S S 27.8

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 2,647 S S S S S S 25.2
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 34.8 1.7 S S S
500 - 749 lbs S S S S S S 1,621 S S S S S S 40.5
750 - 999 lbs S S S S S S 8,016 S S S S S S 15.7
1,000 - 9,999 lbs S S 11 0.4 23 0.6 S S S 46.6 2.9 32.9 6.1 S
10,000 - 49,999 lbs 257 11.2 S S S S 1,387 37.5 16.6 S S S S 27
50,000 - 99,999 lbs 20 0.9 S S S S S 12 9.1 S S S S S
More than 100,000 lbs S S S S S S 1,529 S S S S S S 15.5

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 5,838 S S S S S S 0.8
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 - - - - - - - - - - - - - -
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 - - - - - - - - - - - - - -

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 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 - - - - - - - - - - - - - -
More than 100,000 lbs S S S S S S 254 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 9,109 100 3,860 100 1,781 100 173 13.7 - 19.4 - 46.6 - 29.2
Less than 50 lbs 1,241 13.6 29 0.8 2 0.1 162 33.1 3.5 46.7 0.3 36.2 0.1 36.3
50 - 99 lbs 324 3.6 15 0.4 1 0.1 60 39.2 1.2 18.8 0.2 33.8 0.1 32.6
100 - 499 lbs 1,014 11.1 83 2.1 8 0.5 96 32.5 1.9 16.6 0.4 39.6 0.4 38
500 - 749 lbs 125 1.4 20 0.5 2 0.1 S 25.8 0.6 40.1 0.2 20.5 0.2 S
750 - 999 lbs 610 6.7 36 0.9 S S S 48.6 2.9 30.2 0.3 S S S
1,000 - 9,999 lbs 2,997 32.9 601 15.6 296 16.6 443 18.9 4.2 23.7 3.7 28.6 5.9 15
10,000 - 49,999 lbs 2,560 28.1 2,309 59.8 S S 657 20.7 5.3 33.4 8.9 S S 15.3
50,000 - 99,999 lbs 67 0.7 221 5.7 S S 259 36.8 0.5 32.8 2.7 S S 38.1
More than 100,000 lbs S S 548 14.2 S S S S S 39.4 7.8 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.