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 377,718 100 372,777 100 70,173 100 448 4.9 - 11.1 - 4.4 - 8.5
Less than 50 lbs 32,967 8.7 902 0.2 407 0.6 543 4.9 0.5 9.7 - 12.3 0.1 9.2
50 - 99 lbs 11,907 3.2 695 0.2 269 0.4 383 11.2 0.3 11.4 - 14.6 0.1 9.9
100 - 499 lbs 40,647 10.8 3,728 1 986 1.4 270 15.1 1.2 8.7 0.2 9.4 0.1 5.4
500 - 749 lbs 11,341 3 1,866 0.5 400 0.6 217 22.9 0.5 12.3 0.1 14 0.1 7.2
750 - 999 lbs 6,012 1.6 1,427 0.4 336 0.5 232 6.7 0.1 9.4 - 8.9 - 8.6
1,000 - 9,999 lbs 76,881 20.4 25,183 6.8 5,703 8.1 224 5.5 1.4 7 0.9 6.7 0.6 7.8
10,000 - 49,999 lbs 158,303 41.9 234,302 62.9 42,654 60.8 190 3.9 1.4 11.1 1.9 6.3 1.9 8.7
50,000 - 99,999 lbs 30,211 8 72,091 19.3 5,876 8.4 79 32.6 2 25.5 2.5 9.3 0.8 22.6
More than 100,000 lbs 9,448 2.5 32,583 8.7 13,543 19.3 477 13.9 0.4 16.6 1.9 12.1 2.3 10.3

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 331,477 100 360,975 100 64,624 100 231 5.2 - 11.2 - 4.5 - 11.9
Less than 50 lbs 10,494 3.2 319 0.1 79 0.1 248 12.2 0.3 16.1 - 25.4 - 20.5
50 - 99 lbs 6,319 1.9 338 0.1 80 0.1 236 17.1 0.3 9.1 - 13.3 - 9.3
100 - 499 lbs 31,260 9.4 3,030 0.8 696 1.1 233 18.2 1.2 8.8 0.1 8.4 0.1 5.9
500 - 749 lbs 10,602 3.2 1,751 0.5 373 0.6 215 23.8 0.6 13 0.1 14.9 0.1 8
750 - 999 lbs 5,727 1.7 1,335 0.4 327 0.5 242 6.9 0.1 9.5 - 8.9 - 8.3
1,000 - 9,999 lbs 74,874 22.6 24,461 6.8 5,565 8.6 225 5.6 1.6 7.4 0.9 7 0.6 7.9
10,000 - 49,999 lbs 154,659 46.7 230,510 63.9 41,131 63.6 187 4.1 1.7 10.9 2 6.4 1.8 8.9
50,000 - 99,999 lbs 30,053 9.1 71,692 19.9 5,600 8.7 76 32.8 2.4 25.7 2.5 8 0.7 22.4
More than 100,000 lbs 7,490 2.3 27,539 7.6 10,773 16.7 451 16.3 0.4 19.2 1.8 11.9 2.1 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 317,143 100 337,979 100 54,402 100 209 5.7 - 11.8 - 5.6 - 10.8
Less than 50 lbs 8,567 2.7 299 0.1 60 0.1 202 14 0.4 17.5 - 27.5 - 18.2
50 - 99 lbs 5,488 1.7 334 0.1 75 0.1 222 16.1 0.2 9.2 - 13.1 - 7.5
100 - 499 lbs 30,332 9.6 3,019 0.9 687 1.3 230 19 1.2 8.8 0.2 8.4 0.1 6
500 - 749 lbs 10,544 3.3 1,750 0.5 371 0.7 214 24 0.6 13.1 0.1 15.1 0.1 8.1
750 - 999 lbs 5,681 1.8 1,330 0.4 324 0.6 241 6.8 0.1 9.5 - 8.9 - 8.4
1,000 - 9,999 lbs 74,186 23.4 24,378 7.2 5,545 10.2 225 5.7 1.6 7.3 1 7 0.8 7.9
10,000 - 49,999 lbs 153,621 48.4 229,496 67.9 40,768 74.9 186 4.3 2 10.8 1.8 6.5 1.2 8.9
50,000 - 99,999 lbs 25,508 8 70,139 20.8 4,873 9 71 38.9 2.4 25.7 2.6 11.1 0.9 23.3
More than 100,000 lbs 3,216 1 7,235 2.1 1,698 3.1 295 30.1 0.3 17.5 0.5 24 0.7 15.3

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 190,646 100 152,060 100 40,064 100 489 7 - 13.4 - 6 - 6.8
Less than 50 lbs 3,656 1.9 97 0.1 47 0.1 571 20.8 0.3 30.5 - 32.4 - 13
50 - 99 lbs 3,234 1.7 128 0.1 60 0.2 475 25.9 0.3 18.4 - 15 - 7.9
100 - 499 lbs 19,894 10.4 1,121 0.7 563 1.4 483 27.3 1.6 14.8 0.1 9.6 0.1 7.6
500 - 749 lbs 6,668 3.5 559 0.4 294 0.7 521 35.6 0.8 19.1 0.1 18.5 0.1 6.5
750 - 999 lbs 2,906 1.5 398 0.3 258 0.6 644 11.1 0.2 11.7 - 11.9 0.1 4.2
1,000 - 9,999 lbs 42,232 22.2 8,059 5.3 3,783 9.4 497 7.5 1.8 8.2 0.8 8.3 0.7 5.1
10,000 - 49,999 lbs 96,934 50.8 95,963 63.1 30,119 75.2 336 5.8 2.2 9.8 2.7 6 1.2 8.2
50,000 - 99,999 lbs 12,809 6.7 40,600 26.7 3,354 8.4 83 25.2 1.9 32.5 3.6 15.2 1.2 20.9
More than 100,000 lbs 2,312 1.2 5,136 3.4 1,586 4 491 39.2 0.6 24.9 0.8 26.1 0.9 15.3

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 126,498 100 185,918 100 14,338 100 64 9.4 - 18.9 - 17.2 - 11.6
Less than 50 lbs 4,911 3.9 202 0.1 13 0.1 48 18.2 0.7 17.4 - 21.2 - 26.6
50 - 99 lbs 2,253 1.8 206 0.1 15 0.1 71 15.4 0.3 9.6 - 18.1 - 14.2
100 - 499 lbs 10,439 8.3 1,898 1 124 0.9 67 8.6 1 8.5 0.3 9.2 0.1 9.1
500 - 749 lbs 3,876 3.1 1,191 0.6 77 0.5 65 7.3 0.3 15 0.1 7.2 0.1 11.7
750 - 999 lbs 2,775 2.2 932 0.5 66 0.5 70 9.1 0.2 11.4 0.1 11.2 0.1 14.5
1,000 - 9,999 lbs 31,954 25.3 16,319 8.8 1,763 12.3 102 6.4 2.2 10.2 1.7 11.1 2 9.6
10,000 - 49,999 lbs 56,687 44.8 133,533 71.8 10,649 74.3 82 6.9 2.2 17.8 3.2 20.4 2.4 14
50,000 - 99,999 lbs S S 29,539 15.9 1,519 10.6 53 S S 47.8 2.9 25.7 1.8 33.9
More than 100,000 lbs 904 0.7 2,099 1.1 112 0.8 48 28 0.2 18 0.3 45.3 0.2 31.2

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 5,066 100 21,288 100 10,145 100 497 12.6 - 20.4 - 14 - 13.8
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 8 0.2 1 - - - 362 32.1 0.2 13.6 - 32 - 37.5
500 - 749 lbs 2 - - - S S 554 25.1 0.1 41.6 - S S 46.8
750 - 999 lbs 2 - - - S S 550 41.9 0.3 43.9 - S S 25.6
1,000 - 9,999 lbs 87 1.7 S S 8 0.1 S 32.9 0.9 S S 30.5 - S
10,000 - 49,999 lbs 574 11.3 415 1.9 358 3.5 797 19.9 3 20.7 0.7 34.7 1.4 21.6
50,000 - 99,999 lbs 285 5.6 885 4.2 714 7 790 18.1 1.4 30.8 2.8 43.2 3 15.4
More than 100,000 lbs 4,107 81.1 19,928 93.6 9,065 89.4 483 15.5 4.2 22.3 3.4 15.7 3.7 13.8

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 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

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 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

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 - - - - - - - - - - - - - -
More than 100,000 lbs - - - - - - - - - - - - - -

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 8,303 100 83 100 67 100 1,037 27.6 - 22.1 - 24.1 - 10.2
Less than 50 lbs 1,926 23.2 S S S S 1,038 31.6 8.1 S S S S 12.5
50 - 99 lbs 831 10 4 5.3 S S 1,238 35.8 7.7 48 3.2 S S 10
100 - 499 lbs 920 11.1 10 12.1 8 12 801 28.4 6.5 34.8 6.3 23 5.1 48.4
500 - 749 lbs S S S S S S 1,528 S S S S S S 20.7
750 - 999 lbs 44 0.5 S S 3 4.4 S 27.8 8.3 S S 40.7 17.8 S
1,000 - 9,999 lbs S S 18 21.9 11 16.6 S S S 47.9 7.2 31.2 7.4 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 1,175 S S S S S S 35.1
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 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 39,711 100 6,351 100 4,541 100 703 7.1 - 14.5 - 12.5 - 5.5
Less than 50 lbs 21,692 54.6 532 8.4 325 7.2 724 6.1 3.9 9.1 2.9 9.7 2.2 5.7
50 - 99 lbs 5,038 12.7 313 4.9 178 3.9 554 11.7 0.8 16.8 1.2 18 1.1 10
100 - 499 lbs 8,891 22.4 494 7.8 263 5.8 504 21.5 3.2 15.5 2.1 17.2 1.5 6.8
500 - 749 lbs 458 1.2 47 0.7 24 0.5 513 29.1 0.4 21.9 0.4 26.2 0.3 15.5
750 - 999 lbs 117 0.3 S S S S S 38.5 0.1 S S S S S
1,000 - 9,999 lbs S S 79 1.2 45 1 S S S 44.8 0.5 34.6 0.2 S
10,000 - 49,999 lbs 1,615 4.1 731 11.5 834 18.4 967 18.7 0.6 25.2 2.4 17.1 4.3 22.8
50,000 - 99,999 lbs 99 0.2 S S S S 902 31.6 0.1 S S S S 17.5
More than 100,000 lbs 1,404 3.5 3,853 60.7 2,603 57.3 678 30.2 1.2 21.9 7.1 20.3 7.4 10

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 36,086 100 1,391 100 796 100 703 6.9 - 9.7 - 9.8 - 5.5
Less than 50 lbs 21,688 60.1 532 38.2 325 40.8 724 6.1 4.2 9.1 3.2 9.7 4.3 5.8
50 - 99 lbs 5,027 13.9 312 22.5 178 22.4 555 11.6 1.1 16.8 1.6 18 2.1 10
100 - 499 lbs 8,866 24.6 487 35 261 32.8 507 21.5 3.5 16 3.5 17.4 3.4 6.9
500 - 749 lbs 398 1.1 45 3.2 24 3 528 35.2 0.4 23.4 0.8 26.4 0.8 14.2
750 - 999 lbs 108 0.3 S S S S S 41.7 0.2 S S 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 2,558 100 4,681 100 3,408 100 498 21.6 - 20.7 - 18.6 - 32.7
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 1 - S S S S S 31.2 0.1 S
500 - 749 lbs S S S S - - S S S S S 37.7 - S
750 - 999 lbs S S S S S S S S S S S S S S
1,000 - 9,999 lbs 164 6.4 69 1.5 26 0.8 S 47.2 5.2 48.3 0.9 44.7 0.5 S
10,000 - 49,999 lbs 957 37.4 607 13 670 19.7 892 20.2 6.5 31.4 4.3 19.6 7.8 29.7
50,000 - 99,999 lbs 63 2.5 S S S S 884 45.6 4.7 S S S S 23.1
More than 100,000 lbs 1,320 51.6 3,737 79.8 2,476 72.7 677 32.9 7.5 23.3 5 22.4 7.3 9.9

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 970 100 260 100 S S 1,847 28 - 45.3 - S S 16.7
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 S S - - - - 1,469 S S 38.1 0.2 45.8 0.2 18.5
750 - 999 lbs - - - - - - - - - - - - - -
1,000 - 9,999 lbs S S 10 3.7 S S S S S 40.5 4.2 S S S
10,000 - 49,999 lbs 561 57.9 105 40.4 134 43.6 1,455 36.7 10.5 31.2 13 33.4 13.1 28.7
50,000 - 99,999 lbs S S 29 11.1 29 9.4 1,007 S S 26.4 12.7 45 7.9 31.5
More than 100,000 lbs S S S S S S 921 S S S S S S 41.3

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 91 100 17 100 S S 1,042 20.5 - 35.5 - S S 38.2
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 91 100 17 100 S S 1,042 20.5 - 35.5 - S S 38.2
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 - - - - - - - - - - - - - -

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 6,530 100 5,451 100 1,008 100 S 8 - 30.8 - 31 - S
Less than 50 lbs 782 12 50 0.9 S S S 41.6 4.2 35.6 0.8 S S S
50 - 99 lbs 551 8.4 43 0.8 S S S 48.8 3.6 25.4 0.5 S S S
100 - 499 lbs 496 7.6 205 3.8 S S 116 25.6 2.2 33.3 2.7 S S 28.4
500 - 749 lbs 281 4.3 68 1.2 3 0.3 S 40.3 1.9 31 1 49.2 0.1 S
750 - 999 lbs 168 2.6 76 1.4 1 0.1 S 39.7 0.9 44.3 1.3 29.4 0.1 S
1,000 - 9,999 lbs 1,610 24.7 643 11.8 93 9.2 S 21.5 5.7 20.3 5.1 13.5 4.3 S
10,000 - 49,999 lbs 2,029 31.1 S S 689 68.3 217 18.6 6.3 S S 35.9 8.9 34.5
50,000 - 99,999 lbs 60 0.9 113 2.1 14 1.4 127 43 0.7 26.9 1.6 38.5 1 23.5
More than 100,000 lbs S S S S S S 280 S S S S S S 47.6

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.