USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

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 225,954 100 305,184 100 77,099 100 494 6.4 - 5.5 - 12.2 - 6
Less than 50 lbs 27,157 12 504 0.2 307 0.4 641 9.3 1.3 10.3 - 14.8 0.1 5.6
50 - 99 lbs 7,076 3.1 406 0.1 199 0.3 480 8.4 0.2 8.2 - 13.2 - 7.2
100 - 499 lbs 22,408 9.9 2,205 0.7 542 0.7 261 10.4 0.9 9.2 0.1 7.3 0.1 11.4
500 - 749 lbs 7,130 3.2 1,173 0.4 249 0.3 213 22.7 0.7 13.5 0.1 17.4 0.1 13.5
750 - 999 lbs 5,443 2.4 1,043 0.3 179 0.2 172 32.1 0.7 12.5 - 13.2 - 7.6
1,000 - 9,999 lbs 52,480 23.2 19,140 6.3 4,359 5.7 205 19.5 2.8 15.7 1.1 22.5 1.9 9.7
10,000 - 49,999 lbs 84,077 37.2 130,493 42.8 24,826 32.2 187 5.4 1.5 7.5 2.7 7.4 2.8 9
50,000 - 99,999 lbs 10,452 4.6 86,069 28.2 7,214 9.4 79 20.7 0.9 8.8 2.2 22.3 1.5 15.3
More than 100,000 lbs 9,730 4.3 64,152 21 39,225 50.9 540 18.6 0.8 13.1 2 18.9 4.3 10.4

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 176,493 100 282,414 100 68,407 100 171 5.6 - 6.3 - 13.9 - 6.6
Less than 50 lbs 9,406 5.3 136 - 25 - 196 23 1.4 8.1 - 19.6 - 9.8
50 - 99 lbs 2,570 1.5 174 0.1 21 - 114 18 0.2 10.8 - 13 - 17.6
100 - 499 lbs 14,743 8.4 1,855 0.7 317 0.5 159 10.3 0.7 10.6 0.1 7.6 0.1 12.1
500 - 749 lbs 5,109 2.9 1,116 0.4 221 0.3 199 12.8 0.4 14.6 0.1 20 0.1 14.9
750 - 999 lbs 5,232 3 1,020 0.4 171 0.3 168 33 1 12.7 0.1 13.6 0.1 7.7
1,000 - 9,999 lbs 40,449 22.9 17,635 6.2 3,110 4.5 169 9.5 1.2 14.5 1 10.4 0.8 10.3
10,000 - 49,999 lbs 80,546 45.6 123,360 43.7 22,961 33.6 184 5.7 1.3 8.2 2.5 7.6 3.1 9.2
50,000 - 99,999 lbs 9,401 5.3 81,906 29 6,767 9.9 77 18.4 0.9 8.7 2.1 24.1 1.8 15.8
More than 100,000 lbs 9,039 5.1 55,211 19.5 34,813 50.9 546 20.4 0.9 15.5 2.2 21.4 4.2 10.7

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 162,243 100 229,610 100 32,641 100 153 5.6 - 6.4 - 7.7 - 7.1
Less than 50 lbs 8,631 5.3 130 0.1 20 0.1 147 25.3 1.4 8.9 - 21.7 - 11.5
50 - 99 lbs 2,448 1.5 172 0.1 19 0.1 107 19.4 0.3 10.7 - 13.9 - 19.2
100 - 499 lbs 14,081 8.7 1,844 0.8 306 0.9 153 10.6 0.8 10.6 0.1 7.9 0.1 11.6
500 - 749 lbs 5,033 3.1 1,115 0.5 220 0.7 198 13 0.4 14.6 0.1 19.9 0.1 14.8
750 - 999 lbs 3,548 2.2 1,016 0.4 165 0.5 163 13.1 0.2 12.7 0.1 14.5 0.1 8.7
1,000 - 9,999 lbs 39,810 24.5 17,583 7.7 3,070 9.4 166 9.9 1.2 14.6 1.2 10.7 1.2 10
10,000 - 49,999 lbs 77,407 47.7 122,628 53.4 22,331 68.4 180 5.5 1.5 8.3 2 7.5 2.6 9
50,000 - 99,999 lbs 8,643 5.3 78,938 34.4 5,124 15.7 66 17.7 0.9 8.3 2.5 19.2 2.1 16
More than 100,000 lbs 2,641 1.6 6,184 2.7 1,386 4.2 186 35.2 0.6 28.7 0.7 41.4 1.2 44.4

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 94,645 100 93,529 100 23,773 100 384 6.1 - 9.7 - 8.8 - 10
Less than 50 lbs 6,213 6.6 31 - 13 0.1 386 35.1 2.1 21.1 - 30.6 - 18.3
50 - 99 lbs 1,197 1.3 32 - 12 - 351 41.1 0.5 23.1 - 24.3 - 21.6
100 - 499 lbs 8,046 8.5 489 0.5 211 0.9 395 20.7 1.5 11.7 0.1 12.7 0.2 14.2
500 - 749 lbs 2,516 2.7 260 0.3 129 0.5 495 16.7 0.4 15.8 0.1 20.7 0.2 9.9
750 - 999 lbs 1,695 1.8 218 0.2 115 0.5 525 16.7 0.2 14.2 0.1 18.7 0.1 7.4
1,000 - 9,999 lbs 18,846 19.9 4,451 4.8 2,191 9.2 493 8.8 1.2 11.4 0.7 13.6 1.4 6.1
10,000 - 49,999 lbs 50,426 53.3 53,696 57.4 16,456 69.2 326 6.4 2.5 11.4 3.4 8.8 3.8 10.7
50,000 - 99,999 lbs 4,181 4.4 31,420 33.6 3,415 14.4 110 18 0.7 15.1 3.9 28.9 2.9 16.7
More than 100,000 lbs 1,527 1.6 2,933 3.1 1,231 5.2 417 40.5 0.5 30 0.8 46 1.5 25.4

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 67,598 100 136,080 100 8,868 100 68 8.1 - 9.1 - 8.8 - 6.9
Less than 50 lbs 2,419 3.6 99 0.1 7 0.1 66 11 0.5 8.3 - 7.2 - 8.6
50 - 99 lbs 1,251 1.9 140 0.1 8 0.1 55 9.2 0.1 13 - 8 - 10.6
100 - 499 lbs 6,035 8.9 1,355 1 95 1.1 67 10.9 0.9 12.2 0.1 10.2 0.2 12.8
500 - 749 lbs 2,517 3.7 855 0.6 91 1 108 16.2 0.5 16.3 0.1 37.8 0.3 30.9
750 - 999 lbs 1,854 2.7 798 0.6 51 0.6 63 14.7 0.3 14.2 0.1 18.8 0.1 11.7
1,000 - 9,999 lbs 20,965 31 13,132 9.7 880 9.9 66 14.2 2.8 17.9 1.4 12.5 1.5 11.1
10,000 - 49,999 lbs 26,981 39.9 68,932 50.7 5,875 66.2 79 7.6 2.1 9.6 2.4 11.3 3.2 13.5
50,000 - 99,999 lbs 4,462 6.6 47,518 34.9 1,708 19.3 37 21.4 1.2 12.8 2.8 12.9 2.2 7.1
More than 100,000 lbs S S 3,251 2.4 155 1.7 36 S S 31.6 0.8 25.9 0.4 42.1

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 7,221 100 21,668 100 13,575 100 670 29.8 - 31.9 - 40.6 - 8.3
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 432 S S S S S S 40.9
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 13 0.1 S S S S S 46.1 0.1 S
10,000 - 49,999 lbs 3,101 42.9 686 3.2 628 4.6 944 33.1 7.4 26.5 1.2 20.8 2.3 12.7
50,000 - 99,999 lbs S S S S S S 614 S S S S S S 39.2
More than 100,000 lbs 3,424 47.4 18,335 84.6 11,301 83.2 663 28.7 7.7 26.4 3.5 36.3 3 8.9

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 2,966 100 30,668 100 22,107 100 602 27.1 - 20.1 - 23.8 - 11.4
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 - - - - - - - - - - - - - -
50,000 - 99,999 lbs - - - - - - - - - - - - - -
More than 100,000 lbs 2,966 100 30,668 100 22,107 100 602 27.1 - 20.1 - 23.8 - 11.4

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 2,966 100 30,668 100 22,107 100 602 27.1 - 20.1 - 23.8 - 11.4
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 - - - - - - - - - - - - - -
50,000 - 99,999 lbs - - - - - - - - - - - - - -
More than 100,000 lbs 2,966 100 30,668 100 22,107 100 602 27.1 - 20.1 - 23.8 - 11.4

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 S S 79 100 72 100 717 S S 35.2 - 29.9 - 21.5
Less than 50 lbs 774 20.6 6 8.2 5 7.4 689 30.8 9.6 22.1 5.8 23.4 5.4 23.5
50 - 99 lbs 122 3.2 2 2.6 S S 757 35.3 1.8 36.1 2.1 S S 10.7
100 - 499 lbs S S 10 12.7 11 15.9 1,109 S S 28.9 6.5 36.9 8.2 18.8
500 - 749 lbs S S S S S S 1,263 S S S S S S 10.8
750 - 999 lbs S S S S S S 1,284 S S S S S S 19.5
1,000 - 9,999 lbs 435 11.6 S S S S 979 48.3 5.1 S S S S 17.2
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 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 - - - - - - - - - - - - - -

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 36,704 100 13,233 100 7,178 100 784 10.9 - 27.7 - 18.4 - 4
Less than 50 lbs 17,293 47.1 349 2.6 276 3.8 788 8.6 4 13.4 1.8 15.8 1.4 4.3
50 - 99 lbs 4,385 11.9 219 1.7 176 2.4 788 8.4 1.3 10.9 1.1 15 0.8 5
100 - 499 lbs 7,337 20 306 2.3 210 2.9 718 31.2 3 10.9 1.4 8.4 0.7 6
500 - 749 lbs S S 47 0.4 25 0.3 523 S S 22.5 0.2 23.5 0.1 17.6
750 - 999 lbs 185 0.5 14 0.1 6 0.1 450 35.9 0.2 34.3 0.1 29.9 - 15.2
1,000 - 9,999 lbs S S S S S S 1,080 S S S S S S 8
10,000 - 49,999 lbs 2,180 5.9 945 7.1 1,686 23.5 1,725 19.1 1.7 16.6 7.1 21.1 9.7 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 620 1.7 8,316 62.8 4,328 60.3 510 18.5 0.2 32.8 9.8 33.1 10.5 17.2

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 31,130 100 933 100 690 100 784 13.5 - 9.7 - 10.6 - 4.1
Less than 50 lbs 17,287 55.5 349 37.4 276 40 787 8.6 4.5 13.4 2.4 15.8 2.4 4.3
50 - 99 lbs 4,379 14.1 219 23.5 175 25.4 788 8.4 1.5 10.9 1.1 15 1.6 5
100 - 499 lbs 7,309 23.5 304 32.6 208 30.2 716 31.4 3.2 11 2 8.3 2.2 6.1
500 - 749 lbs S S 47 5 25 3.6 522 S S 22.6 1 23.5 1.1 17.7
750 - 999 lbs 175 0.6 13 1.4 6 0.8 434 37.4 0.2 36.1 0.4 31 0.2 15.7
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 5,322 100 5,904 100 2,906 100 795 23.6 - 48.2 - 13.5 - 21.8
Less than 50 lbs S S S S S S 1,141 S S S S S S 47.5
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 3 0.1 - - - - 892 20.2 0.2 46.4 - 42.5 - 5.8
750 - 999 lbs S S 1 - 1 - 786 S S 40.9 0.1 37.9 - 9.2
1,000 - 9,999 lbs S S S S S S 1,016 S S S S S S 6.3
10,000 - 49,999 lbs 2,015 37.9 877 14.9 1,397 48.1 1,579 19.8 10.9 16.3 10.5 17.8 9 5.2
50,000 - 99,999 lbs S S S S S S S S S S S S S S
More than 100,000 lbs 567 10.7 1,991 33.7 1,051 36.2 563 20.1 4.3 27.3 9.6 25.6 5 18.6

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 149 100 5,145 100 2,494 100 1,760 30.9 - 50 - 47.3 - 45.7
Less than 50 lbs - - - - - - - - - - - - - -
50 - 99 lbs - - - - - - - - - - - - - -
100 - 499 lbs S S - - - - 1,548 S S 26.1 - 26.9 0.1 0.9
500 - 749 lbs - - - - - - - - - - - - - -
750 - 999 lbs - - - - - - - - - - - - - -
1,000 - 9,999 lbs S S S S S S 2,066 S S S S S S 38.3
10,000 - 49,999 lbs 112 75.4 S S S S 4,151 38.7 10.4 S S S S 22.7
50,000 - 99,999 lbs - - - - - - - - - - - - - -
More than 100,000 lbs 29 19.5 5,084 98.8 S S 295 46.2 16.9 46.9 1.6 S S 48.2

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 53 100 7 100 9 100 1,353 43.4 - 42.3 - 44.5 - 13.8
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 53 100 7 100 9 100 1,353 43.4 - 42.3 - 44.5 - 13.8
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 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 - - - - - - - - - - - - - -
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 S S S S S S 300 S S S S S S 14
Less than 50 lbs 459 3.6 18 0.2 6 0.4 267 25.2 6.8 17.4 0.4 28.4 1.9 19
50 - 99 lbs 121 0.9 12 0.1 2 0.1 184 27.9 2.2 24.2 0.4 35.3 0.3 34.3
100 - 499 lbs 328 2.6 44 0.5 S S 270 35.5 5.4 32 1.1 S S 27.7
500 - 749 lbs 38 0.3 10 0.1 S S S 38 0.7 42.1 0.2 S S S
750 - 999 lbs 27 0.2 9 0.1 S S 156 28.3 0.7 36 0.4 S S 32.4
1,000 - 9,999 lbs S S S S S S 738 S S S S S S 20.6
10,000 - 49,999 lbs 1,352 10.6 S S 179 11.8 S 43.1 10.2 S S 43.2 8 S
50,000 - 99,999 lbs S S 1,337 14 S S 163 S S 48 9.3 S S 25.2
More than 100,000 lbs 71 0.6 624 6.5 83 5.5 S 32.9 1.5 41.7 7.4 40 7.1 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.