Table 4. Shipment Characteristics by Mode of Transportation and Shipment Size for Metropolitan Area of Origin: 2007

Table 4. Shipment Characteristics by Mode of Transportation and Shipment Size for Metropolitan Area of Origin: 2007

Estimates are based on data from the 2007 Commodity Flow Survey. Because of rounding, estimates may not be additive.

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All Modes

Shipment Weight Value Tons Ton-miles2 Average miles
per shipment
Value Tons Ton-miles Average miles per shipment CV
2007
(million $)
Percent of total 2007
(thousands)
Percent of total 2007
(millions)
Percent of
total
CV3 Standard Error of % CV Standard Error of % CV Standard Error of %
Total 139,642 100 137,063 100 19,756 100 744 11.7 - 24.8 - 16.3 - 12.8
Less than 50 lbs 24,427 17.5 449 0.3 326 1.6 839 29.4 4.5 21.3 0.1 31.7 0.6 11.0
50 - 99 lbs 4,128 3.0 201 0.1 74 0.4 368 6.8 0.3 9.7 - 8.0 0.1 10.5
100 - 499 lbs 12,947 9.3 1,144 0.8 296 1.5 277 9.2 0.7 6.8 0.2 12.9 0.3 10.1
500 - 749 lbs 3,915 2.8 665 0.5 147 0.7 222 15.8 0.4 9.8 0.2 21.8 0.2 21.2
750 - 999 lbs 3,367 2.4 788 0.6 123 0.6 156 14.0 0.2 10.8 0.2 28.8 0.2 12.3
1,000 - 9,999 lbs 29,534 21.1 9,337 6.8 2,069 10.5 200 15.2 1.9 6.9 2.2 19.1 1.7 10.9
10,000 - 49,999 lbs 39,389 28.2 68,779 50.2 8,247 41.7 137 16.0 1.9 22.1 4.5 15.0 4.3 18.9
50,000 - 99,999 lbs 10,717 7.7 29,132 21.3 1,716 8.7 55 39.2 2.1 45.2 3.6 32.3 1.6 36.1
More than 100,000 lbs 11,219 8.0 26,568 19.4 6,759 34.2 S 30.4 2.3 34.0 4.4 26.7 4.9 S

Single modes

Shipment Weight Value Tons Ton-miles2 Average miles
per shipment
Value Tons Ton-miles Average miles per shipment CV
2007
(million $)
Percent of total 2007
(thousands)
Percent of total 2007
(millions)
Percent of
total
CV3 Standard Error of % CV Standard Error of % CV Standard Error of %
Total 104,966 100 128,288 100 15,860 100 191 14.7 - 26.5 - 15.2 - 9.2
Less than 50 lbs 2,553 2.4 89 0.1 17 0.1 241 17.8 0.5 19.0 - 23.7 - 20.3
50 - 99 lbs 1,443 1.4 105 0.1 15 0.1 137 11.9 0.2 14.8 - 13.5 - 17.4
100 - 499 lbs 8,441 8.0 932 0.7 171 1.1 174 9.6 0.8 7.9 0.2 15.2 0.2 12.1
500 - 749 lbs 3,275 3.1 626 0.5 132 0.8 210 14.8 0.4 10.3 0.2 20.5 0.2 20.0
750 - 999 lbs 2,869 2.7 764 0.6 116 0.7 151 14.3 0.2 11.7 0.2 30.0 0.2 12.3
1,000 - 9,999 lbs 27,867 26.5 9,203 7.2 2,001 12.6 195 15.1 2.3 7.2 2.4 19.8 1.6 11.2
10,000 - 49,999 lbs 38,470 36.6 68,009 53.0 7,923 50.0 133 16.5 1.7 22.5 4.2 15.8 4.5 19.9
50,000 - 99,999 lbs 10,653 10.1 29,008 22.6 1,660 10.5 54 39.5 2.4 45.5 3.6 33.0 1.9 37.5
More than 100,000 lbs 9,396 9.0 19,553 15.2 3,826 24.1 S 27.9 2.1 38.4 3.1 21.1 4.5 S

Truck4

Shipment Weight Value Tons Ton-miles2 Average miles
per shipment
Value Tons Ton-miles Average miles per shipment CV
2007
(million $)
Percent of total 2007
(thousands)
Percent of total 2007
(millions)
Percent of
total
CV3 Standard Error of % CV Standard Error of % CV Standard Error of %
Total 92,260 100 104,352 100 12,002 100 178 14.4 - 24.2 - 14.4 - 9.2
Less than 50 lbs 2,191 2.4 87 0.1 15 0.1 211 21.1 0.5 19.2 - 26.6 - 23.3
50 - 99 lbs 1,253 1.4 103 0.1 12 0.1 119 12.8 0.2 14.8 - 17.0 - 21.8
100 - 499 lbs 8,069 8.7 925 0.9 164 1.4 168 10.5 0.7 7.9 0.2 15.7 0.2 12.6
500 - 749 lbs 3,224 3.5 623 0.6 131 1.1 210 15.0 0.3 10.5 0.2 20.5 0.2 19.8
750 - 999 lbs 2,761 3.0 759 0.7 110 0.9 145 14.6 0.2 11.8 0.2 32.0 0.2 14.1
1,000 - 9,999 lbs 27,563 29.9 9,008 8.6 1,974 16.4 194 15.4 2.1 7.4 2.4 20.0 2.1 11.5
10,000 - 49,999 lbs 37,912 41.1 66,999 64.2 7,776 64.8 133 16.5 2.1 22.2 4.2 15.7 3.0 19.1
50,000 - 99,999 lbs 8,748 9.5 24,256 23.2 1,282 10.7 50 40.9 2.6 47.9 4.0 32.4 1.8 40.9
More than 100,000 lbs 539 0.6 1,592 1.5 537 4.5 S 29.1 0.2 35.8 0.8 33.8 2.0 S

For-hire truck

Shipment Weight Value Tons Ton-miles2 Average miles
per shipment
Value Tons Ton-miles Average miles per shipment CV
2007
(million $)
Percent of total 2007
(thousands)
Percent of total 2007
(millions)
Percent of
total
CV3 Standard Error of % CV Standard Error of % CV Standard Error of %
Total 46,149 100 37,613 100 8,290 100 637 8.1 - 17.2 - 9.7 - 10.4
Less than 50 lbs 536 1.2 14 - 13 0.2 1,016 23.7 0.2 26.2 - 31.9 0.1 10.9
50 - 99 lbs 450 1.0 15 - 9 0.1 626 18.9 0.2 15.7 - 21.3 - 11.5
100 - 499 lbs 3,806 8.2 198 0.5 123 1.5 608 16.1 0.9 11.6 0.1 17.3 0.3 11.2
500 - 749 lbs 1,767 3.8 149 0.4 108 1.3 717 17.0 0.6 10.3 0.2 22.8 0.3 12.8
750 - 999 lbs 1,471 3.2 143 0.4 84 1.0 588 21.7 0.5 14.8 0.1 27.9 0.2 11.2
1,000 - 9,999 lbs 15,436 33.4 2,570 6.8 1,415 17.1 571 9.8 3.1 6.0 2.2 9.3 1.9 9.5
10,000 - 49,999 lbs 20,298 44.0 28,183 74.9 5,684 68.6 239 10.8 3.0 21.7 4.5 13.8 4.0 19.5
50,000 - 99,999 lbs S S 5,933 15.8 407 4.9 S S S 30.3 4.3 21.9 1.3 S
More than 100,000 lbs 442 1.0 409 1.1 448 5.4 788 30.7 0.3 23.5 0.7 38.9 3.4 19.1

Private truck

Shipment Weight Value Tons Ton-miles2 Average miles
per shipment
Value Tons Ton-miles Average miles per shipment CV
2007
(million $)
Percent of total 2007
(thousands)
Percent of total 2007
(millions)
Percent of
total
CV3 Standard Error of % CV Standard Error of % CV Standard Error of %
Total 46,111 100 66,739 100 3,712 100 49 24.1 - 34.9 - 33.2 - 12.8
Less than 50 lbs 1,655 3.6 73 0.1 3 0.1 35 25.7 1.0 21.0 0.1 19.1 - 14.7
50 - 99 lbs 803 1.7 89 0.1 3 0.1 37 11.6 0.3 17.0 - 17.9 0.1 13.9
100 - 499 lbs 4,263 9.2 727 1.1 41 1.1 58 16.4 1.6 8.8 0.4 45.4 0.4 26.0
500 - 749 lbs 1,457 3.2 474 0.7 S S 48 30.9 0.8 13.6 0.2 S S 16.3
750 - 999 lbs 1,290 2.8 616 0.9 26 0.7 42 15.9 0.6 13.5 0.3 45.1 0.2 20.7
1,000 - 9,999 lbs 12,127 26.3 6,439 9.6 S S 71 23.5 3.5 9.0 3.8 S S 30.0
10,000 - 49,999 lbs 17,614 38.2 38,816 58.2 2,092 56.4 57 32.5 3.0 31.4 3.9 32.3 3.5 19.3
50,000 - 99,999 lbs S S S S 875 23.6 S S S S S 48.2 4.6 S
More than 100,000 lbs 98 0.2 1,183 1.8 89 2.4 75 45.2 0.3 42.6 1.8 46.8 2.0 24.5

Rail

Shipment Weight Value Tons Ton-miles2 Average miles
per shipment
Value Tons Ton-miles Average miles per shipment CV
2007
(million $)
Percent of total 2007
(thousands)
Percent of total 2007
(millions)
Percent of
total
CV3 Standard Error of % CV Standard Error of % CV Standard Error of %
Total 3,776 100 4,864 100 2,431 100 S 24.3 - 27.7 - 24.4 - 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 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 S S S S S S S S S S
10,000 - 49,999 lbs 172 4.5 61 1.3 S S S 48.4 7.7 42.2 4.9 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 3,470 91.9 4,740 97.4 2,349 96.6 S 23.7 6.8 28.1 4.3 25.8 4.6 S

Water

Shipment Weight Value Tons Ton-miles2 Average miles
per shipment
Value Tons Ton-miles Average miles per shipment CV
2007
(million $)
Percent of total 2007
(thousands)
Percent of total 2007
(millions)
Percent of
total
CV3 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-miles2 Average miles
per shipment
Value Tons Ton-miles Average miles per shipment CV
2007
(million $)
Percent of total 2007
(thousands)
Percent of total 2007
(millions)
Percent of
total
CV3 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-miles2 Average miles
per shipment
Value Tons Ton-miles Average miles per shipment CV
2007
(million $)
Percent of total 2007
(thousands)
Percent of total 2007
(millions)
Percent of
total
CV3 Standard Error of % CV Standard Error of % CV Standard Error of %
Total 1,189 100 20 100 S S 1,428 21.0 - 44.0 - S S 7.4
Less than 50 lbs 362 30.5 2 8.3 2 7.2 1,422 26.3 7.5 22.1 5.9 22.5 5.5 8.5
50 - 99 lbs S S 1 6.8 2 6.9 1,598 S S 24.4 4.1 32.1 3.3 12.9
100 - 499 lbs 366 30.8 6 30.2 7 22.3 1,201 27.0 8.4 30.7 8.1 33.5 10.4 17.2
500 - 749 lbs 41 3.4 1 2.6 1 1.8 1,000 48.6 2.7 29.9 3.9 41.7 5.9 44.2
750 - 999 lbs 97 8.2 S S S S 2,061 38.9 13.0 S S S S 37.5
1,000 - 9,999 lbs S S S S S S 1,652 S S S S S S 24.7
10,000 - 49,999 lbs - - - - - - - - - - - - - -
50,000 - 99,999 lbs - - - - - - - - - - - - - -
More than 100,000 lbs - - - - - - - - - - - - - -

Pipeline5

Shipment Weight Value Tons Ton-miles2 Average miles
per shipment
Value Tons Ton-miles Average miles per shipment CV
2007
(million $)
Percent of total 2007
(thousands)
Percent of total 2007
(millions)
Percent of
total
CV3 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 1.0 157 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 2.0 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-miles2 Average miles
per shipment
Value Tons Ton-miles Average miles per shipment CV
2007
(million $)
Percent of total 2007
(thousands)
Percent of total 2007
(millions)
Percent of
total
CV3 Standard Error of % CV Standard Error of % CV Standard Error of %
Total 31,363 100 7,766 100 3,762 100 894 22.8 - 45.4 - 43.2 - 8.1
Less than 50 lbs 21,520 68.6 349 4.5 307 8.2 902 33.0 6.4 27.6 8.5 33.9 7.4 8.7
50 - 99 lbs 2,459 7.8 94 1.2 59 1.6 626 13.9 1.6 15.7 2.4 11.5 2.2 12.0
100 - 499 lbs 4,170 13.3 180 2.3 122 3.2 701 15.6 2.9 13.3 5.3 15.1 4.2 6.5
500 - 749 lbs 623 2.0 37 0.5 15 0.4 435 28.9 0.7 23.3 1.7 44.5 0.5 22.3
750 - 999 lbs 40 0.1 S S 4 0.1 S 39.7 0.2 S S 41.6 0.2 S
1,000 - 9,999 lbs S S S S 12 0.3 S S S S S 42.8 0.7 S
10,000 - 49,999 lbs 390 1.2 178 2.3 S S 1,531 49.8 0.4 48.6 5.3 S S 21.3
50,000 - 99,999 lbs 53 0.2 S S S S S 37.3 0.7 S S S S S
More than 100,000 lbs S S S S S S S S S S S S S S

Parcel, U.S.P.S. or courier

Shipment Weight Value Tons Ton-miles2 Average miles
per shipment
Value Tons Ton-miles Average miles per shipment CV
2007
(million $)
Percent of total 2007
(thousands)
Percent of total 2007
(millions)
Percent of
total
CV3 Standard Error of % CV Standard Error of % CV Standard Error of %
Total 28,687 100 658 100 505 100 894 25.5 - 18.4 - 23.1 - 8.1
Less than 50 lbs 21,520 75.0 349 53.1 307 60.9 902 33.0 5.2 27.6 6.2 33.9 8.2 8.7
50 - 99 lbs 2,459 8.6 94 14.3 59 11.7 626 13.9 1.7 15.7 1.1 11.5 2.2 12.0
100 - 499 lbs 4,166 14.5 180 27.3 122 24.2 702 15.6 3.5 13.4 5.2 15.1 6.4 6.4
500 - 749 lbs 516 1.8 33 5.0 14 2.8 478 36.5 0.8 26.9 1.0 45.6 0.6 20.6
750 - 999 lbs 25 0.1 2 0.4 S S S 32.1 0.1 49.1 0.2 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 - - - - - - - - - - - - - -
50,000 - 99,999 lbs - - - - - - - - - - - - - -
More than 100,000 lbs - - - - - - - - - - - - - -

Truck and rail

Shipment Weight Value Tons Ton-miles2 Average miles
per shipment
Value Tons Ton-miles Average miles per shipment CV
2007
(million $)
Percent of total 2007
(thousands)
Percent of total 2007
(millions)
Percent of
total
CV3 Standard Error of % CV Standard Error of % CV Standard Error of %
Total 666 100 S S S S S 24.6 - S S S S S
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 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 17 2.6 S S 3 0.1 S 33.6 5.9 S S 30.9 1.9 S
10,000 - 49,999 lbs 247 37.2 S S S S 1,981 39.7 14.2 S S S S 15.2
50,000 - 99,999 lbs S S S S S S 774 S S S S S S 5.7
More than 100,000 lbs 334 50.2 S S S S 1,087 28.1 14.7 S S S S 31.1

Truck and water

Shipment Weight Value Tons Ton-miles2 Average miles
per shipment
Value Tons Ton-miles Average miles per shipment CV
2007
(million $)
Percent of total 2007
(thousands)
Percent of total 2007
(millions)
Percent of
total
CV3 Standard Error of % CV Standard Error of % CV Standard Error of %
Total S S 112 100 90 100 1,212 S S 31.2 - 26.9 - 22.5
Less than 50 lbs - - - - - - - - - - - - - -
50 - 99 lbs - - - - - - - - - - - - - -
100 - 499 lbs 1 0.2 - 0.1 S S S 32.6 8.9 17.6 12.2 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 3 2.9 S S 2,435 S S 45.9 15.5 S S 46.3
10,000 - 49,999 lbs S S S S 26 28.8 459 S S S S 33.2 19.9 38.2
50,000 - 99,999 lbs S S S S S S S S S S S S S S
More than 100,000 lbs S S S S S S S S S S S S S S

Rail and water

Shipment Weight Value Tons Ton-miles2 Average miles
per shipment
Value Tons Ton-miles Average miles per shipment CV
2007
(million $)
Percent of total 2007
(thousands)
Percent of total 2007
(millions)
Percent of
total
CV3 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 - - - - - - - - - - - - - -
10,000 - 49,999 lbs - - - - - - - - - - - - - -
50,000 - 99,999 lbs - - - - - - - - - - - - - -
More than 100,000 lbs - - - - - - - - - - - - - -

Other multiple modes

Shipment Weight Value Tons Ton-miles2 Average miles
per shipment
Value Tons Ton-miles Average miles per shipment CV
2007
(million $)
Percent of total 2007
(thousands)
Percent of total 2007
(millions)
Percent of
total
CV3 Standard Error of % CV Standard Error of % CV Standard Error of %
Total S S S S S S 254 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 254 S S S S S S -

Other and unknown modes

Shipment Weight Value Tons Ton-miles2 Average miles
per shipment
Value Tons Ton-miles Average miles per shipment CV
2007
(million $)
Percent of total 2007
(thousands)
Percent of total 2007
(millions)
Percent of
total
CV3 Standard Error of % CV Standard Error of % CV Standard Error of %
Total 3,314 100 1,009 100 133 100 72 23.8 - 37.8 - 23.2 - 47.7
Less than 50 lbs 354 10.7 S S S S S 41.2 2.1 S S S S S
50 - 99 lbs S S 3 0.3 S S 112 S S 29.2 0.4 S S 27.1
100 - 499 lbs 337 10.2 32 3.1 S S 109 19.3 4.0 20.5 2.8 S S 45.1
500 - 749 lbs 17 0.5 2 0.2 - 0.1 S 35.2 0.6 40.5 0.9 43.8 0.2 S
750 - 999 lbs S S S S S S S S S S S S S S
1,000 - 9,999 lbs 1,253 37.8 121 12.0 56 41.8 534 34.4 7.7 27.7 10.2 31.2 9.1 40.6
10,000 - 49,999 lbs 529 16.0 S S 56 41.9 S 48.6 6.0 S S 35.3 9.2 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

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 Commodity Flow Survey (CFS) geographic areas were drawn from a subset of Combined Statistical Areas (CSAs) and Metropolitan Statistical Areas (MeSAs) as defined by the Office of Management and Budget (OMB). However, CFS metropolitan areas are divided into their state parts when they include more than one state. In addition, the CFS also utilizes a unique geography referred to as, "remainder of state," to represent those areas of a state not contained within a separately published metropolitan area for the CFS (as opposed to not part of any Core-Based Statistical Area (CBSA) as defined by OMB). Because of the differences in the CFS geography, as compared to OMB defined geography, caution should be exercised when comparing CFS estimates to other estimates of similar geography.
2 Ton-miles estimates are based on estimated distances traveled along a modeled transportation network.
3 Coefficient of Variation.
4 ""Truck"" as a single mode includes any shipment that was made by private truck only, by for-hire truck only, or by a combination of private and for-hire truck.
5 Estimates for pipeline exclude shipments of crude petroleum.

NOTES: Value-of-shipment estimates are reported in current prices. 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/
Rows are not shown if all cells for that particular mode have no data. For example, since Denver-Aurora-Boulder by "Water" has no data for any shipment weight group, the entire mode of "Water" for that area was removed from this table. However, if a mode has at least one row of data for one of the shipment weight groups, then the entire mode is shown even though there may be rows absent of data within that mode. For example, Denver-Aurora-Boulder by "Other and unknown modes" has a row absent of data for the shipment size of "More than 100,000 lbs" but does have data for the other shipment weight groups under that mode so it will be shown in its entirety.

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.