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.

Excel | CSV

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 171,728 100 120,267 100 37,123 100 642 5.4 - 12.4 - 18.7 - 11.4
Less than 50 lbs 37,603 21.9 548 0.5 384 1.0 715 14.2 3.0 13.5 0.1 17.5 0.2 12.1
50 - 99 lbs 8,042 4.7 298 0.2 127 0.3 414 14.6 0.6 14.4 - 16.9 0.1 13.4
100 - 499 lbs 17,657 10.3 1,296 1.1 441 1.2 359 5.8 0.7 6.0 0.2 9.8 0.3 11.4
500 - 749 lbs 4,907 2.9 581 0.5 178 0.5 308 10.4 0.3 12.2 0.1 12.8 0.1 10.6
750 - 999 lbs 3,140 1.8 546 0.5 135 0.4 247 13.3 0.3 14.3 0.1 24.5 0.2 20.1
1,000 - 9,999 lbs 33,416 19.5 9,387 7.8 2,406 6.5 263 7.8 1.1 11.7 1.0 12.0 1.1 11.5
10,000 - 49,999 lbs 48,542 28.3 53,163 44.2 13,234 35.6 249 11.5 2.4 12.1 4.8 14.6 6.2 12.2
50,000 - 99,999 lbs 7,981 4.6 26,358 21.9 2,892 7.8 109 26.7 1.2 22.6 3.6 24.5 2.1 41.9
More than 100,000 lbs 10,440 6.1 28,089 23.4 17,325 46.7 644 41.4 2.6 36.5 5.9 35.5 7.9 15.5

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 119,914 100 115,140 100 32,789 100 179 9.0 - 12.4 - 18.2 - 22.4
Less than 50 lbs 5,490 4.6 185 0.2 46 0.1 145 17.1 0.7 25.0 - 37.5 - 48.8
50 - 99 lbs 2,668 2.2 165 0.1 36 0.1 211 34.0 0.4 26.5 - 49.3 - 16.4
100 - 499 lbs 11,222 9.4 1,056 0.9 292 0.9 263 11.2 0.6 8.4 0.2 14.8 0.3 13.6
500 - 749 lbs 4,230 3.5 533 0.5 153 0.5 289 11.6 0.4 12.9 0.1 13.3 0.1 11.3
750 - 999 lbs 3,011 2.5 538 0.5 130 0.4 242 13.6 0.4 14.3 0.1 24.8 0.2 20.4
1,000 - 9,999 lbs 29,910 24.9 8,743 7.6 1,984 6.1 242 7.2 1.3 11.8 1.1 9.4 1.0 10.1
10,000 - 49,999 lbs 46,334 38.6 52,222 45.4 12,526 38.2 239 12.4 3.1 12.2 5.0 16.0 6.7 11.4
50,000 - 99,999 lbs 7,722 6.4 26,116 22.7 2,824 8.6 108 27.4 1.6 23.1 3.8 25.3 2.3 43.4
More than 100,000 lbs 9,326 7.8 25,580 22.2 14,797 45.1 553 42.6 3.3 37.0 5.7 36.2 8.2 17.6

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 107,025 100 90,386 100 17,946 100 154 9.1 - 11.5 - 13.7 - 22.3
Less than 50 lbs 3,335 3.1 178 0.2 39 0.2 111 14.9 0.6 26.1 - 44.0 0.1 45.4
50 - 99 lbs 2,275 2.1 162 0.2 S S 188 36.0 0.5 27.3 - S S 17.6
100 - 499 lbs 10,616 9.9 1,047 1.2 282 1.6 252 11.8 0.8 8.5 0.2 15.4 0.4 13.9
500 - 749 lbs 4,050 3.8 531 0.6 148 0.8 282 11.7 0.4 13.0 0.1 14.0 0.2 12.0
750 - 999 lbs 2,959 2.8 537 0.6 128 0.7 239 13.6 0.4 14.4 0.1 25.5 0.3 20.7
1,000 - 9,999 lbs 29,593 27.7 8,713 9.6 1,964 10.9 240 7.1 1.3 11.8 1.2 9.5 1.3 10.2
10,000 - 49,999 lbs 46,058 43.0 51,958 57.5 12,430 69.3 238 12.4 2.6 12.2 3.8 16.2 3.9 11.4
50,000 - 99,999 lbs 7,673 7.2 25,986 28.7 2,735 15.2 106 27.5 1.7 23.2 4.9 26.6 3.1 43.8
More than 100,000 lbs 465 0.4 1,275 1.4 189 1.1 189 44.5 0.2 26.9 0.4 43.7 0.7 45.1

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 69,706 100 53,348 100 15,805 100 585 11.0 - 14.4 - 15.2 - 8.0
Less than 50 lbs 1,126 1.6 58 0.1 33 0.2 654 17.1 0.4 42.4 - 48.0 0.1 13.5
50 - 99 lbs 487 0.7 37 0.1 S S 680 28.5 0.1 35.7 - S S 17.5
100 - 499 lbs 4,903 7.0 361 0.7 243 1.5 679 10.9 0.5 12.7 0.2 18.4 0.4 7.5
500 - 749 lbs 2,616 3.8 190 0.4 123 0.8 655 13.1 0.5 9.3 0.1 14.6 0.2 8.6
750 - 999 lbs 1,690 2.4 166 0.3 106 0.7 642 10.0 0.4 13.2 0.1 31.0 0.3 14.0
1,000 - 9,999 lbs 17,785 25.5 3,385 6.3 1,605 10.2 528 9.1 1.9 16.8 1.0 10.3 1.3 9.2
10,000 - 49,999 lbs 37,011 53.1 33,259 62.3 11,329 71.7 359 15.6 3.4 17.4 3.8 17.1 4.0 9.8
50,000 - 99,999 lbs 3,761 5.4 15,518 29.1 2,208 14.0 143 20.6 1.0 21.8 4.6 29.9 3.0 36.1
More than 100,000 lbs S S 375 0.7 S S 469 S S 40.9 1.1 S S 41.6

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 37,318 100 37,037 100 2,140 100 38 9.9 - 18.0 - 14.6 - 17.7
Less than 50 lbs 2,209 5.9 120 0.3 6 0.3 29 15.3 1.2 24.1 0.1 22.7 0.1 31.6
50 - 99 lbs 1,788 4.8 125 0.3 6 0.3 50 38.5 1.5 27.0 0.1 28.2 0.1 12.7
100 - 499 lbs 5,713 15.3 686 1.9 38 1.8 54 19.2 2.2 14.1 0.6 19.2 0.6 7.8
500 - 749 lbs 1,435 3.8 341 0.9 25 1.2 72 18.3 0.5 18.8 0.3 28.6 0.6 9.7
750 - 999 lbs 1,269 3.4 371 1.0 22 1.0 58 22.4 0.5 18.4 0.2 14.0 0.3 13.0
1,000 - 9,999 lbs 11,807 31.6 5,327 14.4 359 16.8 70 9.9 2.1 11.4 3.5 11.4 2.7 8.3
10,000 - 49,999 lbs 9,048 24.2 18,699 50.5 1,100 51.4 57 12.6 2.3 18.2 3.9 14.8 4.6 13.8
50,000 - 99,999 lbs 3,913 10.5 10,468 28.3 527 24.6 51 40.4 3.1 34.1 6.6 37.2 6.1 34.8
More than 100,000 lbs 137 0.4 900 2.4 56 2.6 S 32.3 0.1 42.9 1.1 36.7 0.8 S

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 1,164 100 3,799 100 S S 754 37.8 - 46.5 - S S 16.2
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 5 0.4 1 - S S S 49.2 1.9 30.8 0.1 S S S
500 - 749 lbs S S S S S S 999 S S S S S S 12.9
750 - 999 lbs - - - - - - - - - - - - - -
1,000 - 9,999 lbs 29 2.5 S S 9 0.4 S 4.9 3.7 S S 31.7 2.2 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 49 4.2 130 3.4 89 3.5 S 22.9 3.0 21.5 4.5 33.5 4.9 S
More than 100,000 lbs S S S S S S 668 S S S S S S 15.4

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 1,027 100 7,246 100 12,169 100 1,679 29.3 - 31.2 - 31.1 - 0.9
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 1,027 100.0 7,246 100.0 12,169 100.0 1,679 29.3 - 31.2 - 31.1 - 0.9

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 1,027 100 7,246 100 12,169 100 1,679 29.3 - 31.2 - 31.1 - 0.9
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 1,027 100.0 7,246 100.0 12,169 100.0 1,679 29.3 - 31.2 - 31.1 - 0.9

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 3,739 100 41 100 47 100 1,109 24.2 - 19.1 - 21.1 - 3.6
Less than 50 lbs 2,153 57.6 6 15.5 7 14.8 1,102 33.2 8.3 26.1 6.1 23.0 4.9 5.0
50 - 99 lbs 392 10.5 4 9.2 5 10.1 1,225 31.3 1.6 28.8 4.6 23.5 4.6 12.8
100 - 499 lbs 602 16.1 9 21.2 10 21.5 1,103 17.3 7.3 14.1 4.2 20.6 5.4 12.2
500 - 749 lbs 169 4.5 1 2.9 S S 2,770 36.5 2.4 33.5 3.6 S S 30.7
750 - 999 lbs 52 1.4 S S S S 1,189 35.5 2.4 S S S S 10.1
1,000 - 9,999 lbs 288 7.7 15 37.4 10 21.9 613 35.5 4.2 39.2 8.5 31.4 7.0 19.5
10,000 - 49,999 lbs S S 4 9.3 9 19.8 S S S 28.1 12.7 48.2 14.0 S
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 6,960 100 13,668 100 S S S 16.6 - 18.4 - 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 6,960 100.0 13,668 100.0 S S S 16.6 - 18.4 - 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 48,347 100 3,768 100 4,072 100 1,026 11.9 - 28.8 - 30.6 - 4.1
Less than 50 lbs 31,767 65.7 351 9.3 337 8.3 1,043 16.0 4.0 16.6 4.5 19.9 4.9 4.0
50 - 99 lbs 5,241 10.8 119 3.2 90 2.2 746 15.3 1.3 10.2 1.7 13.0 1.5 5.8
100 - 499 lbs 6,099 12.6 199 5.3 145 3.6 769 12.9 2.1 13.0 2.8 15.2 1.8 5.9
500 - 749 lbs 575 1.2 36 0.9 23 0.6 641 21.7 0.2 22.0 0.4 21.0 0.4 11.1
750 - 999 lbs 113 0.2 S S S S 1,315 44.1 0.1 S S S S 18.3
1,000 - 9,999 lbs S S S S S S 1,198 S S S S S S 29.8
10,000 - 49,999 lbs 1,119 2.3 319 8.5 598 14.7 1,898 41.5 0.7 32.0 4.2 35.5 6.3 9.8
50,000 - 99,999 lbs S S S S S S 1,601 S S S S S S 20.8
More than 100,000 lbs 999 2.1 2,460 65.3 S S 971 45.9 1.5 44.7 11.3 S S 15.3

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 43,698 100 702 100 590 100 1,025 11.6 - 12.5 - 15.6 - 4.1
Less than 50 lbs 31,742 72.6 351 50.0 337 57.1 1,043 16.0 3.3 16.6 2.2 19.9 2.7 4.0
50 - 99 lbs 5,231 12.0 119 16.9 90 15.3 745 15.2 1.6 10.3 1.3 13.1 1.6 5.8
100 - 499 lbs 6,053 13.9 197 28.0 141 23.9 761 12.9 2.1 13.0 2.5 15.4 2.8 6.0
500 - 749 lbs 567 1.3 34 4.9 20 3.4 586 21.8 0.3 22.9 1.1 23.3 0.7 10.8
750 - 999 lbs 104 0.2 2 0.2 1 0.2 804 47.0 0.1 30.4 0.1 32.9 0.2 22.4
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-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 3,964 100 2,360 100 2,545 100 1,230 41.9 - 34.1 - 29.3 - 11.6
Less than 50 lbs S S S S S S 1,343 S S S S S S 41.2
50 - 99 lbs S S S S S S 1,452 S S S S S S 27.9
100 - 499 lbs S S 2 0.1 S S 1,235 S S 48.2 0.2 S S 20.2
500 - 749 lbs 8 0.2 S S S S 1,964 37.7 0.3 S S S S 15.1
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 1,064 S S S S S S 21.7
10,000 - 49,999 lbs 1,049 26.5 308 13.1 531 20.9 1,778 41.4 9.0 31.7 8.3 33.8 8.7 8.9
50,000 - 99,999 lbs 7 0.2 S S S S 1,188 44.7 3.8 S S S S 15.6
More than 100,000 lbs 708 17.9 1,787 75.7 1,720 67.6 972 34.9 11.6 42.2 9.8 41.2 10.3 15.6

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 S S S S 3,589 S S S S S S 25.9
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 - - - - - - - - - - - - - -
750 - 999 lbs - - - - - - - - - - - - - -
1,000 - 9,999 lbs 109 16.4 S S 37 4.0 3,702 38.1 16.6 S S 38.0 17.6 18.5
10,000 - 49,999 lbs S S S S S S 5,215 S S S S S S 45.3
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 947 S S S S S S 23.0

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

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 3,467 100 1,359 100 263 100 91 26.7 - 35.9 - 28.3 - 42.1
Less than 50 lbs 345 10.0 13 0.9 1 0.4 S 20.4 5.4 22.6 0.5 26.5 0.4 S
50 - 99 lbs 134 3.9 13 1.0 1 0.3 S 19.8 2.5 22.0 0.6 40.6 0.2 S
100 - 499 lbs 335 9.7 40 3.0 S S S 24.2 3.9 26.8 2.7 S S S
500 - 749 lbs S S 13 0.9 2 0.8 S S S 31.1 1.0 49.3 2.0 S
750 - 999 lbs 16 0.5 5 0.4 S S S 48.8 0.4 41.8 0.3 S S S
1,000 - 9,999 lbs 1,271 36.7 395 29.0 118 45.1 S 42.3 6.7 31.8 9.0 28.6 10.3 S
10,000 - 49,999 lbs 1,089 31.4 S S 109 41.7 S 40.0 8.7 S S 47.3 10.4 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 100 S S S S S S 20.5

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.