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 85,504 100 60,263 100 12,149 100 357 5.6 - 14.6 - 19.6 - 5.5
Less than 50 lbs 7,528 8.8 161 0.3 63 0.5 415 9.1 0.8 9.0 0.1 10.3 0.1 8.0
50 - 99 lbs 2,650 3.1 116 0.2 36 0.3 313 19.1 0.5 9.1 - 12.2 0.1 12.2
100 - 499 lbs 10,854 12.7 755 1.3 207 1.7 266 17.6 2.1 4.2 0.4 10.2 0.4 9.9
500 - 749 lbs 2,726 3.2 346 0.6 99 0.8 283 5.5 0.2 7.8 0.2 11.6 0.1 10.3
750 - 999 lbs 2,216 2.6 311 0.5 88 0.7 284 9.8 0.2 9.3 0.2 20.3 0.3 13.9
1,000 - 9,999 lbs 21,222 24.8 6,026 10.0 1,519 12.5 271 7.4 1.8 14.0 3.4 11.5 3.5 7.2
10,000 - 49,999 lbs 32,294 37.8 41,087 68.2 8,122 66.8 205 8.0 2.0 21.1 6.0 26.5 5.4 14.1
50,000 - 99,999 lbs 5,093 6.0 7,880 13.1 606 5.0 76 36.8 1.5 30.3 4.0 26.7 1.8 19.4
More than 100,000 lbs 920 1.1 3,582 5.9 S S S 32.2 0.4 44.1 3.3 S S 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 71,841 100 57,956 100 10,015 100 175 7.1 - 14.5 - 20.9 - 7.5
Less than 50 lbs 1,970 2.7 74 0.1 8 0.1 118 11.8 0.3 14.0 0.1 10.7 - 16.8
50 - 99 lbs 1,141 1.6 67 0.1 10 0.1 138 31.5 0.4 11.3 - 14.3 - 15.5
100 - 499 lbs 8,447 11.8 680 1.2 162 1.6 221 18.1 2.0 4.3 0.3 11.5 0.4 12.0
500 - 749 lbs 2,371 3.3 328 0.6 95 0.9 284 7.5 0.3 8.4 0.2 12.2 0.1 10.3
750 - 999 lbs 2,156 3.0 306 0.5 72 0.7 231 9.9 0.3 9.2 0.2 13.0 0.1 12.4
1,000 - 9,999 lbs 20,853 29.0 5,937 10.2 1,448 14.5 261 7.2 1.7 14.1 3.4 11.4 3.4 7.4
10,000 - 49,999 lbs 29,242 40.7 39,623 68.4 6,667 66.6 178 7.9 1.6 20.9 5.8 31.9 5.4 15.3
50,000 - 99,999 lbs 5,068 7.1 7,839 13.5 600 6.0 76 36.9 1.7 30.4 4.0 26.6 2.0 19.5
More than 100,000 lbs 593 0.8 3,102 5.4 S S S 33.3 0.4 44.7 3.0 S S 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 70,365 100 56,108 100 9,136 100 161 7.2 - 15.1 - 22.4 - 7.9
Less than 50 lbs 1,779 2.5 73 0.1 7 0.1 90 13.4 0.4 14.4 0.1 12.3 - 16.4
50 - 99 lbs 1,104 1.6 67 0.1 9 0.1 131 32.1 0.4 11.4 - 13.3 - 14.6
100 - 499 lbs 7,853 11.2 673 1.2 155 1.7 212 16.5 1.8 4.4 0.3 11.3 0.3 11.6
500 - 749 lbs 2,313 3.3 327 0.6 94 1.0 283 6.8 0.3 8.5 0.2 12.1 0.1 10.3
750 - 999 lbs 2,095 3.0 305 0.5 70 0.8 228 10.4 0.3 9.3 0.2 13.0 0.1 12.5
1,000 - 9,999 lbs 20,777 29.5 5,927 10.6 1,440 15.8 260 7.3 1.7 14.1 3.4 11.5 3.3 7.5
10,000 - 49,999 lbs 29,147 41.4 39,575 70.5 6,612 72.4 177 7.9 1.5 20.9 5.6 32.2 4.8 15.6
50,000 - 99,999 lbs 5,034 7.2 7,794 13.9 593 6.5 75 37.2 1.7 30.6 4.1 27.0 2.1 19.7
More than 100,000 lbs 263 0.4 S S 157 1.7 S 26.7 0.1 S S 37.5 1.0 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 44,729 100 27,881 100 7,488 100 442 7.0 - 26.0 - 28.2 - 6.5
Less than 50 lbs 459 1.0 9 - 4 - 340 13.9 0.2 21.1 - 19.0 - 23.8
50 - 99 lbs S S 12 - 6 0.1 531 S S 17.8 - 19.6 - 6.7
100 - 499 lbs 5,242 11.7 220 0.8 124 1.7 532 23.2 2.4 13.8 0.5 13.4 0.5 4.5
500 - 749 lbs 1,521 3.4 122 0.4 75 1.0 608 11.3 0.4 14.0 0.2 13.3 0.2 5.4
750 - 999 lbs 1,271 2.8 117 0.4 57 0.8 485 14.0 0.4 15.3 0.2 14.1 0.2 10.3
1,000 - 9,999 lbs 13,079 29.2 2,061 7.4 1,053 14.1 552 7.1 1.8 6.6 2.7 8.2 2.8 4.2
10,000 - 49,999 lbs 18,135 40.5 19,690 70.6 5,584 74.6 305 5.6 1.7 36.8 7.3 38.6 5.2 14.1
50,000 - 99,999 lbs 4,252 9.5 5,440 19.5 481 6.4 S 45.2 3.0 41.9 7.1 31.7 2.7 S
More than 100,000 lbs 227 0.5 209 0.8 103 1.4 S 17.6 0.2 47.7 0.7 35.3 1.0 S

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 25,636 100 28,228 100 1,648 100 59 10.9 - 18.2 - 11.7 - 5.1
Less than 50 lbs 1,320 5.1 64 0.2 3 0.2 43 18.1 1.4 16.7 0.1 23.3 - 7.8
50 - 99 lbs 562 2.2 55 0.2 3 0.2 48 12.9 0.3 13.7 - 9.9 - 8.8
100 - 499 lbs 2,610 10.2 452 1.6 31 1.9 68 7.7 1.1 7.8 0.4 7.4 0.4 17.7
500 - 749 lbs 792 3.1 205 0.7 19 1.1 90 11.9 0.3 9.7 0.2 11.5 0.3 16.2
750 - 999 lbs 824 3.2 188 0.7 13 0.8 70 19.6 0.5 13.9 0.3 22.4 0.3 19.6
1,000 - 9,999 lbs 7,698 30.0 3,867 13.7 387 23.5 105 15.7 3.1 20.3 4.4 29.1 5.7 12.9
10,000 - 49,999 lbs 11,012 43.0 19,885 70.4 1,028 62.4 56 18.4 3.7 21.7 4.7 15.0 4.8 15.5
50,000 - 99,999 lbs 781 3.0 2,354 8.3 112 6.8 S 29.3 1.6 34.7 3.0 28.5 1.9 S
More than 100,000 lbs 35 0.1 S S S S 126 37.4 0.1 S S S S 31.9

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 389 100 S S 367 100 585 38.8 - S S 41.7 - 28.8
Less than 50 lbs S S S S S S 648 S S S S S S 0.6
50 - 99 lbs - - - - - - - - - - - - - -
100 - 499 lbs S S S S S S S S S S S S S S
500 - 749 lbs 2 0.5 S S S S 971 43.3 0.3 S S S S 45.1
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 4 1.2 1,552 S S S S 46.8 18.1 21.3
10,000 - 49,999 lbs 94 24.1 S S 55 15.1 1,024 39.5 16.4 S S 37.8 18.5 23.7
50,000 - 99,999 lbs 25 6.3 35 2.5 7 2.0 S 41.2 13.9 35.5 10.3 25.6 3.4 S
More than 100,000 lbs 229 58.9 S S 299 81.5 S 34.2 10.9 S S 38.7 8.0 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

Great Lakes

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 975 100 16 100 14 100 913 31.6 - 26.9 - 24.6 - 8.1
Less than 50 lbs S S 1 7.3 1 6.8 885 S S 25.2 5.0 23.4 4.1 8.5
50 - 99 lbs 36 3.7 - 3.0 S S 1,161 48.6 2.1 41.6 1.0 S S 17.8
100 - 499 lbs S S 6 38.6 7 47.9 1,094 S S 33.5 8.6 34.6 8.8 10.2
500 - 749 lbs S S S S S S 906 S S S S S S 21.1
750 - 999 lbs S S S S 1 10.8 972 S S S S 36.4 6.7 15.3
1,000 - 9,999 lbs 53 5.5 6 36.3 4 25.4 621 30.4 5.6 46.3 10.7 42.9 7.9 38.6
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 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 S S S S S S S S S S S 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 11,918 100 1,450 100 1,871 100 646 16.6 - 39.4 - 48.9 - 5.2
Less than 50 lbs 5,420 45.5 81 5.6 55 2.9 647 13.7 4.6 9.4 5.3 12.2 4.4 5.5
50 - 99 lbs 1,475 12.4 46 3.2 26 1.4 577 16.3 1.4 17.1 4.1 13.0 3.3 10.5
100 - 499 lbs 2,343 19.7 68 4.7 44 2.4 636 27.3 3.1 14.1 4.4 11.9 3.0 9.3
500 - 749 lbs 319 2.7 15 1.1 4 0.2 273 35.7 1.2 41.2 1.8 25.2 0.4 32.6
750 - 999 lbs 53 0.4 S S S S 4,386 44.5 0.2 S S S S 26.8
1,000 - 9,999 lbs 56 0.5 S S 34 1.8 2,537 36.5 0.3 S S 36.7 3.7 31.4
10,000 - 49,999 lbs S S S S S S 1,765 S S S S S S 16.3
50,000 - 99,999 lbs 3 - S S 2 0.1 S 22.4 0.1 S S 44.8 2.3 S
More than 100,000 lbs 65 0.5 S S S S S 33.3 0.7 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 9,526 100 210 100 129 100 641 14.2 - 9.9 - 7.3 - 5.1
Less than 50 lbs 5,414 56.8 81 38.6 55 42.4 648 13.8 3.1 9.5 2.9 12.2 3.5 5.5
50 - 99 lbs 1,473 15.5 46 21.9 26 20.5 578 16.4 1.2 17.2 2.2 13.1 2.2 10.5
100 - 499 lbs 2,314 24.3 67 32.1 43 33.7 633 27.7 3.3 14.5 2.4 12.7 3.3 9.5
500 - 749 lbs 299 3.1 15 7.1 4 3.0 255 37.9 1.5 42.2 2.7 27.9 1.2 36.1
750 - 999 lbs 26 0.3 1 0.4 - 0.4 527 34.3 0.2 28.7 0.2 32.5 0.2 49.1
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 S S 941 100 S S 1,077 S S 48.2 - S S 17.2
Less than 50 lbs S S - - - - S S S 27.4 0.1 8.3 - S
50 - 99 lbs 2 0.1 - - S S S 46.6 1.2 35.0 0.3 S S S
100 - 499 lbs S S 1 0.1 1 0.1 1,150 S S 35.7 1.0 27.8 1.0 49.9
500 - 749 lbs S S - 0.1 - - 785 S S 23.5 6.0 27.3 5.2 44.1
750 - 999 lbs 2 0.1 S S S S 634 17.6 5.8 S S S S 43.7
1,000 - 9,999 lbs S S 1 0.1 S S 1,925 S S 46.0 2.4 S S 33.0
10,000 - 49,999 lbs S S S S S S 1,417 S S S S S S 7.9
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

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 186 100 66 100 S S 3,981 31.1 - 44.3 - S S 18.7
Less than 50 lbs - - - - - - - - - - - - - -
50 - 99 lbs - - - - - - - - - - - - - -
100 - 499 lbs - - - - - - - - - - - - - -
500 - 749 lbs - - - - - - - - - - - - - -
750 - 999 lbs S S S S S S 6,321 S S S S S S 44.2
1,000 - 9,999 lbs S S S S S S S S S S S S S S
10,000 - 49,999 lbs 93 50.2 S S S S 2,940 16.9 18.7 S S S S 28.6
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 4,503 S S S S S S 25.6
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 90 99.9 S S S S 4,448 26.8 0.1 S S S S 28.1
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 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 S S 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 1,745 100 858 100 S S 75 40.2 - 45.2 - S S 36.1
Less than 50 lbs 138 7.9 5 0.6 - 0.1 38 21.4 4.3 25.4 1.1 29.0 0.1 35.4
50 - 99 lbs 34 2.0 2 0.3 - - S 31.7 1.2 26.2 0.5 44.3 - S
100 - 499 lbs 64 3.7 7 0.8 1 0.4 S 36.1 1.9 30.2 1.1 23.6 1.8 S
500 - 749 lbs S S 3 0.3 1 0.2 S S S 34.8 0.5 48.5 0.2 S
750 - 999 lbs S S 1 0.2 S S 235 S S 45.5 0.2 S S 32.7
1,000 - 9,999 lbs 313 18.0 77 9.0 37 13.9 540 28.2 8.9 18.9 11.8 38.8 15.3 26.5
10,000 - 49,999 lbs S S S S S S 263 S S S S S S 43.9
50,000 - 99,999 lbs 21 1.2 S S S S S 45.4 4.5 S S S S S
More than 100,000 lbs S S 22 2.5 S S 1,145 S S 46.2 6.5 S S 33.3

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.