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 126,797 100 157,356 100 15,487 100 512 4.9 - 12.5 - 22.6 - 10.5
Less than 50 lbs 20,143 15.9 304 0.2 140 0.9 688 14.8 2.6 15.2 0.1 16.7 0.5 11.4
50 - 99 lbs 5,093 4.0 207 0.1 61 0.4 298 14.3 0.6 11.1 0.1 16.0 0.2 17.1
100 - 499 lbs 16,586 13.1 1,460 0.9 263 1.7 194 10.2 1.1 14.4 0.4 12.8 0.6 8.5
500 - 749 lbs 4,919 3.9 751 0.5 128 0.8 172 12.8 0.4 11.8 0.1 16.6 0.3 18.4
750 - 999 lbs 4,926 3.9 697 0.4 129 0.8 181 15.2 0.6 12.2 0.1 14.0 0.2 42.5
1,000 - 9,999 lbs 30,017 23.7 8,989 5.7 1,715 11.1 175 8.2 1.2 14.0 1.3 12.0 1.5 14.2
10,000 - 49,999 lbs 30,095 23.7 105,348 66.9 6,162 39.8 68 9.3 1.6 17.9 5.8 14.3 5.2 14.5
50,000 - 99,999 lbs 12,635 10.0 27,996 17.8 1,314 8.5 47 19.9 1.8 22.4 4.3 19.3 2.1 18.4
More than 100,000 lbs 2,381 1.9 11,603 7.4 S S 580 35.5 0.8 26.1 1.5 S S 20.9

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 100,859 100 147,669 100 10,517 100 154 8.4 - 11.8 - 10.6 - 13.6
Less than 50 lbs 6,323 6.3 172 0.1 31 0.3 179 8.5 0.8 16.5 - 21.4 0.1 25.7
50 - 99 lbs 2,900 2.9 153 0.1 20 0.2 130 18.2 0.6 11.7 - 13.9 - 14.0
100 - 499 lbs 13,122 13.0 1,266 0.9 176 1.7 140 12.6 1.4 13.9 0.4 13.3 0.4 10.4
500 - 749 lbs 4,264 4.2 696 0.5 112 1.1 162 12.7 0.7 11.5 0.1 16.4 0.3 20.1
750 - 999 lbs 4,735 4.7 688 0.5 127 1.2 180 15.0 1.1 12.1 0.1 14.6 0.2 42.9
1,000 - 9,999 lbs 28,641 28.4 8,615 5.8 1,647 15.7 175 8.6 1.0 14.7 1.2 12.7 1.2 14.3
10,000 - 49,999 lbs 27,666 27.4 102,492 69.4 5,897 56.1 68 11.6 2.0 17.6 6.3 13.0 3.9 15.6
50,000 - 99,999 lbs 12,370 12.3 27,913 18.9 1,269 12.1 46 20.0 2.0 22.4 4.3 20.0 1.9 16.7
More than 100,000 lbs 839 0.8 5,673 3.8 1,238 11.8 212 24.2 0.2 30.3 1.1 34.2 3.1 45.7

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 97,525 100 144,844 100 9,331 100 125 8.7 - 11.9 - 10.3 - 14.7
Less than 50 lbs 4,996 5.1 167 0.1 23 0.2 121 8.7 0.7 17.0 - 23.9 0.1 29.5
50 - 99 lbs 2,695 2.8 151 0.1 17 0.2 114 19.2 0.6 11.5 - 13.8 - 13.8
100 - 499 lbs 12,378 12.7 1,257 0.9 163 1.7 131 13.5 1.4 14.1 0.4 15.0 0.4 9.2
500 - 749 lbs 4,248 4.4 696 0.5 112 1.2 162 12.6 0.7 11.5 0.1 16.4 0.3 20.1
750 - 999 lbs 4,371 4.5 680 0.5 123 1.3 177 17.2 1.2 12.2 0.1 15.6 0.3 43.9
1,000 - 9,999 lbs 28,447 29.2 8,598 5.9 1,636 17.5 174 8.7 1.1 14.8 1.2 12.9 1.7 14.6
10,000 - 49,999 lbs 27,458 28.2 102,381 70.7 5,892 63.1 68 11.6 2.1 17.6 6.2 13.0 3.5 15.6
50,000 - 99,999 lbs 12,369 12.7 27,897 19.3 1,267 13.6 46 20.0 2.1 22.5 4.5 20.1 2.2 16.7
More than 100,000 lbs 563 0.6 3,018 2.1 S S 39 31.2 0.2 37.3 0.8 S S 47.1

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 36,840 100 47,815 100 6,397 100 581 10.6 - 22.6 - 15.2 - 17.1
Less than 50 lbs 1,448 3.9 25 0.1 19 0.3 631 25.8 0.8 28.6 - 28.7 0.1 26.7
50 - 99 lbs 503 1.4 19 - 13 0.2 686 23.4 0.5 19.0 - 18.5 0.1 21.6
100 - 499 lbs 2,833 7.7 142 0.3 117 1.8 836 14.1 1.2 15.1 0.3 17.4 0.6 7.9
500 - 749 lbs 1,297 3.5 111 0.2 82 1.3 759 23.4 0.6 28.8 0.1 20.1 0.5 19.1
750 - 999 lbs 1,988 5.4 95 0.2 95 1.5 985 38.1 2.7 18.5 0.2 21.9 0.6 11.4
1,000 - 9,999 lbs 11,628 31.6 1,723 3.6 1,306 20.4 802 12.9 2.5 18.7 1.6 14.1 2.3 6.7
10,000 - 49,999 lbs 12,286 33.4 32,123 67.2 4,057 63.4 162 16.4 3.4 28.1 6.0 19.2 4.1 38.2
50,000 - 99,999 lbs 4,686 12.7 12,715 26.6 686 10.7 53 24.9 2.4 31.0 5.2 29.8 2.5 30.5
More than 100,000 lbs S S 863 1.8 22 0.3 S S S 41.1 0.7 31.5 0.1 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 60,685 100 97,029 100 2,935 100 32 11.6 - 12.1 - 14.6 - 8.5
Less than 50 lbs 3,548 5.8 142 0.1 4 0.1 22 11.1 1.1 20.4 - 15.4 - 22.6
50 - 99 lbs 2,191 3.6 132 0.1 4 0.1 34 22.0 0.8 12.1 - 11.2 - 15.6
100 - 499 lbs 9,545 15.7 1,115 1.1 46 1.6 40 14.7 1.9 14.7 0.5 13.4 0.4 10.6
500 - 749 lbs 2,951 4.9 585 0.6 30 1.0 51 16.1 1.0 12.0 0.2 20.5 0.2 12.4
750 - 999 lbs 2,383 3.9 586 0.6 29 1.0 49 17.9 0.5 14.4 0.2 18.7 0.2 15.1
1,000 - 9,999 lbs 16,819 27.7 6,875 7.1 330 11.3 47 11.7 2.8 15.0 1.8 15.0 2.3 21.4
10,000 - 49,999 lbs 15,172 25.0 70,258 72.4 1,835 62.5 28 16.0 2.1 17.3 6.2 18.1 5.9 27.8
50,000 - 99,999 lbs 7,683 12.7 15,182 15.6 581 19.8 39 31.3 3.1 29.2 4.4 24.7 4.5 24.0
More than 100,000 lbs 393 0.6 2,155 2.2 S S 40 41.5 0.3 37.0 1.4 S S 26.5

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 426 100 2,761 100 1,147 100 433 48.8 - 35.2 - 35.5 - 40.3
Less than 50 lbs S S - - S S S S S 22.2 - 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 10 S S S S S S 49.9
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 88 3.2 S S S S S 38.1 10.5 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 2,654 96.1 1,141 99.5 S S S 36.5 3.3 35.5 1.4 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 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 - - - - - - - - - - - - - -
More than 100,000 lbs - - - - - - - - - - - - - -

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

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

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 2,863 100 43 100 39 100 1,412 21.3 - 29.3 - 28.0 - 10.9
Less than 50 lbs 1,321 46.1 5 12.8 8 20.8 1,463 27.8 5.4 25.3 6.9 30.1 8.3 11.9
50 - 99 lbs 204 7.1 2 5.3 2 5.8 1,034 24.4 2.0 41.5 2.1 33.8 3.0 28.8
100 - 499 lbs 743 26.0 9 20.6 13 33.6 1,369 30.8 3.8 29.4 5.9 44.8 10.5 19.9
500 - 749 lbs S S - 0.6 S S 1,242 S S 40.6 1.9 S S 18.5
750 - 999 lbs S S 8 19.1 S S S S S 49.7 5.1 S S S
1,000 - 9,999 lbs 185 6.5 S S S S 938 31.3 2.9 S S S S 24.9
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

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 20,408 100 6,248 100 S S 1,151 17.7 - 49.9 - S S 4.5
Less than 50 lbs 12,892 63.2 106 1.7 108 2.3 1,163 21.2 4.3 22.0 3.8 22.8 6.0 4.5
50 - 99 lbs 1,932 9.5 40 0.6 40 0.9 1,010 18.9 1.7 19.9 2.1 24.4 2.8 8.9
100 - 499 lbs 2,597 12.7 95 1.5 81 1.7 929 16.3 1.2 22.8 5.7 25.7 5.7 11.3
500 - 749 lbs 318 1.6 9 0.1 12 0.2 1,283 47.0 1.7 22.5 0.3 41.9 0.7 24.2
750 - 999 lbs S S 1 - S S 1,009 S S 22.4 0.1 S S 40.6
1,000 - 9,999 lbs 533 2.6 62 1.0 S S S 29.6 0.7 32.4 4.3 S S S
10,000 - 49,999 lbs 593 2.9 147 2.4 104 2.2 463 40.6 0.8 27.8 2.3 46.3 2.2 32.5
50,000 - 99,999 lbs S S 60 1.0 S S 589 S S 34.5 7.7 S S 32.4
More than 100,000 lbs S S S S S S 891 S S S S S S 18.6

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 17,696 100 246 100 241 100 1,153 18.3 - 19.8 - 22.8 - 4.5
Less than 50 lbs 12,881 72.8 106 43.0 108 45.0 1,163 21.2 3.1 22.1 3.5 22.8 2.7 4.5
50 - 99 lbs 1,930 10.9 40 16.1 40 16.7 1,015 18.9 1.5 20.3 2.4 24.6 3.1 9.1
100 - 499 lbs 2,556 14.4 93 37.7 80 33.4 939 16.3 1.2 23.5 4.2 26.0 3.5 11.7
500 - 749 lbs S S 7 2.9 11 4.4 1,509 S S 27.8 0.6 47.3 1.2 21.8
750 - 999 lbs S S 1 0.3 S S 1,883 S S 39.9 0.9 S S 23.1
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 S S S S 889 S S S S S S 20.0
Less than 50 lbs S S S S S S 1,564 S S S S S S 10.4
50 - 99 lbs 1 0.1 S S S S S 32.2 3.8 S S S S S
100 - 499 lbs S S 1 - S S S S S 23.6 0.1 S S S
500 - 749 lbs 6 0.4 1 - S S S 12.6 3.1 44.9 0.3 S S S
750 - 999 lbs S S - - S S S S S 1.3 0.4 S S S
1,000 - 9,999 lbs 241 14.1 S S S S S 35.5 11.6 S S S S S
10,000 - 49,999 lbs S S 58 1.0 S S S S S 42.4 1.4 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 889 S S S S S S 19.2

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 992 100 382 100 S S S 27.9 - 36.8 - S S S
Less than 50 lbs 1 0.1 S S S S 206 32.9 0.2 S S S S 36.3
50 - 99 lbs S S S S S S S S S S S S S S
100 - 499 lbs 25 2.5 S S S S S 46.2 2.1 S S S S S
500 - 749 lbs S S S S S S 134 S S S S S S 49.7
750 - 999 lbs S S S S S S S S S S S S S S
1,000 - 9,999 lbs 292 29.5 50 13.1 S S S 32.6 11.7 42.7 12.7 S S S
10,000 - 49,999 lbs 268 27.0 88 23.0 42 13.3 338 19.7 8.2 23.5 9.5 40.5 8.3 43.7
50,000 - 99,999 lbs S S 43 11.3 17 5.5 S S S 41.6 9.5 34.2 15.5 S
More than 100,000 lbs S S S S S S 1,061 S S S S S S 18.0

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

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

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 5,530 100 S S S S 82 32.4 - S S S S 27.3
Less than 50 lbs 929 16.8 S S S S 88 45.9 2.7 S S S S 33.9
50 - 99 lbs 262 4.7 15 0.4 S S 61 49.5 1.0 35.0 0.7 S S 35.2
100 - 499 lbs 867 15.7 99 2.9 S S S 35.9 2.5 30.9 3.2 S S S
500 - 749 lbs 338 6.1 46 1.3 S S 92 32.5 2.4 38.0 2.0 S S 31.9
750 - 999 lbs S S 7 0.2 S S S S S 34.1 0.6 S S S
1,000 - 9,999 lbs 843 15.2 312 9.1 29 9.2 S 37.0 4.0 40.0 8.3 33.0 14.0 S
10,000 - 49,999 lbs 1,836 33.2 S S S S 52 38.0 7.6 S S S S 21.7
50,000 - 99,999 lbs S S S S S S S S S S S S S S
More than 100,000 lbs S S S S S S 723 S S S S S S 42.9

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.