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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 Size for Metropolitan Area of Origin: 2007

Tuesday, July 3, 2012

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 41,027 100 82,253 100 19,336 100 144 15.8 - 19.5 - 15.5 - 22.1
Less than 50 lbs 527 1.3 20 - 3 - 179 15.8 0.5 19.5 - 19.6 - 35.5
50 - 99 lbs 134 0.3 17 - 2 - 95 17.3 0.2 30.8 - 37.5 - 20.4
100 - 499 lbs 451 1.1 111 0.1 7 - S 18.3 0.7 30.1 0.1 15.9 0.1 S
500 - 749 lbs 138 0.3 72 0.1 4 - 59 19.4 0.2 23.7 0.1 22.7 - 33.7
750 - 999 lbs 106 0.3 36 - 5 - 125 20.4 0.1 18.3 - 36.4 0.1 21.8
1,000 - 9,999 lbs 1,292 3.1 718 0.9 71 0.4 109 19.7 2.0 21.9 0.5 27.3 1.0 31.9
10,000 - 49,999 lbs 3,284 8.0 8,948 10.9 973 5.0 112 18.6 3.2 19.6 2.1 19.2 3.6 19.6
50,000 - 99,999 lbs 1,511 3.7 7,220 8.8 696 3.6 104 41.4 1.1 39.4 6.6 33.4 1.3 26.5
More than 100,000 lbs 33,585 81.9 65,111 79.2 17,576 90.9 491 18.6 6.5 22.9 7.3 16.8 5.7 24.3

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 32,953 100 67,921 100 14,372 100 71 17.4 - 19.9 - 16.9 - 23.4
Less than 50 lbs 294 0.9 16 - 1 - 52 21.7 0.4 24.8 - 23.7 - 35.7
50 - 99 lbs 86 0.3 15 - 1 - 46 17.3 0.1 33.8 - 21.5 - 39.7
100 - 499 lbs 365 1.1 107 0.2 6 - S 20.3 0.5 31.1 0.1 14.9 0.1 S
500 - 749 lbs 133 0.4 72 0.1 4 - 59 20.7 0.2 24.2 0.1 23.3 0.1 34.0
750 - 999 lbs 106 0.3 36 0.1 5 - 125 20.4 0.1 18.3 - 36.4 0.1 21.8
1,000 - 9,999 lbs 1,288 3.9 713 1.0 70 0.5 109 19.8 2.3 22.2 0.5 27.3 1.1 31.9
10,000 - 49,999 lbs 3,244 9.8 8,563 12.6 953 6.6 115 18.8 3.7 18.4 2.3 19.9 3.8 18.7
50,000 - 99,999 lbs 1,497 4.5 7,162 10.5 684 4.8 103 41.0 1.4 39.6 7.3 33.9 1.6 26.9
More than 100,000 lbs 25,941 78.7 51,239 75.4 12,649 88.0 576 20.5 6.9 24.3 8.0 18.4 6.0 23.6

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 7,663 100 20,095 100 1,859 100 65 16.4 - 18.6 - 22.7 - 18.8
Less than 50 lbs 291 3.8 16 0.1 1 - 50 22.0 3.3 24.9 0.2 24.2 - 24.9
50 - 99 lbs 84 1.1 14 0.1 1 - 42 17.4 0.2 33.2 0.1 20.8 - 42.0
100 - 499 lbs 364 4.8 107 0.5 6 0.3 S 20.3 0.7 31.1 0.5 15.2 0.5 S
500 - 749 lbs 133 1.7 72 0.4 4 0.2 59 20.7 0.5 24.2 0.3 23.3 0.4 34.0
750 - 999 lbs 106 1.4 36 0.2 5 0.2 125 20.4 0.4 18.3 0.2 36.4 0.3 21.8
1,000 - 9,999 lbs 1,287 16.8 712 3.5 70 3.8 109 19.8 2.9 22.2 1.7 27.3 1.7 31.9
10,000 - 49,999 lbs 3,227 42.1 8,552 42.6 950 51.1 115 19.0 3.6 18.5 7.2 20.1 4.3 19.0
50,000 - 99,999 lbs 1,488 19.4 7,140 35.5 683 36.7 103 41.3 4.7 39.7 8.9 33.9 7.2 26.7
More than 100,000 lbs 681 8.9 S S S S S 37.5 5.6 S S S S 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 3,298 100 10,582 100 1,218 100 216 23.7 - 32.9 - 26.4 - 35.0
Less than 50 lbs 27 0.8 S S - - 314 24.7 0.1 S S 30.6 - 27.0
50 - 99 lbs 19 0.6 S S - - S 36.9 0.2 S S 30.6 - S
100 - 499 lbs 105 3.2 10 0.1 2 0.2 215 30.5 0.6 47.8 0.1 38.8 0.2 48.1
500 - 749 lbs 18 0.5 S S S S S 30.9 0.3 S S S S S
750 - 999 lbs 41 1.3 4 - S S 559 29.3 0.4 32.4 0.1 S S 26.1
1,000 - 9,999 lbs 418 12.7 203 1.9 28 2.3 S 25.1 4.4 42.3 1.8 30.9 2.4 S
10,000 - 49,999 lbs 1,373 41.6 3,256 30.8 598 49.1 S 26.3 7.1 30.4 9.5 24.5 5.3 S
50,000 - 99,999 lbs 841 25.5 S S 539 44.3 113 36.5 6.6 S S 38.3 8.9 36.2
More than 100,000 lbs 458 13.9 S S 47 3.9 S 43.3 6.2 S S 40.8 3.2 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 4,365 100 9,513 100 641 100 36 22.6 - 18.5 - 33.5 - 17.9
Less than 50 lbs 265 6.1 15 0.2 - - 20 24.6 4.8 27.2 0.3 22.8 - 19.4
50 - 99 lbs 65 1.5 13 0.1 - 0.1 27 21.2 0.2 33.5 0.1 30.9 - 24.7
100 - 499 lbs 260 6.0 97 1.0 4 0.6 38 21.3 1.3 31.5 0.7 26.3 0.9 35.0
500 - 749 lbs 116 2.6 67 0.7 3 0.5 48 24.8 0.7 24.6 0.5 29.6 0.9 36.4
750 - 999 lbs 64 1.5 32 0.3 2 0.4 72 22.7 0.4 19.9 0.3 28.0 0.6 20.0
1,000 - 9,999 lbs 870 19.9 509 5.3 42 6.6 88 27.4 4.6 19.6 2.2 38.2 4.1 17.9
10,000 - 49,999 lbs 1,855 42.5 5,296 55.7 351 54.8 77 30.6 5.8 15.0 7.3 35.7 6.2 19.2
50,000 - 99,999 lbs S S 1,861 19.6 144 22.4 75 S S 41.0 6.1 38.9 6.0 24.5
More than 100,000 lbs S S S S S S 129 S S S S S S 35.3

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 976 100 2,302 100 2,904 100 1,235 16.8 - 26.5 - 33.1 - 12.7
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 963 98.7 2,299 99.9 2,901 99.9 1,234 16.8 1.0 26.5 0.1 33.1 0.1 12.8

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 4,053 100 8,558 100 S S S 36.8 - 33.6 - 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 4,053 100.0 8,558 100.0 S S S 36.8 - 33.6 - 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

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 2,623 100 5,611 100 S S 399 20.9 - 25.6 - S S 44.6
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 2,623 100.0 5,611 100.0 S S 399 20.9 - 25.6 - S S 44.6

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 S S S S - 100 1,109 S S S S 2.9 - 3.7
Less than 50 lbs S S S S S S 1,052 S S S S S S 15.9
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 - - - - - - - - - - - - - -
10,000 - 49,999 lbs - - - - - - - - - - - - - -
50,000 - 99,999 lbs S S S S S S S S S S S S S S
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 20,256 100 36,965 100 S S S 23.7 - 29.6 - S S 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 - - - - - - - - - - - - - -
750 - 999 lbs - - - - - - - - - - - - - -
1,000 - 9,999 lbs - - 1 - S S S 30.5 0.7 48.2 0.7 S S S
10,000 - 49,999 lbs 4 - 9 - S S S 43.8 3.5 43.8 1.9 S S S
50,000 - 99,999 lbs 8 - 20 0.1 S S S 39.7 0.1 42.0 0.1 S S S
More than 100,000 lbs 20,244 99.9 36,935 99.9 S S S 23.7 1.5 29.6 0.9 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 8,012 100 13,990 100 4,954 100 800 31.6 - 36.9 - 30.2 - 12.8
Less than 50 lbs 207 2.6 2 - 2 - 826 23.1 7.0 22.4 0.2 23.5 1.2 13.5
50 - 99 lbs 45 0.6 1 - S S 802 39.5 1.5 43.1 0.2 S S 17.9
100 - 499 lbs 80 1.0 2 - 1 - 546 41.5 3.0 27.8 0.2 32.7 0.8 14.3
500 - 749 lbs S S - - - - S S S 48.7 - 39.7 - S
750 - 999 lbs - - - - - - - - - - - - - -
1,000 - 9,999 lbs - - - - - - - - - - - - - -
10,000 - 49,999 lbs S S S S S S 202 S S S S S S 34.3
50,000 - 99,999 lbs S S S S S S S S S S S S S S
More than 100,000 lbs 7,643 95.4 13,870 99.1 4,927 99.4 198 33.3 11.0 37.2 0.9 30.4 3.7 35.5

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 336 100 6 100 4 100 818 21.7 - 23.0 - 27.9 - 12.5
Less than 50 lbs 207 61.4 2 43.1 2 50.2 826 23.1 7.7 22.4 7.0 23.5 7.2 13.5
50 - 99 lbs 45 13.4 1 18.4 S S 802 39.5 7.0 43.1 3.6 S S 17.9
100 - 499 lbs 80 23.8 2 34.0 1 26.5 561 41.5 6.5 30.4 6.9 33.1 6.9 22.0
500 - 749 lbs S S - 4.4 - 2.5 S S S 48.7 6.7 39.7 3.3 S
750 - 999 lbs - - - - - - - - - - - - - -
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 133 100 S S 158 100 S 34.2 - S S 34.1 - 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 - - - - - - - - - - - - - -
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 105 78.8 S S 135 85.4 S 41.8 11.2 S S 40.8 10.2 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 S S S S S S 226 S S S S S S 10.4
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 S S S S S S 226 S S S S S S 10.4

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 287 100 437 100 371 100 1,126 44.2 - 36.3 - 50.0 - 36.2
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 287 100.0 437 100.0 371 100.0 1,126 44.2 - 36.3 - 50.0 - 36.2

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 5,340 100 8,461 100 3,554 100 549 31.1 - 25.6 - 23.1 - 27.4
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 S S S S S S 245 S S S S S S 5.9
50,000 - 99,999 lbs - - - - - - - - - - - - - -
More than 100,000 lbs 5,336 99.9 8,460 100.0 3,553 100.0 563 28.7 - 22.5 - 19.6 - 29.5

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 61 100 S S S S S 37.0 - S S S S S
Less than 50 lbs 27 43.8 2 0.5 - 0.3 S 34.0 12.7 33.0 11.4 34.4 6.8 S
50 - 99 lbs S S 1 0.3 - 0.5 50 S S 34.4 12.1 46.9 16.2 23.1
100 - 499 lbs S S 1 0.4 S S 66 S S 39.7 7.4 S S 43.6
500 - 749 lbs - 0.3 S S - 0.1 S 27.6 0.7 S S 31.7 2.1 S
750 - 999 lbs - 0.1 - - - - 227 23.7 0.9 2.1 0.5 1.4 0.6 3.6
1,000 - 9,999 lbs 4 6.6 S S - 4.1 S 22.7 17.5 S S 34.2 18.9 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 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.