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 169,772 100 356,091 100 102,551 100 528 19.0 - 11.6 - 14.2 - 8.8
Less than 50 lbs 7,771 4.6 161 - 96 0.1 663 7.2 0.7 18.5 - 21.0 - 8.7
50 - 99 lbs 2,363 1.4 83 - 29 - 355 16.8 0.3 8.9 - 19.1 - 10.0
100 - 499 lbs 6,572 3.9 571 0.2 186 0.2 338 14.3 0.6 12.9 - 17.7 0.1 11.0
500 - 749 lbs 2,527 1.5 324 0.1 94 0.1 294 18.3 0.3 6.2 - 11.5 - 14.4
750 - 999 lbs 1,769 1.0 322 0.1 84 0.1 255 17.9 0.2 12.4 - 18.8 - 18.7
1,000 - 9,999 lbs 25,794 15.2 6,549 1.8 1,959 1.9 296 9.5 1.9 7.4 0.3 10.9 0.5 10.6
10,000 - 49,999 lbs 89,209 52.5 80,388 22.6 16,497 16.1 208 30.2 3.9 9.0 1.7 14.7 2.9 13.7
50,000 - 99,999 lbs 10,010 5.9 48,785 13.7 2,227 2.2 44 19.8 0.8 14.5 2.6 11.6 0.3 13.7
More than 100,000 lbs 23,759 14.0 218,909 61.5 81,379 79.4 389 31.2 3.9 15.6 3.8 18.0 3.5 6.7

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 154,720 100 336,454 100 89,146 100 233 20.9 - 12.5 - 15.6 - 6.4
Less than 50 lbs 2,406 1.6 35 - 9 - 295 22.9 0.3 10.4 - 10.5 - 19.5
50 - 99 lbs 1,355 0.9 47 - 9 - 197 25.7 0.3 10.4 - 11.5 - 7.8
100 - 499 lbs 5,320 3.4 494 0.1 115 0.1 235 15.1 0.6 13.5 - 11.2 - 10.1
500 - 749 lbs 2,308 1.5 296 0.1 72 0.1 245 19.4 0.3 7.1 - 12.5 - 15.2
750 - 999 lbs 1,641 1.1 309 0.1 76 0.1 241 19.0 0.4 12.0 - 20.1 - 20.4
1,000 - 9,999 lbs 24,319 15.7 6,333 1.9 1,666 1.9 255 11.1 2.1 7.6 0.4 8.1 0.5 8.7
10,000 - 49,999 lbs 85,037 55.0 78,694 23.4 15,385 17.3 197 30.8 3.9 8.9 2.2 15.1 3.6 13.7
50,000 - 99,999 lbs 9,980 6.5 48,430 14.4 2,192 2.5 44 19.8 0.9 14.4 2.9 12.0 0.4 14.0
More than 100,000 lbs 22,354 14.4 201,816 60.0 69,622 78.1 352 33.8 4.2 17.3 4.6 20.0 4.3 7.7

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 113,909 100 161,061 100 19,033 100 206 12.1 - 12.4 - 7.3 - 3.5
Less than 50 lbs 2,325 2.0 34 - 8 - 222 24.4 0.3 10.8 - 19.3 - 12.3
50 - 99 lbs 1,343 1.2 47 - 9 - 190 26.0 0.3 10.8 - 12.9 - 8.2
100 - 499 lbs 5,281 4.6 492 0.3 111 0.6 228 15.1 0.5 13.4 0.1 9.9 0.1 10.9
500 - 749 lbs 2,296 2.0 296 0.2 71 0.4 244 19.2 0.3 7.1 - 12.6 0.1 15.2
750 - 999 lbs 1,379 1.2 301 0.2 60 0.3 197 10.4 0.1 12.7 - 10.2 - 7.6
1,000 - 9,999 lbs 24,239 21.3 6,324 3.9 1,655 8.7 253 11.1 1.7 7.6 0.6 7.9 0.7 8.7
10,000 - 49,999 lbs 65,702 57.7 76,752 47.7 13,325 70.0 180 12.8 2.0 9.5 4.9 6.9 3.5 10.2
50,000 - 99,999 lbs 9,625 8.4 47,775 29.7 2,082 10.9 43 19.4 0.9 14.3 3.9 11.6 1.0 14.8
More than 100,000 lbs 1,720 1.5 S S S S 95 23.4 0.3 S S S S 33.4

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 69,512 100 94,704 100 14,740 100 339 8.7 - 22.0 - 8.3 - 8.6
Less than 50 lbs 1,774 2.6 14 - 5 - 321 32.9 0.6 16.4 - 20.4 - 13.4
50 - 99 lbs 853 1.2 16 - 5 - 336 40.3 0.4 21.4 - 22.6 - 15.1
100 - 499 lbs 3,274 4.7 179 0.2 81 0.5 463 22.7 0.7 16.3 - 12.0 0.1 12.0
500 - 749 lbs 1,495 2.2 110 0.1 52 0.4 486 29.1 0.4 18.2 - 16.0 0.1 15.0
750 - 999 lbs 792 1.1 86 0.1 37 0.3 428 14.0 0.2 16.4 - 16.4 - 11.6
1,000 - 9,999 lbs 13,551 19.5 2,221 2.3 1,082 7.3 500 7.0 1.0 2.7 0.5 8.8 0.6 6.0
10,000 - 49,999 lbs 42,516 61.2 38,915 41.1 10,435 70.8 283 8.2 1.9 11.8 5.8 7.3 4.0 10.8
50,000 - 99,999 lbs 3,922 5.6 26,640 28.1 1,433 9.7 53 14.3 0.8 16.0 4.1 11.8 1.1 20.2
More than 100,000 lbs 1,336 1.9 S S S S 114 24.0 0.4 S S S S 45.7

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 44,396 100 66,357 100 4,293 100 109 20.6 - 10.0 - 11.1 - 13.1
Less than 50 lbs 551 1.2 19 - 2 0.1 132 17.4 0.3 8.9 - 19.6 - 18.0
50 - 99 lbs 490 1.1 31 - 3 0.1 111 30.5 0.4 13.3 - 14.9 - 16.9
100 - 499 lbs 2,008 4.5 313 0.5 30 0.7 99 13.4 1.1 15.8 0.1 10.4 0.1 17.1
500 - 749 lbs 800 1.8 187 0.3 19 0.4 103 7.0 0.3 10.9 - 9.9 0.1 16.7
750 - 999 lbs 586 1.3 215 0.3 23 0.5 106 11.8 0.3 13.9 0.1 20.7 0.1 20.9
1,000 - 9,999 lbs 10,688 24.1 4,103 6.2 573 13.3 137 19.7 3.4 11.1 0.9 14.3 1.3 15.6
10,000 - 49,999 lbs 23,186 52.2 37,837 57.0 2,889 67.3 86 25.1 3.7 8.7 4.5 12.0 2.3 17.8
50,000 - 99,999 lbs 5,702 12.8 21,135 31.8 650 15.1 31 28.2 1.6 27.6 5.2 15.5 1.7 39.3
More than 100,000 lbs S S 2,518 3.8 103 2.4 S S S 46.4 2.1 30.9 0.9 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 S S 125,895 100 63,493 100 690 S S 18.8 - 19.7 - 14.3
Less than 50 lbs S S S S S S S S S S S S S S
50 - 99 lbs - - - - - - - - - - - - - -
100 - 499 lbs - - - - - - - - - - - - - -
500 - 749 lbs - - - - - - - - - - - - - -
750 - 999 lbs - - - - - - - - - - - - - -
1,000 - 9,999 lbs 11 - 2 - S S 1,070 35.5 0.7 43.5 - S S 16.7
10,000 - 49,999 lbs S S S S S S 1,049 S S S S S S 20.1
50,000 - 99,999 lbs S S 601 0.5 109 0.2 183 S S 36.4 0.3 41.8 0.1 38.2
More than 100,000 lbs 9,508 32.8 123,360 98.0 61,330 96.6 481 11.5 19.1 19.3 1.3 20.2 2.1 7.9

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 2,060 100 34,385 100 6,480 100 241 33.4 - 36.6 - 35.0 - 26.3
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 1,120 S S S S S S 9.0
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 2,053 99.6 34,379 100.0 6,478 100.0 219 33.3 0.1 36.6 - 35.0 - 30.1

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 2,060 100 34,385 100 6,480 100 241 33.4 - 36.6 - 35.0 - 26.3
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 1,120 S S S S S S 9.0
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 2,053 99.6 34,379 100.0 6,478 100.0 219 33.3 0.1 36.6 - 35.0 - 30.1

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 642 100 27 100 37 100 1,594 42.8 - 38.6 - 42.1 - 12.2
Less than 50 lbs 81 12.6 1 4.4 1 3.5 1,584 23.7 14.3 25.5 9.0 31.2 11.9 14.7
50 - 99 lbs 12 1.8 S S S S 913 37.6 1.0 S S S S 13.4
100 - 499 lbs 39 6.1 2 7.9 S S 1,829 33.8 6.7 32.0 9.5 S S 20.3
500 - 749 lbs S S - 0.7 - 0.8 1,556 S S 34.5 2.2 47.4 3.2 19.8
750 - 999 lbs S S S S S S 2,028 S S S S S S 33.4
1,000 - 9,999 lbs 66 10.3 S S S S 1,638 40.3 15.5 S S S S 21.0
10,000 - 49,999 lbs S S S S S S 774 S S S S S S 15.5
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 - - - - - - - - - - - - - -
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 11,789 100 18,115 100 13,239 100 770 10.3 - 19.1 - 17.8 - 6.6
Less than 50 lbs 5,247 44.5 122 0.7 87 0.7 764 15.8 6.1 22.4 0.7 22.6 0.3 6.6
50 - 99 lbs 974 8.3 32 0.2 19 0.1 623 25.4 1.9 23.4 0.3 28.9 0.2 9.5
100 - 499 lbs 1,156 9.8 62 0.3 67 0.5 998 21.4 2.4 22.3 0.6 40.2 0.5 15.7
500 - 749 lbs 185 1.6 17 0.1 21 0.2 1,313 42.4 0.7 23.0 0.2 37.3 0.2 21.2
750 - 999 lbs S S 7 - S S 1,030 S S 36.9 0.1 S S 29.8
1,000 - 9,999 lbs S S S S S S 2,602 S S S S S S 12.0
10,000 - 49,999 lbs 2,207 18.7 541 3.0 1,024 7.7 1,962 48.2 6.1 21.7 1.6 24.7 2.7 14.8
50,000 - 99,999 lbs S S S S 33 0.2 S S S S S 21.6 0.1 S
More than 100,000 lbs 1,405 11.9 17,069 94.2 11,751 88.8 617 24.6 2.3 20.0 3.3 18.3 3.8 10.0

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 7,563 100 224 100 163 100 760 10.7 - 15.4 - 15.4 - 6.2
Less than 50 lbs 5,247 69.4 122 54.5 87 53.2 764 15.8 6.5 22.4 5.9 22.6 7.4 6.6
50 - 99 lbs 974 12.9 32 14.2 19 11.8 623 25.4 2.4 23.4 1.8 28.9 2.0 9.5
100 - 499 lbs 1,104 14.6 51 22.9 39 24.0 729 23.1 4.3 21.5 4.1 25.7 4.8 9.6
500 - 749 lbs 170 2.2 14 6.2 15 9.3 1,110 46.1 1.0 25.0 1.5 32.4 2.8 32.8
750 - 999 lbs S S 5 2.3 S S 516 S S 48.1 1.4 S S 28.3
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 2,583 100 S S 2,059 100 2,189 38.3 - S S 35.4 - 9.7
Less than 50 lbs - - - - - - - - - - - - - -
50 - 99 lbs - - - - - - - - - - - - - -
100 - 499 lbs S S S S S S 2,557 S S S S S S 5.6
500 - 749 lbs 15 0.6 S S S S 2,370 45.0 1.1 S S S S 18.9
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 2,561 S S S S S S 15.1
10,000 - 49,999 lbs S S 475 18.6 794 38.6 1,650 S S 24.5 11.8 25.5 11.7 12.9
50,000 - 99,999 lbs S S S S 29 1.4 S S S S S 23.9 1.6 S
More than 100,000 lbs 392 15.2 S S S S 562 30.8 8.3 S S S S 13.3

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 7,579 100 5,909 100 2,741 S S 33.7 - 33.6 - 22.6
Less than 50 lbs - - - - - - - - - - - - - -
50 - 99 lbs - - - - - - - - - - - - - -
100 - 499 lbs S S - - S S 4,866 S S 36.4 13.3 S S 45.5
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 S S S S S S 3,397 S S S S S S 27.0
10,000 - 49,999 lbs S S S S S S 5,463 S S S S S S 26.5
50,000 - 99,999 lbs - - - - - - - - - - - - - -
More than 100,000 lbs S S 7,547 99.6 5,765 97.6 762 S S 21.0 1.1 22.6 5.4 5.0

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 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 3,258 99.5 S S S S S 39.5 0.3 S S S

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 860 100 4,486 100 4,255 100 1,624 49.2 - 45.4 - 45.1 - 19.8
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 1,010 S S S S S S 10.7
10,000 - 49,999 lbs S S S S S S 2,406 S S S S S S 45.3
50,000 - 99,999 lbs - - - - - - - - - - - - - -
More than 100,000 lbs 675 78.5 4,440 99.0 4,119 96.8 938 40.7 9.0 33.5 0.9 33.6 1.3 3.9

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 S S 1,522 100 167 100 S S S 46.2 - 36.9 - S
Less than 50 lbs S S 4 0.3 - 0.1 S S S 46.2 0.5 45.4 0.2 S
50 - 99 lbs 34 1.1 S S S S S 38.0 2.5 S S S S S
100 - 499 lbs 95 2.9 15 1.0 S S S 27.9 6.5 34.3 3.0 S S S
500 - 749 lbs 34 1.0 11 0.7 - 0.2 35 41.9 1.9 46.5 1.8 39.4 0.4 40.0
750 - 999 lbs S S S S - 0.2 S S S S S 33.2 1.1 S
1,000 - 9,999 lbs S S 133 8.7 S S 453 S S 27.7 6.8 S S 22.8
10,000 - 49,999 lbs S S S S 87 52.1 S S S S S 37.3 6.4 S
50,000 - 99,999 lbs S S 172 11.3 S S S S S 35.3 6.8 S S S
More than 100,000 lbs - - S S 6 3.4 S 0.2 0.1 S S 46.0 20.0 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.