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 156,415 100 168,595 100 31,972 100 462 5.3 - 9.0 - 5.3 - 9.7
Less than 50 lbs 9,629 6.2 281 0.2 103 0.3 564 15.8 0.9 12.5 - 14.8 - 11.7
50 - 99 lbs 3,426 2.2 230 0.1 67 0.2 272 23.8 0.5 21.8 - 16.4 - 18.3
100 - 499 lbs 18,291 11.7 906 0.5 324 1.0 356 28.2 2.9 7.9 0.1 12.0 0.1 8.0
500 - 749 lbs 2,908 1.9 471 0.3 182 0.6 385 15.1 0.4 7.8 - 14.7 0.1 10.5
750 - 999 lbs 2,203 1.4 425 0.3 155 0.5 359 9.2 0.1 7.8 - 15.3 0.1 9.6
1,000 - 9,999 lbs 40,897 26.1 8,731 5.2 3,016 9.4 351 12.4 2.1 5.7 0.5 6.9 1.0 8.3
10,000 - 49,999 lbs 67,256 43.0 112,259 66.6 15,982 50.0 166 9.1 3.4 13.1 4.3 5.1 4.5 13.2
50,000 - 99,999 lbs 6,035 3.9 26,973 16.0 1,659 5.2 63 22.6 0.9 15.8 2.5 13.6 0.7 14.9
More than 100,000 lbs 5,770 3.7 18,318 10.9 10,484 32.8 635 25.8 0.9 20.1 2.8 21.8 5.4 5.2

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 137,141 100 160,923 100 26,986 100 203 5.8 - 10.1 - 3.3 - 16.5
Less than 50 lbs 2,852 2.1 165 0.1 18 0.1 160 28.0 0.4 21.3 - 20.8 - 37.4
50 - 99 lbs 1,373 1.0 176 0.1 25 0.1 132 17.3 0.1 28.5 - 28.4 - 14.4
100 - 499 lbs 13,968 10.2 766 0.5 227 0.8 278 35.6 3.4 7.7 0.1 10.1 0.1 10.7
500 - 749 lbs 2,522 1.8 431 0.3 158 0.6 364 10.8 0.3 6.8 - 14.0 0.1 10.3
750 - 999 lbs 2,167 1.6 415 0.3 152 0.6 361 9.6 0.1 7.8 - 15.7 0.1 9.7
1,000 - 9,999 lbs 39,866 29.1 8,532 5.3 2,905 10.8 341 13.0 2.5 6.0 0.6 7.5 1.0 8.9
10,000 - 49,999 lbs 64,948 47.4 110,606 68.7 14,893 55.2 157 9.4 3.4 13.2 4.0 5.7 3.9 11.2
50,000 - 99,999 lbs 5,005 3.6 26,559 16.5 1,542 5.7 59 20.4 0.7 15.8 2.6 13.5 0.7 15.8
More than 100,000 lbs 4,439 3.2 13,273 8.2 7,066 26.2 656 28.4 0.9 20.5 1.8 19.5 4.3 5.8

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 132,497 100 148,917 100 20,193 100 176 6.0 - 10.7 - 4.0 - 11.5
Less than 50 lbs 2,748 2.1 162 0.1 16 0.1 93 29.1 0.4 22.1 - 25.4 - 21.0
50 - 99 lbs 1,364 1.0 176 0.1 24 0.1 132 17.4 0.1 28.5 - 28.3 - 14.6
100 - 499 lbs 13,673 10.3 761 0.5 222 1.1 273 36.7 3.5 7.7 0.1 10.6 0.1 11.0
500 - 749 lbs 2,515 1.9 431 0.3 157 0.8 363 10.7 0.3 6.8 0.1 14.0 0.1 10.3
750 - 999 lbs 2,156 1.6 413 0.3 150 0.7 359 9.8 0.1 8.2 - 16.2 0.1 10.0
1,000 - 9,999 lbs 39,719 30.0 8,526 5.7 2,901 14.4 340 13.0 2.7 6.0 0.7 7.6 0.9 9.0
10,000 - 49,999 lbs 64,556 48.7 110,464 74.2 14,757 73.1 156 9.6 3.5 13.2 3.5 5.7 1.8 11.2
50,000 - 99,999 lbs 4,955 3.7 26,477 17.8 1,490 7.4 58 20.5 0.8 15.7 3.1 13.1 1.0 16.1
More than 100,000 lbs 810 0.6 1,508 1.0 475 2.4 276 47.3 0.3 23.8 0.4 36.8 1.0 29.6

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 91,216 100 70,210 100 16,550 100 537 6.8 - 8.6 - 2.7 - 5.5
Less than 50 lbs 466 0.5 8 - 5 - 588 40.8 0.2 19.6 - 23.5 - 12.3
50 - 99 lbs 318 0.3 15 - 12 0.1 798 26.5 0.1 23.6 - 29.1 - 9.1
100 - 499 lbs 10,920 12.0 256 0.4 182 1.1 698 46.6 4.4 13.0 0.1 13.5 0.1 5.1
500 - 749 lbs 1,631 1.8 176 0.3 134 0.8 763 14.6 0.3 15.2 0.1 16.7 0.1 6.0
750 - 999 lbs 1,440 1.6 196 0.3 132 0.8 672 14.8 0.2 20.2 0.1 19.8 0.2 5.5
1,000 - 9,999 lbs 20,860 22.9 3,538 5.0 2,266 13.7 670 5.1 1.2 6.7 0.7 8.3 1.0 5.6
10,000 - 49,999 lbs 51,323 56.3 51,880 73.9 12,326 74.5 278 10.9 3.9 9.8 4.4 4.1 2.0 7.1
50,000 - 99,999 lbs 3,502 3.8 13,281 18.9 1,042 6.3 82 31.0 1.3 28.9 4.5 21.9 1.4 18.1
More than 100,000 lbs S S 859 1.2 451 2.7 501 S S 36.9 0.5 38.3 1.1 19.2

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 41,281 100 78,707 100 3,643 100 71 11.6 - 15.7 - 13.9 - 7.7
Less than 50 lbs 2,282 5.5 153 0.2 11 0.3 63 35.4 1.4 23.2 - 33.2 0.2 12.4
50 - 99 lbs 1,046 2.5 161 0.2 12 0.3 79 17.2 0.5 29.6 0.1 33.1 0.2 10.8
100 - 499 lbs 2,753 6.7 504 0.6 40 1.1 76 12.5 1.2 10.8 0.3 12.5 0.3 8.1
500 - 749 lbs 883 2.1 255 0.3 23 0.6 89 10.4 0.5 9.9 0.1 16.0 0.1 8.7
750 - 999 lbs 716 1.7 217 0.3 18 0.5 83 10.6 0.2 11.2 0.1 18.0 0.1 10.0
1,000 - 9,999 lbs 18,859 45.7 4,989 6.3 635 17.4 117 23.6 4.9 9.4 1.9 10.9 2.1 8.4
10,000 - 49,999 lbs 13,233 32.1 58,584 74.4 2,431 66.7 45 15.5 4.3 18.0 3.5 16.1 3.3 15.7
50,000 - 99,999 lbs 1,453 3.5 13,196 16.8 449 12.3 35 24.2 1.2 20.1 2.8 24.6 1.7 31.6
More than 100,000 lbs 54 0.1 648 0.8 24 0.7 S 38.5 0.1 36.9 0.6 28.4 0.5 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 3,630 100 9,795 100 6,294 100 782 25.8 - 22.3 - 21.9 - 9.8
Less than 50 lbs S S S S S S S S S S S S S S
50 - 99 lbs - - - - - - - - - - - - - -
100 - 499 lbs 1 - S S S S S 32.2 0.2 S S S S S
500 - 749 lbs S S - - - - S S S 28.3 - 24.8 - S
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 2 - S S S S S 46.0 - S
10,000 - 49,999 lbs 132 3.6 142 1.4 135 2.1 1,093 43.2 4.7 38.1 2.1 32.6 1.9 24.9
50,000 - 99,999 lbs 49 1.3 81 0.8 51 0.8 590 43.5 1.3 42.6 0.6 45.5 0.6 37.3
More than 100,000 lbs 3,392 93.5 9,569 97.7 6,106 97.0 740 27.1 4.7 23.0 2.1 22.5 1.9 4.3

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 227 100 2,131 100 S S S 35.9 - 42.8 - 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 227 100.0 2,131 100.0 S S S 35.9 - 42.8 - 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 227 100 2,131 100 S S S 35.9 - 42.8 - 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 227 100.0 2,131 100.0 S S S 35.9 - 42.8 - 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 776 100 14 100 13 100 1,014 40.1 - 30.5 - 27.8 - 15.4
Less than 50 lbs 104 13.4 S S S S 1,017 48.4 8.1 S S S S 15.3
50 - 99 lbs S S S S S S 1,861 S S S S S S 24.5
100 - 499 lbs S S S S 5 38.7 957 S S S S 47.4 13.3 22.4
500 - 749 lbs 3 0.4 S S - 0.3 483 43.6 2.5 S S 46.1 0.2 49.5
750 - 999 lbs S S S S S S S S S S S S S S
1,000 - 9,999 lbs 96 12.4 3 22.4 2 18.4 815 39.2 14.6 36.6 12.5 41.3 13.0 25.7
10,000 - 49,999 lbs S S 1 5.1 S S S S S 34.3 9.6 S S 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 11 100 S S S S S 32.0 - 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 9 84.0 S S S S S 37.2 11.3 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 17,131 100 6,030 100 4,610 100 819 14.5 - 36.2 - 36.1 - 2.9
Less than 50 lbs 6,638 38.7 111 1.8 84 1.8 818 21.6 5.0 16.9 1.8 16.5 1.8 3.2
50 - 99 lbs 2,022 11.8 49 0.8 42 0.9 830 39.1 3.4 17.9 0.7 22.0 0.8 5.3
100 - 499 lbs 4,221 24.6 122 2.0 96 2.1 822 39.3 4.8 30.6 1.1 31.6 1.3 5.1
500 - 749 lbs S S 34 0.6 24 0.5 713 S S 37.8 0.5 39.7 0.3 31.1
750 - 999 lbs 16 0.1 2 - S S S 26.3 - 26.3 0.1 S S S
1,000 - 9,999 lbs S S S S S S 2,066 S S S S S S 24.2
10,000 - 49,999 lbs 1,477 8.6 538 8.9 838 18.2 1,586 21.4 2.7 21.9 3.6 24.4 5.9 7.9
50,000 - 99,999 lbs 956 5.6 198 3.3 106 2.3 546 16.6 10.8 17.8 12.1 20.9 9.3 23.9
More than 100,000 lbs 1,309 7.6 4,964 82.3 3,398 73.7 574 32.1 2.4 43.6 10.0 48.1 11.1 7.4

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 13,263 100 316 100 244 100 818 22.3 - 17.6 - 19.4 - 3.0
Less than 50 lbs 6,638 50.0 111 35.0 84 34.5 818 21.6 6.5 16.9 6.9 16.5 7.0 3.2
50 - 99 lbs 2,022 15.2 49 15.6 42 17.2 830 39.1 3.6 17.9 1.3 22.0 1.6 5.3
100 - 499 lbs 4,220 31.8 122 38.5 95 38.9 820 39.3 6.0 30.8 5.0 32.1 5.2 5.3
500 - 749 lbs S S 33 10.5 23 9.3 688 S S 38.6 2.7 43.5 2.6 11.4
750 - 999 lbs 11 0.1 1 0.5 S S S 43.2 0.1 37.6 0.8 S S S
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 3,100 100 2,501 100 1,864 100 1,269 25.3 - 32.9 - 27.5 - 8.0
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 S S S S S S S S S S S S S S
750 - 999 lbs 5 0.2 - - S S S 26.1 0.5 47.1 0.1 S S S
1,000 - 9,999 lbs S S S S S S 2,103 S S S S S S 12.3
10,000 - 49,999 lbs 1,374 44.3 517 20.7 789 42.3 1,562 21.8 7.2 22.4 4.9 24.7 5.4 7.5
50,000 - 99,999 lbs 956 30.9 198 7.9 106 5.7 546 16.6 16.0 17.8 13.5 20.9 11.2 23.9
More than 100,000 lbs 688 22.2 1,776 71.0 950 51.0 557 43.5 5.8 40.3 7.5 35.6 6.8 12.2

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 S S S S S S 2,407 S S S S S S 20.1
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 S S S S S S 1,913 S S S S S S 48.7
10,000 - 49,999 lbs S S S S S S 2,670 S S S S S S 6.1
50,000 - 99,999 lbs - - - - - - - - - - - - - -
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 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 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 783 S S S S S S 21.4
Less than 50 lbs - - - - - - - - - - - - - -
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 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 2,142 100 1,642 100 376 100 S 16.7 - 31.1 - 31.7 - S
Less than 50 lbs 139 6.5 6 0.4 - 0.1 37 20.8 2.2 29.2 0.3 23.0 0.1 28.7
50 - 99 lbs 31 1.5 4 0.3 S S 67 44.2 1.1 41.9 0.2 S S 26.7
100 - 499 lbs 101 4.7 18 1.1 1 0.2 38 27.3 2.2 32.4 1.1 32.8 0.3 24.5
500 - 749 lbs 11 0.5 S S - 0.1 S 41.6 0.6 S S 42.1 0.1 S
750 - 999 lbs S S S S S S S S S S S S S S
1,000 - 9,999 lbs 913 42.6 186 11.3 91 24.2 614 34.0 8.1 26.4 3.7 42.1 6.3 24.0
10,000 - 49,999 lbs 831 38.8 1,115 67.9 251 66.6 283 23.4 5.2 34.8 6.9 39.9 7.7 26.8
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

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.