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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 B-17. Estimated Measures of Reliability for Shipment Characteristics of Temperature Controlled Shipments (1) by Total Modal Activity for the United States: 2012

Monday, July 13, 2015

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(Estimates are based on data from the 2012 Commodity Flow Survey)

Mode of transportation (2) Ton-miles (3) Average miles per shipment
Coefficient of variation of number Standard error of percent of total coefficient of variation of number
Total 2.1 0 5.8
Truck (4) 2.5 1.3 4.6
Rail 6.5 0.9 13.2
Inland water 43.7 0.7 35.1
Great Lakes S S 36.3
Deep sea 17.3 0.2 13.1
Air (includes truck and air) S S 13.3
Pipeline (5) S S S
Parcel, U.S. Postal Service, or courier 16.9 Z 6.8
Other modes 0 0 0

KEY: S = Withheld because estimate did not meet publication standards.

Z = Rounds to zero.

(1) Shipments that are temperature controlled are transported in a vehicle or container that regulates or maintains the temperature when en route to its destination.

(2) Estimates represent activity for a given mode across single and multiple mode shipments. For example, “Truck” ton-miles includes total ton-miles for shipments moving only by truck plus ton-miles for truck segments of multiple mode shipments.

(3) Ton-miles estimates are based on estimated distances traveled along a modeled transportation network. See “Mileage Calculations” section for additional information.

(4) “Truck” as a single mode includes shipments that were made by only private truck or only for-hire truck.

(5) Estimates for pipeline exclude shipments of crude petroleum (SCTG 16).

NOTES: The Introduction and appendixes give information on confidentiality protection, sampling error, nonsampling error, sample design and definitions. Links to this information on the Internet may be found at <>.

SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics and U.S. Department of Commerce, U.S. Census Bureau, 2012 Economic Census: Transportation Commodity Flow Survey, December 2014.