Table B-20. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics of Temperature Controlled Shipments (1) by Selected UN Number (2) for the United States: 2012
(Estimates are based on data from the 2012 Commodity Flow Survey)
|UN number||UN description||Value||Tons||Ton-miles (3)||
Average miles per shipment
coefficient of variation of number
|Coefficient of variation of number||Standard error of percent of total||Coefficient of variation of number||Standard error of percent of total||Coefficient of variation of number||Standard error of percent of total|
|1075||Petroleum gases, liquefied or liquefied petroleum gas||36.7||1.8||24.0||0.7||S||S||10.5|
|1268||Petroleum distillates, n.o.s. or petroleum products, n.o.s.||S||S||S||S||46.6||1.6||27.0|
|1805||Phosphoric acid solution||41.9||2.4||41.0||1.7||39.0||3.6||20.8|
|1824||Sodium hydroxide solution||19.1||0.5||22.3||0.6||30.1||0.5||28.2|
|1956||Compressed gas, n.o.s.||33.0||0.1||S||S||S||S||47.4|
|1999||Tars, liquid including road oils and cutback bitumens, including road asphalt||S||S||47.0||3.1||S||S||17.6|
|2426||Ammonium nitrate, liquid (hot concentrated solution)||9.7||0.1||12.3||0.1||22.7||0.6||10.2|
|3082||Environmentally hazardous substance, liquid, n.o.s.||39.4||4.4||40.5||1.5||43.6||4.2||17.1|
|3256||Elevated temperature liquid, flammable, n.o.s., with flash point above 37.8 c, at or above its flash point||23.1||0.5||17.2||0.2||21.0||0.3||28.4|
|3257||Elevated temperature liquid, n.o.s., at or above 100 c and below its flash point||20.0||4.3||20.1||4.4||16.5||4.0||17.9|
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) UN numbers shown had the highest estimated weight without considering sampling variability. Since an “All other UN numbers” line is not shown, estimates do not add to total.
(3) Ton-miles estimates are based on estimated distances traveled along a modeled transportation network. See “Mileage Calculations” section for additional information.
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 <www.census.gov/econ/cfs>.
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.