HAZMAT Table B–6b ,,,,,,,,,,,,
"Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Hazard Class and Mode of Transportation: 2002 and 1997
",,,,,,,,,,,,
"[Estimates are shown as percents and are based on data from the 2002 and 1997 Commodity Flow Surveys]
",,,,,,,,,,,,
Hazard class and mode of transporation,Value,,,Tons,,,Ton–miles,,,Average miles per shipment,,
,CV,,Std. error of percent,CV,,Std. error of percent,CV,,Std. error of percent,CV,,Std. error of percent
,2002,1997,,2002,1997,,2002,1997,,2002,1997,
"Class 1, Explosives",,,,,,,,,,,,
All modes,23.8,7.3,35.3,43.2,21.7,140.7,29.5,S,S,10.9,8.4,11.6
Single modes,24.5,7.9,39.7,43.2,22.2,143.9,29.5,S,S,20.6,13.5,26.1
Truck ,24.6,6.8,47.1,44.1,18.9,175.1,27.8,26.4,93.1,23.4,13.5,32.0
For-hire truck ,27.0,10.3,58.4,33.9,19.7,147.9,27.9,14.4,94.8,8.6,6.7,10.6
Private truck,34.9,13.1,49.7,S,26.0,S,44.1,S,S,15.6,12.7,14.1
Rail,48.8,48.1,9.5,41.3,S,S,44.3,S,S,19.9,20.2,15.6
Water,—,—,—,—,—,—,—,—,—,—,—,—
Air (includes truck and air),S,32.5,S,44.4,27.4,34.4,46.1,26.8,102.4,15.5,10.1,22.3
Pipeline ,—,—,—,—,—,—,S,S,S,S,S,S
Multiple modes,38.3,17.0,12.5,S,13.3,S,S,16.3,S,10.7,8.8,12.8
"Parcel, U.S.P.S. or courier",38.3,17.1,12.6,S,14.3,S,S,16.4,S,10.7,8.8,12.8
Other multiple modes,—,S,S,—,S,S,—,S,S,—,30.1,—
Other and unknown modes,S,S,S,S,S,S,S,S,S,32.2,33.2,1.1
"Class 2, Gases",,,,,,,,,,,,
All modes,7.9,6.1,15.7,15.6,5.0,25.5,8.9,13.8,23.5,29.0,12.8,50.4
Single modes,8.1,5.4,15.6,15.7,4.3,26.0,8.8,14.1,24.0,27.1,14.6,51.9
Truck ,9.6,8.6,24.6,17.4,7.0,29.0,15.5,10.5,34.8,28.3,12.6,54.7
For-hire truck ,13.4,6.4,33.6,20.1,15.8,37.1,25.2,18.0,57.9,17.9,12.1,26.7
Private truck,12.4,15.4,33.8,23.3,8.6,39.9,27.9,12.4,55.8,25.9,5.2,36.9
Rail,16.4,15.2,33.5,15.5,10.2,30.2,12.7,18.3,29.8,7.2,11.2,12.5
Water,38.0,15.5,47.1,32.4,21.4,42.8,31.2,39.1,43.5,31.2,21.5,12.8
Air (includes truck and air),34.4,25.3,21.8,S,32.7,S,S,48.4,S,16.7,12.1,20.7
Pipeline ,23.8,9.0,29.8,35.3,5.8,61.8,S,S,S,S,S,S
Multiple modes,28.1,22.0,49.4,34.9,30.7,59.9,44.8,35.0,154.5,25.5,23.9,62.1
"Parcel, U.S.P.S. or courier",37.5,19.3,80.2,S,S,S,30.5,S,S,27.6,18.3,48.3
Other multiple modes,32.2,34.6,34.6,36.8,32.3,67.2,45.6,35.5,171.8,S,S,S
Other and unknown modes,40.0,32.4,16.0,23.8,S,S,30.8,46.6,10.3,S,S,S
"Class 3, Flammable liquids",,,,,,,,,,,,
All modes,3.7,3.4,6.4,4.3,3.0,6.5,5.2,9.4,12.7,12.2,6.3,21.3
Single modes,3.7,3.4,6.4,4.2,3.0,6.4,6.3,8.5,13.2,9.4,5.7,13.3
Truck ,4.3,4.3,7.6,5.1,4.5,8.2,8.4,7.3,14.8,7.0,5.7,10.2
For-hire truck ,8.0,6.7,13.6,8.0,8.7,14.5,16.8,9.4,26.3,9.0,9.4,14.1
Private truck,4.6,3.4,6.9,5.0,2.9,6.9,9.5,10.1,18.2,10.1,5.2,12.4
Rail,10.8,9.1,15.4,8.5,11.6,18.2,13.7,11.0,20.1,7.9,5.6,8.0
Water,13.8,12.7,28.9,15.6,13.1,29.5,12.3,16.6,26.0,S,S,S
Air (includes truck and air),30.8,S,S,S,33.8,S,S,39.9,S,11.2,8.4,26.0
Pipeline ,7.3,6.2,12.9,7.4,6.8,12.2,S,S,S,S,S,S
Multiple modes,20.9,18.8,44.4,30.0,29.8,63.1,22.0,S,S,15.4,11.1,35.2
"Parcel, U.S.P.S. or courier",32.3,19.7,117.9,34.1,30.1,95.1,26.5,24.6,82.2,15.5,7.8,27.6
Other multiple modes,24.6,20.7,41.5,30.2,29.9,63.3,22.1,S,S,26.6,S,S
Other and unknown modes,19.4,16.0,22.5,22.6,12.1,26.4,S,18.6,S,43.4,16.2,92.8
"Class 4, Flammable solids",,,,,,,,,,,,
All modes,22.1,8.1,36.5,8.8,22.8,18.7,14.0,35.1,17.1,46.3,15.0,11.7
Single modes,24.4,7.4,37.9,8.9,23.2,19.0,14.4,35.7,17.4,32.2,13.2,7.7
Truck ,27.5,9.4,48.2,11.7,36.9,33.3,40.8,10.9,62.6,24.8,16.1,6.9
For-hire truck ,40.1,9.9,49.6,19.5,7.4,25.3,48.6,15.1,81.7,20.5,9.1,13.3
Private truck,36.1,21.1,107.1,15.8,S,S,25.5,35.0,44.5,28.6,27.1,3.9
Rail,39.2,14.1,30.3,21.4,37.0,20.8,13.2,39.7,12.0,14.4,10.0,11.0
Water,44.1,S,S,49.9,S,S,S,S,S,30.1,29.5,50.0
Air (includes truck and air),S,45.8,S,S,S,S,S,S,S,19.9,19.8,42.2
Pipeline ,S,S,S,S,46.4,S,S,S,S,S,S,S
Multiple modes,S,48.3,S,S,S,S,S,S,S,S,16.2,S
"Parcel, U.S.P.S. or courier",32.5,S,S,29.0,43.4,62.4,S,47.7,S,23.6,16.9,11.0
Other multiple modes,S,S,S,S,S,S,S,S,S,26.6,26.1,90.5
Other and unknown modes,S,37.5,S,S,S,S,S,46.2,S,S,S,S
"Class 5, Oxidizers and organic peroxides",,,,,,,,,,,,
All modes,21.8,13.7,31.4,26.8,12.1,40.3,25.3,18.7,29.7,18.7,13.9,49.2
Single modes,22.4,13.9,32.3,26.6,12.1,39.7,25.6,18.8,29.0,14.3,14.5,41.6
Truck ,26.4,14.7,42.7,33.5,14.1,61.4,39.1,18.7,74.8,15.9,15.1,48.1
For-hire truck ,19.7,16.7,31.2,37.6,20.5,98.3,44.0,22.1,102.2,13.0,7.7,16.7
Private truck,37.3,13.7,69.6,32.1,12.6,36.4,21.4,15.5,18.7,17.3,18.1,28.3
Rail,40.6,40.2,38.1,24.2,21.2,24.5,22.0,26.1,15.7,16.3,11.4,14.4
Water,—,S,S,—,S,S,—,S,S,—,S,S
Air (includes truck and air),S,46.3,S,49.6,S,S,S,S,S,26.6,23.9,19.0
Pipeline ,—,—,—,—,—,—,S,S,S,S,S,S
Multiple modes,41.4,35.6,121.5,S,S,S,S,S,S,18.2,12.1,57.3
"Parcel, U.S.P.S. or courier",S,S,S,S,47.7,S,S,34.4,S,23.0,9.2,69.1
Other multiple modes,49.3,43.8,257.1,S,S,S,S,S,S,S,23.1,S
Other and unknown modes,S,36.4,S,S,S,S,S,S,S,S,42.0,S
"Class 6, Toxic (poison)",,,,,,,,,,,,
All modes,11.6,8.8,11.9,15.9,16.4,30.3,22.2,10.9,37.2,21.3,13.4,39.0
Single modes,12.5,8.7,12.5,16.9,16.8,31.5,22.9,10.8,38.5,25.4,13.0,44.4
Truck ,13.5,9.3,11.0,15.1,13.4,16.0,13.7,9.8,14.7,14.0,16.2,23.1
For-hire truck ,18.8,10.5,18.0,14.1,11.3,17.0,14.0,10.6,16.4,14.5,7.8,17.2
Private truck,21.0,20.8,12.7,29.0,33.3,24.4,30.2,28.9,23.7,15.5,29.4,10.3
Rail,14.0,9.6,13.2,14.0,12.8,18.5,15.8,8.2,21.1,6.0,12.2,16.8
Water,42.0,S,S,43.5,S,S,S,S,S,23.8,24.6,81.6
Air (includes truck and air),S,35.3,S,S,S,S,S,S,S,25.1,9.4,33.3
Pipeline ,S,30.0,S,47.5,37.8,284.4,S,S,S,S,S,S
Multiple modes,S,27.8,S,S,39.0,S,S,S,S,16.9,22.0,43.8
"Parcel, U.S.P.S. or courier",48.7,30.6,16.4,S,21.7,S,S,21.6,S,19.3,22.4,46.9
Other multiple modes,S,35.9,S,S,40.2,S,S,S,S,25.2,24.9,30.9
Other and unknown modes,S,30.6,S,S,31.5,S,45.0,30.6,113.3,S,23.7,S
"Class 7, Radioactive materials",,,,,,,,,,,,
All modes,39.0,20.9,95.2,31.2,24.0,25.6,31.7,26.7,37.7,S,27.7,S
Single modes,41.9,21.7,117.8,32.5,23.3,31.3,34.4,21.5,47.7,S,26.7,S
Truck ,42.2,27.5,185.7,32.8,23.7,37.2,35.3,11.2,78.9,S,43.1,S
For-hire truck ,47.4,19.3,286.9,34.4,23.0,28.4,30.4,15.2,58.2,S,49.1,S
Private truck,43.6,42.3,146.0,44.0,34.1,68.5,S,S,S,S,15.2,S
Rail,—,S,S,—,S,S,—,S,S,—,31.6,—
Water,—,—,—,—,—,—,—,—,—,—,—,—
Air (includes truck and air),42.2,28.5,4.7,41.4,33.6,5.1,43.5,34.6,7.5,23.7,9.4,33.2
Pipeline ,—,S,S,—,S,S,S,S,S,S,S,S
Multiple modes,45.5,37.5,73.7,42.5,43.5,22.2,42.0,48.9,22.6,23.6,20.8,34.3
"Parcel, U.S.P.S. or courier",45.5,37.5,73.7,42.5,43.5,22.2,42.0,48.9,22.6,23.6,20.8,34.3
Other multiple modes,—,—,—,—,—,—,—,—,—,—,—,—
Other and unknown modes,S,S,S,S,S,S,S,S,S,S,S,S
"Class 8, Corrosive materials",,,,,,,,,,,,
All modes,6.9,20.3,19.9,9.7,8.1,11.7,10.1,17.2,16.9,14.9,18.6,34.9
Single modes,6.7,20.0,19.9,9.6,7.9,11.6,9.7,17.3,16.6,14.9,20.0,36.5
Truck ,7.0,19.3,23.2,10.4,12.9,17.2,13.2,31.6,43.6,11.9,17.7,28.9
For-hire truck ,11.1,28.7,30.6,12.8,18.6,25.1,15.7,38.3,52.4,8.4,7.0,12.4
Private truck,8.3,6.0,15.1,12.4,15.8,18.3,21.3,17.7,36.2,9.9,28.1,35.4
Rail,11.9,36.9,20.5,14.4,13.3,18.3,15.1,21.7,23.0,5.1,12.5,9.6
Water,32.0,35.3,11.9,18.9,26.3,17.0,31.2,37.1,13.9,25.6,45.7,28.4
Air (includes truck and air),33.1,24.9,44.0,S,27.3,S,S,31.8,S,15.7,9.4,24.0
Pipeline ,44.5,S,S,45.2,29.6,122.8,S,S,S,S,S,S
Multiple modes,19.1,19.9,28.0,31.1,32.3,74.6,38.4,37.9,91.1,22.7,17.5,35.1
"Parcel, U.S.P.S. or courier",23.8,22.3,33.5,S,26.2,S,S,23.1,S,22.4,18.0,35.5
Other multiple modes,31.6,32.1,44.4,32.6,35.1,80.7,39.4,38.7,93.0,S,32.4,S
Other and unknown modes,S,49.2,S,36.8,41.4,16.5,42.7,S,S,37.5,29.0,142.9
"Class 9, Miscellaneous dangerous goods",,,,,,,,,,,,
All modes,13.4,7.6,15.2,20.6,14.1,23.3,11.8,12.7,15.4,9.3,8.8,14.6
Single modes,14.3,8.5,16.5,21.0,14.4,23.6,12.2,13.1,15.7,11.4,10.1,17.6
Truck ,18.1,7.3,20.9,26.7,12.6,27.7,22.0,10.5,21.7,13.0,15.2,23.9
For-hire truck ,17.4,9.3,18.7,25.0,15.3,25.2,16.1,13.9,14.9,21.0,7.6,20.5
Private truck,44.1,19.7,73.9,35.7,20.2,48.4,45.7,21.2,83.9,20.3,13.2,43.5
Rail,14.3,19.9,14.3,19.7,24.2,20.9,15.3,18.9,17.3,4.5,8.7,11.8
Water,26.4,S,S,30.4,S,S,38.8,S,S,26.8,28.2,46.1
Air (includes truck and air),39.3,33.5,106.9,S,40.1,S,S,41.9,S,11.2,6.3,21.7
Pipeline ,S,S,S,S,S,S,S,S,S,S,S,S
Multiple modes,19.7,25.6,33.2,S,22.0,S,38.1,19.9,72.2,33.5,16.9,40.4
"Parcel, U.S.P.S. or courier",21.6,36.2,49.4,24.2,28.9,25.7,20.1,31.9,51.5,39.1,18.0,45.9
Other multiple modes,32.4,28.9,36.9,S,22.0,S,38.3,19.9,72.5,23.9,12.4,20.0
Other and unknown modes,46.2,S,S,S,S,S,S,S,S,22.5,37.4,216.6
"
KEY: 
— Represents an estimate equal to zero or less than 1 unit of measure.  
S Estimate does not meet publication standards because of highly sampling variability or poor response quality. 
CV Coefficient of variation of number",,,,,,,,,,,,
"
NOTE: 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/cfs.",,,,,,,,,,,,
"SOURCE: Bureau of Transportation Statistics (USDOT) and U.S. Census Bureau, 2002 Commodity Flow Survey, Hazmat Data, December 2004.",,,,,,,,,,,,