Table B-6a. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Hazard Class and Mode of Transportation: 2002

Table B-6a. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Hazard Class and Mode of Transportation: 2002

[Estimates are shown as percents and are based on data from the 2002 Commodity Flow Survey]

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Class 1, Explosives

Hazard class and mode of transporation Value Tons Ton-miles CV of average miles
per shipment
CV Std. error of percent CV Std. error of percent CV Std. error of percent
All modes 23.8 43.2 29.5 10.9
Single modes 24.5 1.8 43.2 0.2 29.5 0.4 20.6
Truck 24.6 2.5 44.1 3.2 27.8 5.5 23.4
For– hire truck 27.0 4.4 33.9 12.0 27.9 9.6 8.6
Private truck 34.9 3.9 S S 44.1 5.6 15.6
Rail 48.8 1.8 41.3 3.1 44.3 5.6 19.9
Water
Air (includes truck and air) S S 44.4 46.1 0.6 15.5
Pipeline S S S
Multiple modes 38.3 1.8 S S S S 10.7
Parcel, U.S.P.S. or courier 38.3 1.8 S S S S 10.7
Other multiple modes
Other and unknown modes S S S S S S 32.2

Class 2, Gases

Hazard class and mode of transporation Value Tons Ton-miles CV of average miles
per shipment
CV Std. error of percent CV Std. error of percent CV Std. error of percent
All modes 7.9 15.6 8.9 29.0
Single modes 8.1 0.5 15.7 0.1 8.8 0.3 27.1
Truck 9.6 4.4 17.4 5.9 15.5 4.5 28.3
For– hire truck 13.4 3.6 20.1 2.9 25.2 3.7 17.9
Private truck 12.4 4.0 23.3 5.7 27.9 5.1 25.9
Rail 16.4 1.8 15.5 2.4 12.7 4.7 7.2
Water 38.0 0.6 32.4 1.6 31.2 1.5 31.2
Air (includes truck and air) 34.4 0.1 S S S S 16.7
Pipeline 23.8 3.6 35.3 5.8 S S S
Multiple modes 28.1 0.4 34.9 0.1 44.8 0.3 25.5
Parcel, U.S.P.S. or courier 37.5 0.4 S S 30.5 27.6
Other multiple modes 32.2 36.8 0.1 45.6 0.3 S
Other and unknown modes 40.0 0.2 23.8 30.8 S

Class 3, Flammable liquids

Hazard class and mode of transporation Value Tons Ton-miles CV of average miles
per shipment
CV Std. error of percent CV Std. error of percent CV Std. error of percent
All modes 3.7 4.3 5.2 12.2
Single modes 3.7 0.2 4.2 0.2 6.3 1.3 9.4
Truck 4.3 1.4 5.1 1.1 8.4 2.8 7.0
For– hire truck 8.0 1.4 8.0 0.8 16.8 3.0 9.0
Private truck 4.6 1.6 5.0 1.3 9.5 1.1 10.1
Rail 10.8 0.2 8.5 0.1 13.7 1.8 7.9
Water 13.8 1.2 15.6 1.7 12.3 2.9 S
Air (includes truck and air) 30.8 S S S S 11.2
Pipeline 7.3 1.4 7.4 1.6 S S S
Multiple modes 20.9 0.3 30.0 0.2 22.0 1.3 15.4
Parcel, U.S.P.S. or courier 32.3 0.1 34.1 26.5 15.5
Other multiple modes 24.6 0.2 30.2 0.2 22.1 1.3 26.6
Other and unknown modes 19.4 0.2 22.6 0.1 S S 43.4

Class 4, Flammable solids

Hazard class and mode of transporation Value Tons Ton-miles CV of average miles
per shipment
CV Std. error of percent CV Std. error of percent CV Std. error of percent
All modes 22.1 8.8 14.0 46.3
Single modes 24.4 5.4 8.9 0.3 14.4 0.8 32.2
Truck 27.5 7.6 11.7 5.7 40.8 6.4 24.8
For– hire truck 40.1 7.8 19.5 6.3 48.6 6.9 20.5
Private truck 36.1 7.1 15.8 4.0 25.5 1.8 28.6
Rail 39.2 4.3 21.4 3.7 13.2 6.2 14.4
Water 44.1 0.4 49.9 5.1 S S 30.1
Air (includes truck and air) S S S S S S 19.9
Pipeline S S S S S S S
Multiple modes S S S S S S S
Parcel, U.S.P.S. or courier 32.5 1.3 29.0 S S 23.6
Other multiple modes S S S S S S 26.6
Other and unknown modes S S S S S S S

Class 5, Oxidizers and organic peroxides

Hazard class and mode of transporation Value Tons Ton-miles CV of average miles
per shipment
CV Std. error of percent CV Std. error of percent CV Std. error of percent
All modes 21.8 26.8 25.3 18.7
Single modes 22.4 1.4 26.6 1.3 25.6 1.9 14.3
Truck 26.4 4.6 33.5 6.7 39.1 8.6 15.9
For– hire truck 19.7 6.4 37.6 7.7 44.0 9.5 13.0
Private truck 37.3 5.4 32.1 5.1 21.4 2.1 17.3
Rail 40.6 4.9 24.2 6.7 22.0 9.1 16.3
Water
Air (includes truck and air) S S 49.6 S S 26.6
Pipeline S S S
Multiple modes 41.4 1.2 S S S S 18.2
Parcel, U.S.P.S. or courier S S S S S S 23.0
Other multiple modes 49.3 1.2 S S S S S
Other and unknown modes S S S S S S S

Class 6, Toxic (poison)

Hazard class and mode of transporation Value Tons Ton-miles CV of average miles
per shipment
CV Std. error of percent CV Std. error of percent CV Std. error of percent
All modes 11.6 15.9 22.2 21.3
Single modes 12.5 2.8 16.9 2.7 22.9 1.9 25.4
Truck 13.5 2.9 15.1 5.2 13.7 6.1 14.0
For– hire truck 18.8 3.7 14.1 3.6 14.0 5.2 14.5
Private truck 21.0 3.5 29.0 2.5 30.2 1.0 15.5
Rail 14.0 2.4 14.0 5.6 15.8 6.0 6.0
Water 42.0 4.0 43.5 8.5 S S 23.8
Air (includes truck and air) S S S S S S 25.1
Pipeline S S 47.5 6.5 S S S
Multiple modes S S S S S S 16.9
Parcel, U.S.P.S. or courier 48.7 1.2 S S S S 19.3
Other multiple modes S S S S S S 25.2
Other and unknown modes S S S S 45.0 1.0 S

Class 7, Radioactive materials

Hazard class and mode of transporation Value Tons Ton-miles CV of average miles
per shipment
CV Std. error of percent CV Std. error of percent CV Std. error of percent
All modes 39.0 31.2 31.7 S
Single modes 41.9 5.3 32.5 2.4 34.4 5.0 S
Truck 42.2 8.5 32.8 2.1 35.3 6.8 S
For– hire truck 47.4 11.1 34.4 12.6 30.4 9.0 S
Private truck 43.6 8.7 44.0 11.7 S S S
Rail
Water
Air (includes truck and air) 42.2 7.6 41.4 1.7 43.5 7.0 23.7
Pipeline S S S
Multiple modes 45.5 5.3 42.5 2.5 42.0 5.0 23.6
Parcel, U.S.P.S. or courier 45.5 5.3 42.5 2.5 42.0 5.0 23.6
Other multiple modes
Other and unknown modes S S S S S S S

Class 8, Corrosive materials

Hazard class and mode of transporation Value Tons Ton-miles CV of average miles
per shipment
CV Std. error of percent CV Std. error of percent CV Std. error of percent
All modes 6.9 9.7 10.1 14.9
Single modes 6.7 0.8 9.6 0.5 9.7 1.1 14.9
Truck 7.0 1.4 10.4 1.8 13.2 3.9 11.9
For– hire truck 11.1 3.3 12.8 2.8 15.7 4.6 8.4
Private truck 8.3 3.1 12.4 1.3 21.3 1.0 9.9
Rail 11.9 1.1 14.4 2.5 15.1 4.4 5.1
Water 32.0 0.7 18.9 2.0 31.2 2.8 25.6
Air (includes truck and air) 33.1 0.1 S S S S 15.7
Pipeline 44.5 0.2 45.2 1.4 S S S
Multiple modes 19.1 0.4 31.1 0.3 38.4 1.1 22.7
Parcel, U.S.P.S. or courier 23.8 0.4 S S S S 22.4
Other multiple modes 31.6 0.2 32.6 0.3 39.4 1.1 S
Other and unknown modes S S 36.8 0.3 42.7 0.2 37.5

Class 9, Miscellaneous dangerous goods

Hazard class and mode of transporation Value Tons Ton-miles CV of average miles
per shipment
CV Std. error of percent CV Std. error of percent CV Std. error of percent
All modes 13.4 20.6 11.8 9.3
Single modes 14.3 1.9 21.0 0.9 12.2 1.6 11.4
Truck 18.1 4.6 26.7 6.5 22.0 4.5 13.0
For– hire truck 17.4 5.3 25.0 4.8 16.1 2.5 21.0
Private truck 44.1 5.8 35.7 4.7 45.7 3.8 20.3
Rail 14.3 2.3 19.7 3.5 15.3 5.4 4.5
Water 26.4 2.3 30.4 5.3 38.8 6.3 26.8
Air (includes truck and air) 39.3 1.2 S S S S 11.2
Pipeline S S S S S S S
Multiple modes 19.7 1.8 S S 38.1 1.6 33.5
Parcel, U.S.P.S. or courier 21.6 1.0 24.2 20.1 39.1
Other multiple modes 32.4 1.1 S S 38.3 1.6 23.9
Other and unknown modes 46.2 0.3 S S S S 22.5

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.