Table B-7a. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Hazard Class Division and Mode of Transportation: 2002

Table B-7a. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Hazard Class Division 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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Division 1.1, Explosives with a mass explosion hazard

Hazard Class Division and Mode of Transportation 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 33.9 S S S S S
Single modes 33.5 1.0 S S S S S
Truck 33.5 1.0 S S S S S
For-hire truck 44.3 13.4 S S S S 27.1
Private truck S S S S S S 39.1
Rail
Water
Air (includes truck and air)
Pipeline S S S
Multiple modes S S S S S S 31.6
Parcel, U.S.P.S. or courier S S S S S S 31.6
Other multiple modes
Other and unknown modes S S S S S S 31.6

Division 1.2, Explosives with a projection hazard

Hazard Class Division and Mode of Transportation 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 S S S S S S 31.6
Single modes S S S S S S 31.6
Truck S S S S S S 31.6
For-hire truck S S S S S S 31.6
Private truck
Rail
Water
Air (includes truck and air)
Pipeline S S S
Multiple modes
Parcel, U.S.P.S. or courier
Other multiple modes
Other and unknown modes

Division 1.3, Explosives with predominantly a fire hazard

Hazard Class Division and Mode of Transportation 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 S S 46.8 43.3 23.3
Single modes S S 46.8 43.3 23.3
Truck S S S S 47.9 5.2 23.5
For-hire truck S S S S S S 26.3
Private truck S S S S S S 40.0
Rail S S S S S S 31.6
Water
Air (includes truck and air) S S S S S S 31.6
Pipeline S S S
Multiple modes
Parcel, U.S.P.S. or courier
Other multiple modes
Other and unknown modes

Division 1.4, Explosives with no significant blast hazard

Hazard Class Division and Mode of Transportation 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 27.0 34.4 26.7 8.4
Single modes 28.1 3.5 35.0 1.8 27.4 1.9 12.1
Truck 27.8 3.3 35.1 1.9 27.5 2.3 11.8
For-hire truck 25.2 3.9 36.6 2.7 27.9 2.7 8.4
Private truck S S 41.7 1.9 S S 32.9
Rail S S S S S S 31.6
Water
Air (includes truck and air) S S 49.7 0.3 S S 16.3
Pipeline S S S
Multiple modes 38.3 3.5 S S S S 10.8
Parcel, U.S.P.S. or courier 38.3 3.5 S S S S 10.8
Other multiple modes
Other and unknown modes S S S S S S S

Division 1.5, Very insensitive explosives, blasting agent

Hazard Class Division and Mode of Transportation 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 35.9 47.9 38.1 S
Single modes 35.9 0.2 47.9 38.1 S
Truck 36.5 3.6 49.3 3.9 38.1 7.0 32.6
For-hire truck 48.5 5.5 45.7 9.2 46.2 9.3 15.4
Private truck 39.2 7.8 S S 45.7 9.2 49.0
Rail 44.9 2.7 41.6 3.9 44.6 7.7 24.2
Water
Air (includes truck and air) S S S S S S 28.0
Pipeline S S S
Multiple modes S S S S S S 28.2
Parcel, U.S.P.S. or courier S S S S S S 28.2
Other multiple modes
Other and unknown modes S S S S S S 34.9

Division 2.1, Flammable gases

Hazard Class Division and Mode of Transportation 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 10.6 10.5 14.1 33.4
Single modes 10.7 0.4 10.5 0.2 13.9 0.5 33.8
Truck 11.5 5.3 19.7 6.3 35.4 4.5 36.9
For-hire truck 24.9 3.1 29.7 3.4 49.5 4.6 20.3
Private truck 14.5 5.1 28.1 6.1 39.1 2.1 22.4
Rail 20.5 2.8 19.1 3.0 15.9 4.3 7.5
Water 43.1 1.1 37.8 2.3 32.7 2.2 32.4
Air (includes truck and air) S S S S S S 27.6
Pipeline 23.4 4.5 21.6 5.1 S S S
Multiple modes 33.8 0.2 44.4 0.2 49.3 0.5 17.5
Parcel, U.S.P.S. or courier S S S S S S 25.1
Other multiple modes 38.7 44.7 0.2 49.8 0.5 S
Other and unknown modes S S 32.7 38.7 S

Division 2.2, Nonflammable, nontoxic compressed gases

Hazard Class Division and Mode of Transportation 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 11.8 36.7 29.6 38.9
Single modes 12.1 1.2 36.8 0.3 30.1 2.2 34.9
Truck 12.7 2.0 27.2 9.9 29.1 7.9 35.3
For-hire truck 24.3 8.2 43.9 6.8 31.3 9.8 13.2
Private truck 23.0 7.8 31.7 9.4 42.7 9.7 37.7
Rail 41.8 0.3 45.3 0.6 S S 19.2
Water S S S S S S 31.7
Air (includes truck and air) 41.5 0.2 S S S S 19.2
Pipeline S S S S S S S
Multiple modes 29.4 1.2 40.2 0.1 S S 32.1
Parcel, U.S.P.S. or courier 35.7 1.2 S S 28.3 35.1
Other multiple modes 43.7 0.1 S S S S 27.5
Other and unknown modes 37.0 0.2 29.5 0.1 S S S

Division 2.3, Gases toxic by inhalation

Hazard Class Division and Mode of Transportation 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 11.8 13.9 11.3 27.3
Single modes 11.8 0.4 13.9 0.7 11.2 0.2 27.4
Truck 18.0 7.4 22.6 6.2 26.3 6.1 32.1
For-hire truck 29.8 7.3 35.3 5.7 35.7 5.8 30.3
Private truck 23.2 7.0 26.4 4.5 S S 31.0
Rail 17.9 4.9 11.5 5.9 12.7 7.9 9.7
Water S S S S S S 31.8
Air (includes truck and air) S S S S S S 25.8
Pipeline 43.5 5.5 40.4 6.1 S S S
Multiple modes S S S S S S 41.9
Parcel, U.S.P.S. or courier S S S S 41.1 41.7
Other multiple modes S S S S S S 31.6
Other and unknown modes 44.1 0.5 S S 46.5 0.2 S

Division 4.1, Flammable solids

Hazard Class Division and Mode of Transportation 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 30.0 9.7 16.8 43.3
Single modes 32.6 6.2 9.7 0.2 16.9 0.5 S
Truck 38.9 9.4 7.1 6.4 24.7 5.9 S
For-hire truck 21.6 6.3 12.3 6.7 32.9 4.2 28.1
Private truck 46.1 10.6 21.7 4.4 18.7 2.8 S
Rail S S 26.5 5.0 20.4 7.5 14.8
Water 44.1 0.7 49.9 5.4 S S 30.1
Air (includes truck and air) S S S S S S 25.4
Pipeline S S S S S S S
Multiple modes S S S S S S 44.0
Parcel, U.S.P.S. or courier 39.7 2.2 46.8 48.5 20.7
Other multiple modes S S S S S S 31.1
Other and unknown modes S S S S S S S

Division 4.2, Spontaneously combustible materials

Hazard Class Division and Mode of Transportation 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 36.3 35.4 39.4 19.4
Single modes 37.7 1.5 35.6 1.1 39.8 2.8 23.9
Truck 39.6 3.9 43.3 9.7 S S 24.4
For-hire truck S S 45.6 10.8 S S 19.0
Private truck 20.9 9.9 27.2 9.0 S S 21.1
Rail 36.9 2.9 S S 43.1 13.1 25.8
Water
Air (includes truck and air) S S S S S S 28.7
Pipeline S S S
Multiple modes 46.0 1.5 33.3 1.1 S S 23.8
Parcel, U.S.P.S. or courier 46.2 1.5 33.8 1.1 S S 23.8
Other multiple modes S S S S S S 30.1
Other and unknown modes S S S S S S S

Division 4.3, Dangerous when wet materials

Hazard Class Division and Mode of Transportation 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 S S 42.8 S S 17.6
Single modes S S 45.2 5.8 S S 21.5
Truck S S 48.0 7.0 S S 22.6
For-hire truck S S S S S S 21.5
Private truck 41.1 9.1 36.4 10.8 S S 37.0
Rail S S S S S S 29.8
Water
Air (includes truck and air) S S S S S S 28.0
Pipeline S S S
Multiple modes 46.0 3.3 S S S S 29.9
Parcel, U.S.P.S. or courier S S S S S S 25.6
Other multiple modes S S S S S S 27.3
Other and unknown modes S S S S S S S

Division 5.1, Oxidizers

Hazard Class Division and Mode of Transportation 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 21.2 29.1 29.4 21.0
Single modes 21.8 2.0 29.1 1.7 30.0 2.4 17.3
Truck 25.3 5.2 37.0 6.6 47.2 8.5 19.3
For-hire truck 24.6 7.5 44.2 8.4 S S 15.6
Private truck 40.5 7.7 32.2 6.2 21.5 2.7 19.4
Rail 41.0 5.2 24.2 6.5 22.1 8.8 16.8
Water
Air (includes truck and air) S S 49.7 S S 31.3
Pipeline S S S
Multiple modes 41.5 1.8 S S S S 18.0
Parcel, U.S.P.S. or courier S S S S S S 25.1
Other multiple modes 49.3 1.9 S S S S S
Other and unknown modes S S S S S S S

Division 5.2, Organic peroxides

Hazard Class Division and Mode of Transportation 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 49.4 S S S S 16.4
Single modes 49.7 1.2 S S S S 17.6
Truck S S S S S S 17.7
For-hire truck S S S S S S 16.0
Private truck S S 44.1 14.5 49.5 11.8 31.7
Rail S S S S S S 30.1
Water
Air (includes truck and air) S S S S S S 31.6
Pipeline S S S
Multiple modes S S S S S S 29.5
Parcel, U.S.P.S. or courier S S S S S S 29.5
Other multiple modes
Other and unknown modes S S S S S S 31.6

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.