Table B-7c. Estimated Standard Error of Percentage for Hazardous Material Shipment Characteristics by Hazard Class Division and Mode of Transportation: Percent of Total for 2002 and 1997

Table B-7c. Estimated Standard Error of Percentage for Hazardous Material Shipment Characteristics by Hazard Class Division and Mode of Transportation: Percent of Total for 2002 and 1997

[Estimates are shown as percents and are based on data from the 2002 and 1997 Commodity Flow Surveys]

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Division 1.1, Explosives with a mass explosion hazard

Hazard Class Division and Mode of Transportation Value (percent) Tons (percent) Ton-miles (percent)
2002 1997 2002 1997 2002 1997
All modes S S S S
Single modes 1.0 0.4 S S S S
Truck 1.0 10.2 S 15.5 S S
For– hire truck 13.4 9.4 S 12.3 S 16.6
Private truck S 8.9 S S S S
Rail S S S
Water
Air (includes truck and air) S S S
Pipeline S S
Multiple modes S S S S S S
Parcel, U.S.P.S. or courier S S S S S S
Other multiple modes
Other and unknown modes S S S S S S

Division 1.2, Explosives with a projection hazard

Hazard Class Division and Mode of Transportation Value (percent) Tons (percent) Ton-miles (percent)
2002 1997 2002 1997 2002 1997
All modes S S S S
Single modes S S S S
Truck S S S 3.8 S 4.5
For– hire truck S S S 11.5 S 11.4
Private truck S S S
Rail
Water
Air (includes truck and air) S S S
Pipeline S S
Multiple modes
Parcel, U.S.P.S. or courier
Other multiple modes
Other and unknown modes S S S

Division 1.3, Explosives with predominantly a fire hazard

Hazard Class Division and Mode of Transportation Value (percent) Tons (percent) Ton-miles (percent)
2002 1997 2002 1997 2002 1997
All modes S
Single modes S 6.4 9.9 8.2
Truck S 7.0 S 9.9 5.2 8.2
For– hire truck S 10.3 S 11.4 S 9.3
Private truck S 8.2 S S S S
Rail S S S
Water
Air (includes truck and air) S S S S S S
Pipeline S S
Multiple modes S S S
Parcel, U.S.P.S. or courier S S S
Other multiple modes
Other and unknown modes S S S

Division 1.4, Explosives with no significant blast hazard

Hazard Class Division and Mode of Transportation Value (percent) Tons (percent) Ton-miles (percent)
2002 1997 2002 1997 2002 1997
All modes
Single modes 3.5 2.0 1.8 0.8 1.9 1.1
Truck 3.3 3.8 1.9 2.5 2.3 5.8
For– hire truck 3.9 4.9 2.7 5.7 2.7 7.6
Private truck S 4.6 1.9 4.8 S 3.5
Rail S S S S S S
Water
Air (includes truck and air) S 1.9 0.3 0.1 S 0.2
Pipeline S S
Multiple modes 3.5 2.2 S 0.9 S 1.2
Parcel, U.S.P.S. or courier 3.5 2.3 S 1 S 1.2
Other multiple modes S S S
Other and unknown modes S 0.7 S 0.4 S S

Division 1.5, Very insensitive explosives, blasting agent

Hazard Class Division and Mode of Transportation Value (percent) Tons (percent) Ton-miles (percent)
2002 1997 2002 1997 2002 1997
All modes
Single modes 0.2 0.3 0.4 1.4
Truck 3.6 0.3 3.9 0.4 7.0 1.4
For– hire truck 5.5 2.2 9.2 2.9 9.3 9.1
Private truck 7.8 2.3 S 3.1 9.2 S
Rail 2.7 3.9 7.7
Water
Air (includes truck and air) S S S
Pipeline S S
Multiple modes S S S S S S
Parcel, U.S.P.S. or courier S S S
Other multiple modes S S S
Other and unknown modes S S S S S S

Division 2.1, Flammable gases

Hazard Class Division and Mode of Transportation Value (percent) Tons (percent) Ton-miles (percent)
2002 1997 2002 1997 2002 1997
All modes
Single modes 0.4 1.3 0.2 0.7 0.5 1.1
Truck 5.3 3.1 6.3 2.4 4.5 3.3
For– hire truck 3.1 1.7 3.4 2.3 4.6 3.1
Private truck 5.1 4.0 6.1 1.7 2.1 1.3
Rail 2.8 1.2 3.0 1.2 4.3 5.9
Water 1.1 0.8 2.3 1.3 2.2 4.4
Air (includes truck and air) S S S S S S
Pipeline 4.5 3.4 5.1 2.6 S S
Multiple modes 0.2 0.2 0.2 0.2 0.5 0.5
Parcel, U.S.P.S. or courier S S S
Other multiple modes 0.2 0.2 0.2 0.5 0.5
Other and unknown modes S 1.3 0.7 S

Division 2.2, Nonflammable, nontoxic compressed gases

Hazard Class Division and Mode of Transportation Value (percent) Tons (percent) Ton-miles (percent)
2002 1997 2002 1997 2002 1997
All modes
Single modes 1.2 1.0 0.3 1.6 2.2 1.4
Truck 2.0 2.4 9.9 2.8 7.9 8.7
For– hire truck 8.2 3.5 6.8 1.3 9.8 3.3
Private truck 7.8 2.9 9.4 3.4 9.7 6.4
Rail 0.3 0.5 0.6 0.2 S 2.1
Water S S S S S S
Air (includes truck and air) 0.2 1.0 S S
Pipeline S 1.1 S 3.0 S S
Multiple modes 1.2 0.4 0.1 S S 0.2
Parcel, U.S.P.S. or courier 1.2 0.4 S S S
Other multiple modes 0.1 S S S S
Other and unknown modes 0.2 0.9 0.1 S S S

Division 2.3, Gases toxic by inhalation

Hazard Class Division and Mode of Transportation Value (percent) Tons (percent) Ton-miles (percent)
2002 1997 2002 1997 2002 1997
All modes
Single modes 0.4 2.0 0.7 4.6 0.2 0.5
Truck 7.4 3.2 6.2 3.9 6.1 1.7
For– hire truck 7.3 3.6 5.7 4.2 5.8 S
Private truck 7.0 4.2 4.5 3.8 S 1.2
Rail 4.9 3.6 5.9 3.1 7.9 5.1
Water S 2.2 S 4.4 S 4.7
Air (includes truck and air) S S S S S S
Pipeline 5.5 2.8 6.1 4.4 S S
Multiple modes S S S S S S
Parcel, U.S.P.S. or courier S S S S
Other multiple modes S S S S S S
Other and unknown modes 0.5 1.9 S S 0.2 S

Division 4.1, Flammable solids

Hazard Class Division and Mode of Transportation Value (percent) Tons (percent) Ton-miles (percent)
2002 1997 2002 1997 2002 1997
All modes
Single modes 6.2 3.3 0.2 0.9 0.5 1.5
Truck 9.4 4.6 6.4 7.0 5.9 4.6
For– hire truck 6.3 5.4 6.7 5.2 4.2 3.7
Private truck 10.6 5.4 4.4 3.3 2.8 1.5
Rail S 4.1 5.0 7.2 7.5 4.9
Water 0.7 S 5.4 S S S
Air (includes truck and air) S S S S S S
Pipeline S S S 2.1 S S
Multiple modes S S S S S S
Parcel, U.S.P.S. or courier 2.2 S
Other multiple modes S S S S S S
Other and unknown modes S S S S S S

Division 4.2, Spontaneously combustible materials

Hazard Class Division and Mode of Transportation Value (percent) Tons (percent) Ton-miles (percent)
2002 1997 2002 1997 2002 1997
All modes
Single modes 1.5 0.8 1.1 0.5 2.8 0.3
Truck 3.9 7.7 9.7 7.4 S 7.9
For– hire truck S 6.8 10.8 7.4 S 6.9
Private truck 9.9 4.5 9.0 2.1 S 1.2
Rail 2.9 7.7 S 7.5 13.1 7.8
Water
Air (includes truck and air) S S S S
Pipeline S S
Multiple modes 1.5 S 1.1 S S S
Parcel, U.S.P.S. or courier 1.5 S 1.1 S S S
Other multiple modes S S S S S S
Other and unknown modes S S S S S S

Division 4.3, Dangerous when wet materials

Hazard Class Division and Mode of Transportation Value (percent) Tons (percent) Ton-miles (percent)
2002 1997 2002 1997 2002 1997
All modes S S S
Single modes S 1.8 5.8 S S 0.8
Truck S 3.5 7.0 S S 6.2
For– hire truck S 5.4 S 15.6 S 7.0
Private truck 9.1 4.9 10.8 S S S
Rail S 3.9 S 5.9 S 6.2
Water S S S
Air (includes truck and air) S S S S S S
Pipeline S S
Multiple modes 3.3 S S S S S
Parcel, U.S.P.S. or courier S S S S S S
Other multiple modes S S S S S S
Other and unknown modes S S S S S S

Division 5.1, Oxidizers

Hazard Class Division and Mode of Transportation Value (percent) Tons (percent) Ton-miles (percent)
2002 1997 2002 1997 2002 1997
All modes
Single modes 2.0 0.7 1.7 1.0 2.4 0.7
Truck 5.2 5.6 6.6 4.5 8.5 6.0
For– hire truck 7.5 4.5 8.4 3.9 S 5.3
Private truck 7.7 3.0 6.2 3.2 2.7 1.3
Rail 5.2 5.6 6.5 4.6 8.8 5.9
Water S S S
Air (includes truck and air) S S S S
Pipeline S S
Multiple modes 1.8 0.5 S S S S
Parcel, U.S.P.S. or courier S S S S S
Other multiple modes 1.9 S S S S S
Other and unknown modes S 0.5 S S S S

Division 5.2, Organic peroxides

Hazard Class Division and Mode of Transportation Value (percent) Tons (percent) Ton-miles (percent)
2002 1997 2002 1997 2002 1997
All modes S S
Single modes 1.2 2.0 S 1.3 S 3.6
Truck S 2.0 S 1.3 S 3.6
For– hire truck S 6.6 S 6.8 S 8.4
Private truck S 7.0 14.5 7.3 11.8 S
Rail S S S
Water
Air (includes truck and air) S S S S S S
Pipeline S S
Multiple modes S S S S S S
Parcel, U.S.P.S. or courier S S S S S S
Other multiple modes S S S
Other and unknown modes S S S S S S

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.