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Table B-6c. Estimated Standard Error of Percentage for Hazardous Material Shipment Characteristics by Hazard Class 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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Class 1, Explosives

Hazard Class and Mode of Transportation Value Tons Ton–miles
2002 1997 2002 1997 2002 1997
All modes – – – – – S
Single modes 1.8 1.7 0.2 0.6 0.4 S
Truck 2.5 4.4 3.2 9.0 5.5 15.1
For–hire truck 4.4 4.0 12.0 5.5 9.6 13.4
Private truck 3.9 3.4 S 7.5 5.6 S
Rail 1.8 4.3 3.1 S 5.6 S
Water – – – – – –
Air (includes truck and air) S 1.1 – – 0.6 0.1
Pipeline – – – – S S
Multiple modes 1.8 1.6 S 0.4 S 1.1
Parcel, U.S.P.S. or courier 1.8 1.6 S 0.3 S 1.1
Other multiple modes – S – S – S
Other and unknown modes S S S S S S

Class 2, Gases

Hazard Class and Mode of Transportation Value Tons Ton–miles
2002 1997 2002 1997 2002 1997
All modes – – – – – –
Single modes 0.5 0.8 0.1 1.2 0.3 0.7
Truck 4.4 1.8 5.9 1.5 4.5 2.0
For–hire truck 3.6 1.5 2.9 2.0 3.7 1.6
Private truck 4.0 2.9 5.7 1.9 5.1 1.8
Rail 1.8 1.8 2.4 1.3 4.7 3.4
Water 0.6 0.5 1.6 0.9 1.5 3.6
Air (includes truck and air) 0.1 0.3 S – S –
Pipeline 3.6 2.3 5.8 2.3 S S
Multiple modes 0.4 0.2 0.1 0.1 0.3 0.2
Parcel, U.S.P.S. or courier 0.4 0.1 S S – S
Other multiple modes – 0.1 0.1 0.1 0.3 0.2
Other and unknown modes 0.2 0.8 – S – 0.7

Class 3, Flammable Liquids

Hazard Class and Mode of Transportation Value Tons Ton–miles
2002 1997 2002 1997 2002 1997
All modes – – – – – –
Single modes 0.2 0.3 0.2 0.3 1.3 4.2
Truck 1.4 2.0 1.1 2.1 2.8 3.7
For–hire truck 1.4 1.1 0.8 1.3 3.0 2.2
Private truck 1.6 1.4 1.3 1.3 1.1 1.8
Rail 0.2 0.3 0.1 0.2 1.8 1.9
Water 1.2 0.8 1.7 1.1 2.9 2.9
Air (includes truck and air) – S S – S –
Pipeline 1.4 1.2 1.6 1.8 S S
Multiple modes 0.3 0.2 0.2 0.2 1.3 S
Parcel, U.S.P.S. or courier 0.1 – – – – –
Other multiple modes 0.2 0.2 0.2 0.2 1.3 S
Other and unknown modes 0.2 0.2 0.1 0.1 S 0.1

Class 4, Flammable Solids

Hazard Class and Mode of Transportation Value Tons Ton–miles
2002 1997 2002 1997 2002 1997
All modes – – – – – –
Single modes 5.4 1.3 0.3 0.8 0.8 1.3
Truck 7.6 2.4 5.7 6.8 6.4 4.3
For–hire truck 7.8 4.0 6.3 5.3 6.9 3.6
Private truck 7.1 3.7 4.0 S 1.8 1.5
Rail 4.3 2.9 3.7 6.8 6.2 4.6
Water 0.4 S 5.1 S S S
Air (includes truck and air) S 0.2 S S S S
Pipeline S S S 1.5 S S
Multiple modes S 1.4 S S S S
Parcel, U.S.P.S. or courier 1.3 S – – S –
Other multiple modes S S S S S S
Other and unknown modes S 0.6 S S S 0.1

Class 5, Oxidizers and organic peroxides

Hazard Class and Mode of Transportation Value Tons Ton–miles
2002 1997 2002 1997 2002 1997
All modes – – – – – –
Single modes 1.4 0.6 1.3 1.0 1.9 0.7
Truck 4.6 5.4 6.7 4.5 8.6 6.0
For–hire truck 6.4 4.3 7.7 3.8 9.5 5.3
Private truck 5.4 2.6 5.1 3.1 2.1 1.2
Rail 4.9 5.4 6.7 4.5 9.1 5.9
Water – S – S – S
Air (includes truck and air) S – – S S S
Pipeline – – – – S S
Multiple modes 1.2 0.5 S S S S
Parcel, U.S.P.S. or courier S S S – S –
Other multiple modes 1.2 0.4 S S S S
Other and unknown modes S 0.5 S S S S

Class 6, Toxic (poison)

Hazard Class and Mode of Transportation Value Tons Ton–miles
2002 1997 2002 1997 2002 1997
All modes – – – – – –
Single modes 2.8 1.3 2.7 0.7 1.9 1.4
Truck 2.9 2.6 5.2 3.4 6.1 2.4
For–hire truck 3.7 3.0 3.6 3.1 5.2 2.3
Private truck 3.5 4.8 2.5 3.0 1.0 1.1
Rail 2.4 1.4 5.6 2.9 6.0 3.9
Water 4.0 S 8.5 S S S
Air (includes truck and air) S 0.3 S S S S
Pipeline S 0.5 6.5 1.6 S S
Multiple modes S 1.3 S 0.6 S S
Parcel, U.S.P.S. or courier 1.2 1.0 S – S –
Other multiple modes S 0.3 S 0.6 S S
Other and unknown modes S 0.6 S 0.5 1.0 0.2

Class 7, Radioactive materials

Hazard Class and Mode of Transportation Value Tons Ton–miles
2002 1997 2002 1997 2002 1997
All modes – – – – – –
Single modes 5.3 3.5 2.4 3.1 5.0 8.1
Truck 8.5 7.4 2.1 4.9 6.8 13.6
For–hire truck 11.1 4.3 12.6 7.0 9.0 12.2
Private truck 8.7 7.0 11.7 6.4 S S
Rail – S – S – S
Water – – – – – –
Air (includes truck and air) 7.6 5.2 1.7 2.1 7.0 5.4
Pipeline – S – S S S
Multiple modes 5.3 4.0 2.5 3.4 5.0 8.5
Parcel, U.S.P.S. or courier 5.3 4.0 2.5 3.4 5.0 8.5
Other multiple modes – – – – – –
Other and unknown modes S S S S S S

Class 8, Corrosive materials

Hazard Class and Mode of Transportation Value Tons Ton–miles
2002 1997 2002 1997 2002 1997
All modes – – – – – –
Single modes 0.8 1.0 0.5 1.1 1.1 0.8
Truck 1.4 2.3 1.8 3.7 3.9 3.6
For–hire truck 3.3 2.6 2.8 3.0 4.6 3.3
Private truck 3.1 2.8 1.3 2.8 1.0 1.4
Rail 1.1 1.7 2.5 3.0 4.4 4.6
Water 0.7 2.5 2.0 5.0 2.8 7.0
Air (includes truck and air) 0.1 0.1 S – S –
Pipeline 0.2 S 1.4 0.5 S S
Multiple modes 0.4 0.6 0.3 0.2 1.1 0.4
Parcel, U.S.P.S. or courier 0.4 0.5 S – S –
Other multiple modes 0.2 0.3 0.3 0.2 1.1 0.4
Other and unknown modes S 0.7 0.3 0.9 0.2 S

Class 9, Miscellaneous dangerous goods

Hazard Class and Mode of Transportation Value Tons Ton–miles
2002 1997 2002 1997 2002 1997
All modes – – – – – –
Single modes 1.9 1.9 0.9 0.4 1.6 0.8
Truck 4.6 3.5 6.5 4.5 4.5 5.7
For–hire truck 5.3 3.2 4.8 4.4 2.5 5.3
Private truck 5.8 2.8 4.7 3.4 3.8 1.5
Rail 2.3 3.7 3.5 3.9 5.4 5.5
Water 2.3 S 5.3 S 6.3 S
Air (includes truck and air) 1.2 0.4 S – S –
Pipeline S S S S S S
Multiple modes 1.8 1.3 S 0.3 1.6 0.8
Parcel, U.S.P.S. or courier 1.0 1.0 – – – –
Other multiple modes 1.1 0.5 S 0.3 1.6 0.8
Other and unknown modes 0.3 S S S S S

KEY:
– Represents and 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.

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.
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