BTS | Table B-6b. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Hazard Class and Mode of Transportation: 2002 and 1997

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BTS Home > Publications > Commodity Flow Survey > Hazardous Materials

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]

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Class 1, Explosives

Hazard class and mode of transporation	Value - CV		Value - Std. error of percent	Tons - CV		Tons - Std. error of percent	Ton–miles - CV		Ton–miles - Std. error of percent	Average miles per shipment - CV		Average miles per shipment - Std. error of percent
Hazard class and mode of transporation	2002	1997	Value - Std. error of percent	2002	1997	Tons - Std. error of percent	2002	1997	Ton–miles - Std. error of percent	2002	1997	Average miles per shipment - Std. error of percent
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

Hazard class and mode of transporation	Value - CV		Value - Std. error of percent	Tons - CV		Tons - Std. error of percent	Ton–miles - CV		Ton–miles - Std. error of percent	Average miles per shipment - CV		Average miles per shipment - Std. error of percent
Hazard class and mode of transporation	2002	1997	Value - Std. error of percent	2002	1997	Tons - Std. error of percent	2002	1997	Ton–miles - Std. error of percent	2002	1997	Average miles per shipment - Std. error of percent
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

Hazard class and mode of transporation	Value - CV		Value - Std. error of percent	Tons - CV		Tons - Std. error of percent	Ton–miles - CV		Ton–miles - Std. error of percent	Average miles per shipment - CV		Average miles per shipment - Std. error of percent
Hazard class and mode of transporation	2002	1997	Value - Std. error of percent	2002	1997	Tons - Std. error of percent	2002	1997	Ton–miles - Std. error of percent	2002	1997	Average miles per shipment - Std. error of percent
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

Hazard class and mode of transporation	Value - CV		Value - Std. error of percent	Tons - CV		Tons - Std. error of percent	Ton–miles - CV		Ton–miles - Std. error of percent	Average miles per shipment - CV		Average miles per shipment - Std. error of percent
Hazard class and mode of transporation	2002	1997	Value - Std. error of percent	2002	1997	Tons - Std. error of percent	2002	1997	Ton–miles - Std. error of percent	2002	1997	Average miles per shipment - Std. error of percent
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

Hazard class and mode of transporation	Value - CV		Value - Std. error of percent	Tons - CV		Tons - Std. error of percent	Ton–miles - CV		Ton–miles - Std. error of percent	Average miles per shipment - CV		Average miles per shipment - Std. error of percent
Hazard class and mode of transporation	2002	1997	Value - Std. error of percent	2002	1997	Tons - Std. error of percent	2002	1997	Ton–miles - Std. error of percent	2002	1997	Average miles per shipment - Std. error of percent
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)

Hazard class and mode of transporation	Value - CV		Value - Std. error of percent	Tons - CV		Tons - Std. error of percent	Ton–miles - CV		Ton–miles - Std. error of percent	Average miles per shipment - CV		Average miles per shipment - Std. error of percent
Hazard class and mode of transporation	2002	1997	Value - Std. error of percent	2002	1997	Tons - Std. error of percent	2002	1997	Ton–miles - Std. error of percent	2002	1997	Average miles per shipment - Std. error of percent
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

Hazard class and mode of transporation	Value - CV		Value - Std. error of percent	Tons - CV		Tons - Std. error of percent	Ton–miles - CV		Ton–miles - Std. error of percent	Average miles per shipment - CV		Average miles per shipment - Std. error of percent
Hazard class and mode of transporation	2002	1997	Value - Std. error of percent	2002	1997	Tons - Std. error of percent	2002	1997	Ton–miles - Std. error of percent	2002	1997	Average miles per shipment - Std. error of percent
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

Hazard class and mode of transporation	Value - CV		Value - Std. error of percent	Tons - CV		Tons - Std. error of percent	Ton–miles - CV		Ton–miles - Std. error of percent	Average miles per shipment - CV		Average miles per shipment - Std. error of percent
Hazard class and mode of transporation	2002	1997	Value - Std. error of percent	2002	1997	Tons - Std. error of percent	2002	1997	Ton–miles - Std. error of percent	2002	1997	Average miles per shipment - Std. error of percent
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

Hazard class and mode of transporation	Value - CV		Value - Std. error of percent	Tons - CV		Tons - Std. error of percent	Ton–miles - CV		Ton–miles - Std. error of percent	Average miles per shipment - CV		Average miles per shipment - Std. error of percent
Hazard class and mode of transporation	2002	1997	Value - Std. error of percent	2002	1997	Tons - Std. error of percent	2002	1997	Ton–miles - Std. error of percent	2002	1997	Average miles per shipment - Std. error of percent
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.

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