BTS | Table B-1b. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Mode of Transportation: 2002 and 1997

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BTS Home > Publications > Commodity Flow Survey > Hazardous Materials

Table B-1b. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by 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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Mode of transportation	Value			Tons			Ton–miles			Average miles per shipment
Mode of transportation	CV 2002	CV 1997	Std. error of percent change	CV 2002	CV 1997	Std. error of percent change	CV 2002	CV 1997	Std. error of percent change	CV 2002	CV 1997	Std. error of percent change
All modes	3.0	3.4	5.7	4.2	2.8	6.2	4.4	5.5	7.8	7.1	7.6	12.9
Single modes	3.1	3.4	5.8	4.2	2.8	6.2	4.9	5.7	8.5	6.1	6.7	10.6
Truck	3.7	3.5	6.5	4.6	4.5	7.8	7.0	8.5	14.8	6.3	5.0	10.0
For–hire truck	5.2	6.3	10.8	6.2	7.5	11.8	9.4	12.7	20.9	7.4	5.5	10.4
Private truck	4.8	3.1	7.4	5.3	3.3	7.7	7.9	9.0	16.6	5.3	4.1	7.2
Rail	7.7	15.5	15.5	6.6	8.9	11.9	5.8	12.2	12.4	2.6	6.0	5.4
Water	12.5	11.3	23.9	14.3	13.2	26.5	12.0	14.5	21.0	S	S	S
Air (includes truck and air)	20.7	46.4	9.7	38.0	19.2	37.2	39.2	20.1	37.3	8.2	3.5	12.8
Pipeline	6.6	5.1	11.2	7.0	6.3	11.9	S	S	S	S	S	S
Multiple modes	14.9	11.1	24.8	24.3	25.4	53.8	19.9	S	S	12.8	8.9	20.3
Parcel, U.S.P.S. or courier	14.6	11.6	25.0	20.2	25.3	39.3	13.0	16.4	26.6	13.2	8.1	18.6
Other multiple modes	23.6	14.5	37.0	24.7	25.6	54.6	20.1	S	S	22.6	44.0	404.9
Other and unknown modes	18.7	12.5	15.1	19.0	9.5	15.7	46.0	20.4	62.5	39.0	33.1	88.6

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.
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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