BTS | Table B-7b. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Hazard Class Division and Mode of Transportation: 2002 and 1997

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BTS Home > Publications > Commodity Flow Survey > Hazardous Materials

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

Hazard class and mode of transporation	Value - CV		Value - Std. error of percent change	Tons - CV		Tons - Std. error of percent change	Ton–miles - CV		Ton–miles - Std. error of percent change	Average miles per shipment - CV		Average miles per shipment - Std. error of percent change
Hazard class and mode of transporation	2002	1997	Value - Std. error of percent change	2002	1997	Tons - Std. error of percent change	2002	1997	Ton–miles - Std. error of percent change	2002	1997	Average miles per shipment - Std. error of percent change
All modes	33.9	22.7	12.7	S	S	S	S	S	S	S	15.9	S
Single modes	33.5	22.8	12.3	S	S	S	S	S	S	S	16	S
Truck	33.5	22.7	17.5	S	38.3	S	S	S	S	S	16.4	S
For-hire truck	44.3	29.9	25.6	S	26.1	S	S	23.8	S	27.1	34.5	61.6
Private truck	S	16	S	S	S	S	S	S	S	39.1	21.4	16.6
Rail	–	S	S	–	S	S	–	S	S	–	27.6	–
Water	–	–	–	–	–	–	–	–	–	–	–	–
Air (includes truck and air)	–	S	S	–	S	S	–	S	S	–	31.6	–
Pipeline	–	–	–	–	–	–	S	S	S	S	S	S
Multiple modes	S	S	S	S	S	S	S	S	S	31.6	S	S
Parcel, U.S.P.S. or courier	S	S	S	S	S	S	S	S	S	31.6	S	S
Other multiple modes	–	–	–	–	–	–	–	–	–	–	–	–
Other and unknown modes	S	S	S	S	S	S	S	S	S	31.6	44	2.9

Division 1.2, Explosives with a projection hazard

Hazard class and mode of transporation	Value - CV		Value - Std. error of percent change	Tons - CV		Tons - Std. error of percent change	Ton–miles - CV		Ton–miles - Std. error of percent change	Average miles per shipment - CV		Average miles per shipment - Std. error of percent change
Hazard class and mode of transporation	2002	1997	Value - Std. error of percent change	2002	1997	Tons - Std. error of percent change	2002	1997	Ton–miles - Std. error of percent change	2002	1997	Average miles per shipment - Std. error of percent change
All modes	S	S	S	S	42.8	S	S	48.7	S	31.6	21.5	46.9
Single modes	S	S	S	S	42.8	S	S	48.7	S	31.6	21.6	47.8
Truck	S	S	S	S	43	S	S	49	S	31.6	21.5	47.7
For-hire truck	S	S	S	S	44	S	S	49	S	31.6	19.8	44.6
Private truck	–	S	S	–	S	S	–	S	S	–	31.6	–
Rail	–	–	–	–	–	–	–	–	–	–	–	–
Water	–	–	–	–	–	–	–	–	–	–	–	–
Air (includes truck and air)	–	S	S	–	S	S	–	S	S	–	31.6	–
Pipeline	–	–	–	–	–	–	S	S	S	S	S	S
Multiple modes	–	–	–	–	–	–	–	–	–	–	–	–
Parcel, U.S.P.S. or courier	–	–	–	–	–	–	–	–	–	–	–	–
Other multiple modes	–	–	–	–	–	–	–	–	–	–	–	–
Other and unknown modes	–	S	S	–	S	S	–	S	S	–	31.6	–

Division 1.3, Explosives with predominantly a fire hazard

Hazard class and mode of transporation	Value - CV		Value - Std. error of percent change	Tons - CV		Tons - Std. error of percent change	Ton–miles - CV		Ton–miles - Std. error of percent change	Average miles per shipment - CV		Average miles per shipment - Std. error of percent change
Hazard class and mode of transporation	2002	1997	Value - Std. error of percent change	2002	1997	Tons - Std. error of percent change	2002	1997	Ton–miles - Std. error of percent change	2002	1997	Average miles per shipment - Std. error of percent change
All modes	S	40.1	S	46.8	30.3	50.5	43.3	26.1	42.5	23.3	39.9	81.1
Single modes	S	44.2	S	46.8	30.5	66.4	43.3	28.2	52.4	23.3	19.5	32.8
Truck	S	44.4	S	S	30.5	S	47.9	28.2	50.4	23.5	20.4	34.4
For-hire truck	S	46.7	S	S	30.7	S	S	29.5	S	26.3	12.1	26.3
Private truck	S	41.7	S	S	S	S	S	S	S	40	27.4	34.8
Rail	S	–	S	S	–	S	S	–	S	31.6	–	–
Water	–	–	–	–	–	–	–	–	–	–	–	–
Air (includes truck and air)	S	S	S	S	S	S	S	S	S	31.6	29.8	42.5
Pipeline	–	–	–	–	–	–	S	S	S	S	S	S
Multiple modes	–	S	S	–	S	S	–	S	S	–	S	S
Parcel, U.S.P.S. or courier	–	S	S	–	S	S	–	S	S	–	S	S
Other multiple modes	–	–	–	–	–	–	–	–	–	–	–	–
Other and unknown modes	–	S	S	–	S	S	–	S	S	–	29.8	–

Division 1.4, Explosives with no significant blast hazard

Hazard class and mode of transporation	Value - CV		Value - Std. error of percent change	Tons - CV		Tons - Std. error of percent change	Ton–miles - CV		Ton–miles - Std. error of percent change	Average miles per shipment - CV		Average miles per shipment - Std. error of percent change
Hazard class and mode of transporation	2002	1997	Value - Std. error of percent change	2002	1997	Tons - Std. error of percent change	2002	1997	Ton–miles - Std. error of percent change	2002	1997	Average miles per shipment - Std. error of percent change
All modes	27.0	11.8	56.0	34.4	19.3	69.3	26.7	17.7	58.2	8.4	8.5	11.9
Single modes	28.1	12.5	69.7	35.0	19.8	74.5	27.4	18.1	63.0	12.1	17.0	29.0
Truck	27.8	7.2	79.9	35.1	18.3	80.6	27.5	17.7	75.2	11.8	22.1	42.1
For-hire truck	25.2	11.6	92.8	36.6	21.9	113.7	27.9	19.4	87.9	8.4	10.7	12.7
Private truck	S	26.6	S	41.7	28.4	14.6	S	38.4	S	32.9	18.1	47.0
Rail	S	S	S	S	S	S	S	S	S	31.6	25.9	13.1
Water	–	–	–	–	–	–	–	–	–	–	–	–
Air (includes truck and air)	S	35.5	S	49.7	32.1	27.6	S	29.9	S	16.3	10.0	22.2
Pipeline	–	–	–	–	–	–	S	S	S	S	S	S
Multiple modes	38.3	17.2	12.6	S	13.3	S	S	17.5	S	10.8	7.9	12.1
Parcel, U.S.P.S. or courier	38.3	17.4	12.7	S	13.2	S	S	16.8	S	10.8	7.9	12.1
Other multiple modes	–	S	S	–	S	S	–	S	S	–	31.6	–
Other and unknown modes	S	47.8	S	S	49.8	S	S	S	S	S	33.6	S

Division 1.5, Very insensitive explosives, blasting agent

Hazard class and mode of transporation	Value - CV		Value - Std. error of percent change	Tons - CV		Tons - Std. error of percent change	Ton–miles - CV		Ton–miles - Std. error of percent change	Average miles per shipment - CV		Average miles per shipment - Std. error of percent change
Hazard class and mode of transporation	2002	1997	Value - Std. error of percent change	2002	1997	Tons - Std. error of percent change	2002	1997	Ton–miles - Std. error of percent change	2002	1997	Average miles per shipment - Std. error of percent change
All modes	35.9	13.4	138.8	47.9	18.8	359.3	38.1	41.6	641.9	S	11.7	S
Single modes	35.9	13.4	138.7	47.9	18.8	361.2	38.1	41.9	648.6	S	11.8	S
Truck	36.5	13.4	133.1	49.3	18.8	340.5	38.1	41.9	447.4	32.6	11.8	47.4
For-hire truck	48.5	34.8	426.5	45.7	40.9	S	46.2	37.8	S	15.4	30.2	41.2
Private truck	39.2	13.5	128.3	S	20.1	S	45.7	S	S	49	14.5	50.6
Rail	44.9	–	–	41.6	–	–	44.6	–	–	24.2	–	–
Water	–	–	–	–	–	–	–	–	–	–	–	–
Air (includes truck and air)	S	–	S	S	–	S	S	–	S	28	–	–
Pipeline	–	–	–	–	–	–	S	S	S	S	S	S
Multiple modes	S	S	S	S	S	S	S	S	S	28.2	31.6	50.3
Parcel, U.S.P.S. or courier	S	–	S	S	–	S	S	–	S	28.2	–	–
Other multiple modes	–	S	S	–	S	S	–	S	S	–	31.6	–
Other and unknown modes	S	S	S	S	S	S	S	S	S	34.9	31.6	3.5

Division 2.1, Flammable gases

Hazard class and mode of transporation	Value - CV		Value - Std. error of percent change	Tons - CV		Tons - Std. error of percent change	Ton–miles - CV		Ton–miles - Std. error of percent change	Average miles per shipment - CV		Average miles per shipment - Std. error of percent change
Hazard class and mode of transporation	2002	1997	Value - Std. error of percent change	2002	1997	Tons - Std. error of percent change	2002	1997	Ton–miles - Std. error of percent change	2002	1997	Average miles per shipment - Std. error of percent change
All modes	10.6	10.2	20.5	10.5	5.5	18.0	14.1	11.0	35.5	33.4	20.6	69.6
Single modes	10.7	9.0	20.2	10.5	5.5	18.2	13.9	11.6	36.2	33.8	22.0	75.1
Truck	11.5	18.1	31.4	19.7	11.2	37.2	35.4	10.9	75.0	36.9	17.8	75.5
For-hire truck	24.9	11.8	43.6	29.7	18.1	49.7	49.5	17.0	109.7	20.3	15.1	32.0
Private truck	14.5	28.1	45.2	28.1	12.1	57.6	39.1	14.9	80.4	22.4	10.2	30.3
Rail	20.5	9.6	57.8	19.1	10.6	57.8	15.9	21.3	64.3	7.5	16.1	19.4
Water	43.1	19.6	66.7	37.8	28.1	69.5	32.7	43.3	62.4	32.4	30.1	31.5
Air (includes truck and air)	S	S	S	S	S	S	S	S	S	27.6	30.3	22.6
Pipeline	23.4	9.7	28.8	21.6	6.0	27.6	S	S	S	S	S	S
Multiple modes	33.8	34.8	27.1	44.4	32.6	61.0	49.3	39.6	165.5	17.5	S	S
Parcel, U.S.P.S. or courier	S	30.2	S	S	31.6	S	S	48.9	S	25.1	31.1	47.4
Other multiple modes	38.7	39.4	21.5	44.7	32.7	61.2	49.8	40.0	167.9	S	30.9	S
Other and unknown modes	S	49.7	S	32.7	47	8.9	38.7	S	S	S	S	S

Division 2.2, Nonflammable, nontoxic compressed gases

Hazard class and mode of transporation	Value - CV		Value - Std. error of percent change	Tons - CV		Tons - Std. error of percent change	Ton–miles - CV		Ton–miles - Std. error of percent change	Average miles per shipment - CV		Average miles per shipment - Std. error of percent change
Hazard class and mode of transporation	2002	1997	Value - Std. error of percent change	2002	1997	Tons - Std. error of percent change	2002	1997	Ton–miles - Std. error of percent change	2002	1997	Average miles per shipment - Std. error of percent change
All modes	11.8	4.9	27.4	36.7	15.4	77.3	29.6	24.8	63.9	38.9	14.3	62.6
Single modes	12.1	5.2	29.0	36.8	14.5	79.5	30.1	25.5	66.4	34.9	18.7	65.1
Truck	12.7	6.4	33.7	27.2	13.1	43.1	29.1	13.9	62.8	35.3	18.3	68.5
For-hire truck	24.3	11.8	80.2	43.9	20.3	76.1	31.3	12.1	84.5	13.2	11.5	24.2
Private truck	23.0	8.5	47.5	31.7	13.7	48.5	42.7	16.4	78.4	37.7	11.9	55.9
Rail	41.8	29.9	44.3	45.3	26.0	44.4	S	29.3	S	19.2	17.4	32.4
Water	S	S	S	S	S	S	S	S	S	31.7	29.3	3.1
Air (includes truck and air)	41.5	25.3	19.1	S	36.1	S	S	31.4	S	19.2	11.7	23.9
Pipeline	S	35.0	S	S	42.8	S	S	S	S	S	S	S
Multiple modes	29.4	20.2	72.3	40.2	S	S	S	45.2	S	32.1	23.9	62.1
Parcel, U.S.P.S. or courier	35.7	21.9	79.5	S	S	S	28.3	S	S	35.1	23.8	65.2
Other multiple modes	43.7	42.5	199.5	S	S	S	S	S	S	27.5	S	S
Other and unknown modes	37.0	26.4	26.8	29.5	S	S	S	S	S	S	S	S

Division 2.3, Gases toxic by inhalation

Hazard class and mode of transporation	Value - CV		Value - Std. error of percent change	Tons - CV		Tons - Std. error of percent change	Ton–miles - CV		Ton–miles - Std. error of percent change	Average miles per shipment - CV		Average miles per shipment - Std. error of percent change
Hazard class and mode of transporation	2002	1997	Value - Std. error of percent change	2002	1997	Tons - Std. error of percent change	2002	1997	Ton–miles - Std. error of percent change	2002	1997	Average miles per shipment - Std. error of percent change
All modes	11.8	21.0	28.3	13.9	14.5	22.3	11.3	27.1	19.3	27.3	32.2	54.4
Single modes	11.8	21.8	29.8	13.9	15.8	24.7	11.2	27.4	19.5	27.4	24.3	34.3
Truck	18.0	19.3	54.3	22.6	23.9	55.3	26.3	44.0	65.9	32.1	15.4	51.7
For-hire truck	29.8	38.3	92.2	35.3	43.4	80.8	35.7	S	S	30.3	21.9	43.0
Private truck	23.2	14.2	61.6	26.4	18.5	65.9	S	16.5	S	31.0	15.7	45.1
Rail	17.9	33.3	16.0	11.5	18.4	14.9	12.7	30.6	15.9	9.7	8.7	9.4
Water	S	41.4	S	S	41.9	S	S	41.0	S	31.8	26.6	18.7
Air (includes truck and air)	S	S	S	S	S	S	S	S	S	25.8	32.6	23.0
Pipeline	43.5	34.2	107.1	40.4	41.1	127.4	S	S	S	S	S	S
Multiple modes	S	S	S	S	S	S	S	S	S	41.9	29.8	20.6
Parcel, U.S.P.S. or courier	S	S	S	S	37.9	S	41.1	S	S	41.7	29.8	20.6
Other multiple modes	S	S	S	S	S	S	S	S	S	31.6	31.6	0.1
Other and unknown modes	44.1	47.1	26.1	S	S	S	46.5	S	S	S	S	S

Division 4.1, Flammable solids

Hazard class and mode of transporation	Value - CV		Value - Std. error of percent change	Tons - CV		Tons - Std. error of percent change	Ton–miles - CV		Ton–miles - Std. error of percent change	Average miles per shipment - CV		Average miles per shipment - Std. error of percent change
Hazard class and mode of transporation	2002	1997	Value - Std. error of percent change	2002	1997	Tons - Std. error of percent change	2002	1997	Ton–miles - Std. error of percent change	2002	1997	Average miles per shipment - Std. error of percent change
All modes	30.0	10.8	51.5	9.7	24.3	23.8	16.8	40.8	16.3	43.3	14.4	13.3
Single modes	32.6	12.2	52.1	9.7	24.6	24.2	16.9	41.5	16.7	S	15.3	S
Truck	38.9	15.0	62.6	7.1	4.9	11.7	24.7	18.9	32.8	S	19.5	S
For-hire truck	21.6	20.6	9.9	12.3	8.6	17.7	32.9	23.3	38.6	28.1	10.7	20.5
Private truck	46.1	22.5	177.2	21.7	25.4	89.8	18.7	30.8	62.1	S	28.2	S
Rail	S	41.3	S	26.5	40.6	23.0	20.4	43.8	13.1	14.8	18.8	14.8
Water	44.1	S	S	49.9	S	S	S	S	S	30.1	31.6	108.4
Air (includes truck and air)	S	S	S	S	S	S	S	S	S	25.4	26.8	51.8
Pipeline	S	S	S	S	46.4	S	S	S	S	S	S	S
Multiple modes	S	S	S	S	S	S	S	S	S	44.0	13.9	46.8
Parcel, U.S.P.S. or courier	39.7	S	S	46.8	42.8	8.4	48.5	47.5	9.9	20.7	13.7	21.7
Other multiple modes	S	S	S	S	S	S	S	S	S	31.1	32.7	132.3
Other and unknown modes	S	S	S	S	S	S	S	S	S	S	37.4	S

Division 4.2, Spontaneously combustible materials

Hazard class and mode of transporation	Value - CV		Value - Std. error of percent change	Tons - CV		Tons - Std. error of percent change	Ton–miles - CV		Ton–miles - Std. error of percent change	Average miles per shipment - CV		Average miles per shipment - Std. error of percent change
Hazard class and mode of transporation	2002	1997	Value - Std. error of percent change	2002	1997	Tons - Std. error of percent change	2002	1997	Ton–miles - Std. error of percent change	2002	1997	Average miles per shipment - Std. error of percent change
All modes	36.3	13.3	65.1	35.4	13.5	36.7	39.4	10.0	27.3	19.4	22.6	19.5
Single modes	37.7	13.5	64.5	35.6	13.7	36.8	39.8	9.9	26.9	23.9	37.5	21.7
Truck	39.6	20.6	116.2	43.3	25.2	55.2	S	18.3	S	24.4	39.1	27.8
For-hire truck	S	20.0	S	45.6	29.4	77.5	S	19.2	S	19.0	26.0	18.4
Private truck	20.9	37.5	103.9	27.2	21.3	12.8	S	24.6	S	21.1	44.4	32.5
Rail	36.9	16.6	16.1	S	13.5	S	43.1	13.9	18.5	25.8	4.8	13.8
Water	–	–	–	–	–	–	–	–	–	–	–	–
Air (includes truck and air)	S	S	S	S	45.3	S	S	48.5	S	28.7	27.4	68.1
Pipeline	–	–	–	–	–	–	S	S	S	S	S	S
Multiple modes	46.0	S	S	33.3	S	S	S	S	S	23.8	36.4	36.4
Parcel, U.S.P.S. or courier	46.2	S	S	33.8	S	S	S	S	S	23.8	35.6	41.2
Other multiple modes	S	S	S	S	S	S	S	S	S	30.1	29.0	44.2
Other and unknown modes	S	S	S	S	S	S	S	S	S	S	31.1	S

Division 4.3, Dangerous when wet materials

Hazard class and mode of transporation	Value - CV		Value - Std. error of percent change	Tons - CV		Tons - Std. error of percent change	Ton–miles - CV		Ton–miles - Std. error of percent change	Average miles per shipment - CV		Average miles per shipment - Std. error of percent change
Hazard class and mode of transporation	2002	1997	Value - Std. error of percent change	2002	1997	Tons - Std. error of percent change	2002	1997	Ton–miles - Std. error of percent change	2002	1997	Average miles per shipment - Std. error of percent change
All modes	S	24.7	S	42.8	S	S	S	23.8	S	17.6	15.5	18.1
Single modes	S	23.1	S	45.2	S	S	S	23.4	S	21.5	10.7	25.7
Truck	S	25.3	S	48	S	S	S	26.4	S	22.6	11.4	27.6
For-hire truck	S	21	S	S	22.4	S	S	26.4	S	21.5	7.7	27.6
Private truck	41.1	47.3	40.2	36.4	S	S	S	S	S	37.0	24.7	14.7
Rail	S	21.4	S	S	40.9	S	S	32.2	S	29.8	28.8	66.5
Water	–	S	S	–	S	S	–	S	S	–	30.8	–
Air (includes truck and air)	S	S	S	S	S	S	S	S	S	28.0	29.7	75.4
Pipeline	–	–	–	–	–	–	S	S	S	S	S	S
Multiple modes	46.0	S	S	S	S	S	S	S	S	29.9	24.0	12.7
Parcel, U.S.P.S. or courier	S	S	S	S	S	S	S	S	S	25.6	24.5	11.5
Other multiple modes	S	S	S	S	S	S	S	S	S	27.3	27.6	29.3
Other and unknown modes	S	S	S	S	S	S	S	S	S	S	44.8	S

Division 5.1, Oxidizers

Hazard class and mode of transporation	Value - CV		Value - Std. error of percent change	Tons - CV		Tons - Std. error of percent change	Ton–miles - CV		Ton–miles - Std. error of percent change	Average miles per shipment - CV		Average miles per shipment - Std. error of percent change
Hazard class and mode of transporation	2002	1997	Value - Std. error of percent change	2002	1997	Tons - Std. error of percent change	2002	1997	Ton–miles - Std. error of percent change	2002	1997	Average miles per shipment - Std. error of percent change
All modes	21.2	13.7	28.0	29.1	12.2	40.6	29.4	18.9	30.2	21.0	15.0	55.4
Single modes	21.8	14.0	28.7	29.1	12.1	40.2	30.0	19.0	29.5	17.3	16.0	49.3
Truck	25.3	14.5	37.3	37.0	14.2	61.9	47.2	19.3	77.8	19.3	16.3	56.2
For-hire truck	24.6	17.1	28.1	44.2	20.8	99.5	S	23.0	S	15.6	8.1	19.5
Private truck	40.5	13.8	77.7	32.2	12.8	36.9	21.5	16.1	19.4	19.4	20.4	34.4
Rail	41.0	40.2	37.9	24.2	21.2	24.5	22.1	26.1	15.7	16.8	11.4	14.6
Water	–	S	S	–	S	S	–	S	S	–	S	S
Air (includes truck and air)	S	S	S	49.7	45.4	S	S	S	S	31.3	30.9	57.9
Pipeline	–	–	–	–	–	–	S	S	S	S	S	S
Multiple modes	41.5	39.7	137.1	S	S	S	S	S	S	18.0	11.0	56.4
Parcel, U.S.P.S. or courier	S	S	S	S	S	S	S	40.2	S	25.1	11.7	78.8
Other multiple modes	49.3	S	S	S	S	S	S	S	S	S	25.3	S
Other and unknown modes	S	35.8	S	S	S	S	S	S	S	S	44.2	S

Division 5.2, Organic peroxides

Hazard class and mode of transporation	Value - CV		Value - Std. error of percent change	Tons - CV		Tons - Std. error of percent change	Ton–miles - CV		Ton–miles - Std. error of percent change	Average miles per shipment - CV		Average miles per shipment - Std. error of percent change
Hazard class and mode of transporation	2002	1997	Value - Std. error of percent change	2002	1997	Tons - Std. error of percent change	2002	1997	Ton–miles - Std. error of percent change	2002	1997	Average miles per shipment - Std. error of percent change
All modes	49.4	23.8	142.1	S	19.9	S	S	23.7	S	16.4	18.9	39.5
Single modes	49.7	24.5	146.6	S	20.0	S	S	24.7	S	17.6	16.4	35.4
Truck	S	24.5	S	S	20.0	S	S	24.7	S	17.7	21.3	46.3
For-hire truck	S	24.9	S	S	22.0	S	S	22.7	S	16.0	12.6	22.1
Private truck	S	43.4	S	44.1	41.2	31.3	49.5	S	S	31.7	13.7	16.7
Rail	S	–	S	S	–	S	S	–	S	30.1	–	–
Water	–	–	–	–	–	–	–	–	–	–	–	–
Air (includes truck and air)	S	S	S	S	S	S	S	S	S	31.6	31.6	15.2
Pipeline	–	–	–	–	–	–	S	S	S	S	S	S
Multiple modes	S	S	S	S	S	S	S	S	S	29.5	46.9	99.4
Parcel, U.S.P.S. or courier	S	S	S	S	S	S	S	S	S	29.5	41.3	93.4
Other multiple modes	–	S	S	–	S	S	–	S	S	–	31.6	–
Other and unknown modes	S	S	S	S	S	S	S	S	S	31.6	26.8	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.

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