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MODAL BREAKDOWN OF HAZARDOUS MATERIALS INCIDENTS
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Hazardous Materials Incidents by Mode (monthly data, not seasonally adjusted)
All 2002 data are preliminary
Hazardous Materials Incidents by Mode (monthly data, not seasonally adjusted)
All 2002 data are preliminary
Most reported releases of hazardous materials occur on the highways.
| Highway |
1,614 |
1,193 |
| Highway percent change from same month previous year |
16.62 |
-26.08 |
| Air |
109 |
74 |
| Air percent change from same month previous year |
-25.34 |
-32.11 |
| Rail |
80 |
68 |
| Rail percent change from same month previous year |
-6.98 |
-15.00 |
| Waterborne (not including bulk shipments) |
0 |
0 |
| Waterborne percent change from same month previous year |
(--) |
(--) |
* Preliminary estimates.
NOTE: The current value is compared to the value from the same period in the
previous year to account for seasonality.
Incident reporting requirements were extended to intrastate motor carriers
on October 1, 1998, which may partly explain the subsequent increased volume of
reports. Beginning in April 1993, there was sharp improvement in reporting of
incidents by small package carriers.
A reported incident is a report of any unintentional release of hazardous material
while in transportation (including loading, unloading, and temporary storage).
It excludes pipeline and bulk shipments by water, which are reported separately.
A trendline has been provided for highway incidents. The trend has been calculated
through a statistical procedure called Structural Modeling, in which the time
series under study is decomposed into seasonal, trend and irregular components.
For further information on this statistical procedure, see: S.J. Koopman, et al.,
Structural Time Series Analyser, Modeller and Predictor (STAMP), London:
Timberlake Consultants Ltd., 2000.
SOURCE: U. S. Department of Transportation, Research and Special Program Administration,
Office of Hazardous Materials, Planning and Analysis, Hazardous Materials Information
System data obtained through personal communication.
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