MODAL BREAKDOWN OF HAZARDOUS MATERIALS INCIDENTS

MODAL BREAKDOWN OF HAZARDOUS MATERIALS INCIDENTS

Hazardous Materials Incidents by Mode (monthly data, not seasonally adjusted)

Hazardous Materials Incidents by Mode (monthly data, not seasonally  adjusted). Highway and Air Incidents. If you are a user with a disability and cannot view this image, please call 800-853-1351 or email answers@bts.gov for further assistance.

All 2001 data are preliminary

Hazardous Materials Incidents by Mode (monthly data, not seasonally adjusted)

Hazardous Materials Incidents by Mode (monthly data, not seasonally  adjusted). Rail and Waterborne Incidents. If you are a user with a disability and cannot view this image, please call 800-853-1351 or email answers@bts.gov for further assistance.

All 2001 data are preliminary

Most reported releases of hazardous materials occur on the highways.

Hazardous Materials Incidents by mode    May-00       May-01*   
Highway 1,384  1,502
Highway percent change from same month previous year 23.68   8.53
Air   146    109
Air percent change from same month previous year  2.10 -25.34
Rail    86     74
Rail percent change from same month previous year  2.38 -13.95
Waterborne (not including bulk shipments)     0      0
Waterborne percent change from same month previous year  0.00   0.00

* Preliminary estimates

NOTE: The current value is compared to the value from the same period in the previous year to account for seasonality.

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: Timber-lake Consultants Ltd. , 2000

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.

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.