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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Interpretation Response #01-0089 ([Mr. David C. DeLuca])

Below is the interpretation response detail and a list of regulations sections applicable to this response.

Interpretation Response Details

Response Publish Date:

Company Name:

Individual Name: Mr. David C. DeLuca

Location State: PA Country: US

View the Interpretation Document

Response text:

JUN 20, 2001

Mr. David C. DeLuca                      Ref. No. 01-0089

2320 W. Columbia Street

Allentown, PA 18104

Dear Mr. DeLuca:

This responds to your letter dated April 9, 2001, regarding the applicability of the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180) to equipment installed and maintained as an integral part of a motor vehicle. Specifically, you inquire whether an after-market nitrous oxide system would be regulated under the HMR when installed in a privately owned automobile.

The answer is no. The HMR govern the transportation of hazardous materials in commerce. Equipment that is an integral part of a motor vehicle (e.g. fuel system, air bags, air conditioner, battery) and not being transported on a commercial transport vehicle is not considered to be in commerce and, therefore, is not subject to the HMR.

For information regarding motor vehicle regulations in the State of Maryland, we suggest you contact the Maryland Department of Transportation Motor Vehicle Administration at 1-800-248-4160.

I trust this satisfies your inquiry. Please contact us if we can be of further assistance.



Hattie L. Mitchell
Chief, Regulatory Review and Reinvention
Office of Hazardous Materials Standards


Regulation Sections

Section Subject
171.1 Applicability of Hazardous Materials Regulations (HMR) to persons and functions