USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

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

Interpretation Response #00-0252 ([Mr. Thomas Dutkiewicz])

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. Thomas Dutkiewicz

Location State: CT Country: US

View the Interpretation Document

Response text:

September 21, 2000


Mr. Thomas Dutkiewicz                     Ref. No. 00-0252
40 Central Street
Forestville, CT 06010

Dear Mr. Dutkiewicz:

This is in response to your September 15, 2000, letter regarding placarding provisions in §§ 172.502 and 172.504(f)(2) of the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180).  Your questions are paraphrased and answered as follows:

Q1:      What does the term "permissive placarding" mean as specified in 9 172.502(c)?

Al:        "Permissive placarding" as referenced in § 172.502(c) allows the display of placards for a hazardous material, even when not required, if the placards represent the hazard of the material and otherwise conform to the requirements in Part 172, Subpart F.

Q2:      Section 172.504(f)(2) allows the use of FLAMMABLE placards in place of COMBUSTIBLE placards on a cargo tank or portable tank containing a combustible liquid.  May COMBUSTIBLE placards be displayed on a cargo tank filled with a flammable liquid?

A2:      The answer is no.  A COMBUSTIBLE placard may not be used in place of a FLAMMABLE placard for a cargo tank carrying flammable liquids.

I hope this satisfies your request.


John A. Gale
Transportation Regulations Specialists
Office of Hazardous Materials Standards


Regulation Sections

Section Subject
172.502 Prohibited and permissive placarding