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


Section §172.516: Visibility and display of placards

Below are the available interpretations and guidance for the given section. To return to the list of parts, use the Parts link above. If you do not see any guidance or interpretation information below, that means there is none available for the given part/section. Return to the search page to browse additional regulations sections.

PHMSA has published several Frequently Asked Questions (FAQ) documents on regulatory topics. Please review our FAQ documents below:

Additionally PHMSA has Hazardous Materials FAQs based on letters of interpretation on the following topics:

This section of the website provides the ability to find regulations information including regulations parts, content of sections, and interpretations for regulations sections. Below is a list of parts, identified by the part number and subject. To browse sections by part, click on the subject link below. You will be taken to the eCFR website to view sections for a part.

A written regulatory interpretation, response to a question, or an opinion concerning a pipeline safety issue may be obtained by submitting a written request to the Office of Pipeline Safety (PHP–30), PHMSA, U.S. Department of Transportation, 1200 New Jersey Avenue SE., Washington, DC 20590–0001 or at the email address: In addition to email address, the requestor must include his or her return address and should also include a daytime telephone number. Requests should be submitted at least 120 days before the time the requestor needs a response.

Note: electronic submission is provided as alternative to the 49 CFR Part 190.11(b) mail-in requirement.

The regulations text of the section can be found on the eCFR website. To view the regulations text, use the link below. For assistance, please send an email to

View section 172.516 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
22-0139 WM Pacific Northwest Haydon Morris View
22-0069 Senergy Petroleum Mr. Deven Hallen View
16-0166R Haliburton HRD Albert R. Vandeaver View
22-0015 ICE Service Group & SPS Packaging Systems Kurt Colborn View
21-0112 Sheetz, Inc. Roy Terwilliger View
21-0077 Oak Harbor Freight Lines, Inc. Jeff McLaughlin View
20-0025 Entergy Donnie James View
20-0014 Reagent Chemical & Research Inc. Robert Dritschel View
20-0003 Texas Department of Public Safety Corporal Casey Jones View
19-0124 Dru Chem Inc. Bill Krause View
19-0087 US Ecology, Inc. Michael Herron View
02-0263 CHS Cooperatives John R. Macpherson View
15-0076 The Lane Construction Corporation Ms. Michele Jacobs View
05-0158 Georgia Gulf Sulfur Mr. Jerry J. Jennett View
06-0108 Con-way Mr. Robert Petrancosta  View
09-0109 Southern Resin, Inc. Mr. Allen Grubb View
06-0074 Hyundai America Shipping Agency Mr. Herb Giles View
12-0220 Mr. Aaron Dills View
15-0224 Schneider National Bulk Carriers Ms. Shannon Schick View
16-0166 Halliburton Mr. Albert Vandeaver View
05-0276 Mr. John Stolpe View
13-0005 ATDynamics, Inc. Mr. Jeff Grossmann View
12-0184 Ms. Shari Ann Fry View
10-0247 View
14-0106 J.B, Hunt Transport, INC Mr. James Cherry View
10-0254 Department of California Highway Patrol Captain Steve Dowling View
14-0183 Denton Police Department Mr. William Burson View
99-0216 American Trucking Associations Mr. Paid Bomgardner View
PI-11-0100 New Penn Motor Express Mr. Thomas Gerhold View
08-0131 Allied Universal Corporation Ms. Robin E. Botle View
00-0192 Department of Public Safety Mr. C.D. Lavender View
12-0094 Big Creek Media Mr. Nelson Lemmond View
98-0426 American Crop Protection Association Mr. Thomas J. Gilding View
10-0126 Minnesota Department of Transportation Mr. Michael Ritchie View
05-0063 A. Duie Pyle, Inc. Mr. Rich K. Kaczynski View
04-0196 Hyundai America Mr. Herbert Giles View
16-0035 SJ Transportation Co. Inc. Ms. Maureen Poole View
99-0025 Industrial Consulting Services Mr. Randy L. Holloway View
12-0182 ChemPura Pools, Ltd. Mr. David Brady View
07-0071 PCS Sales, (USA) Inc Ms. Tracey G. Smith View
17-0034 R&R Trucking, AATCO, NEI Mr. David Vargyas View
08-0098 HazMat Resources, Inc. Mr. Danny Shelton View
04-0164 Southern Service Center Mr. Charles Phillips View
05-0309 AMCOM, U.S. Army Garrison Mr. Richard E. Eads View
09-0039 HazMat Resources, Inc. Mr. Danny Shelton View
09-0055 MCSAP, Troop I, Olathe Mr. Rex Railsback View
10-0075 Landstar Transportation Logistics Mr. Wes Pace View
16-0004 Texas Department of Public Safety Trooper Kelley F. McClatchy View
11-0079 Mr. Roger W. Cooper View
07-0058 Approved Fire Protection Company Robert Bailey View
16-0004 Texas Department of Public Safety Trooper Kelly F. McClatchy View