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Section §173.5: Agricultural operations

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 173.5 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
19-0082 Thunder Creek Equipment Mr. Luke Van Wyk View
19-0022 Thunder Creek Equipment Luke Van Wyk View
160085R Office of Motor Vehicle Enforcement Captain Dean House View
14-0215 U.S. Environmental Protection Agency Ms. Nancy Fitz View
15-0005 Traffic Stripes, LLC. Mr. Paul Anderson View
16-0085R Office of Motor Vehicle Enforcement Captain Dean House View
99-0059 Illinois Department of Transportation Mr. Terrence J. Moore View
16-0002 Public Utilities Commission of Ohio Mr. Tom Forbes View
16-0118 Public Utilities Commission of Ohio Mr. Tom Forbes View
09-0250 Kansas Highway Patrol Mr. Rex Railsback View
16-0085 Office of Motor Vehicle Enforcemen Captain Dean House View
06-0008 North Carolina State Highway Patrol Captain George E. Gray, Jr View
03-0220 Minnesota Department of Transportation Mr. Michael Ritchie View