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Regulatory Guidance

Welcome to the FMCSA Guidance Portal. This web portal is a searchable, indexed database that contains and links to all guidance documents in effect from the Federal Motor Carrier Safety Administration. The guidance documents lack the force and effect of law, unless expressly authorized by statute or incorporated into a contract.

To comment on any guidance document, or to request issuance, reconsideration, modification, or rescission of any guidance document, please identify the guidance document in your request and send it to: FMCSAguidance@dot.gov. NOTE: The FMCSAguidance mailbox is not intended to serve as a mailbox for general inquiries. For inquiries that go beyond the limited purpose of the FMCSAguidance mailbox, please call FMCSA's Information Line (800-832-5660) or visit FMCSA's "Contact Us" page to send your inquiry to the appropriate mailbox.

Subject Agency Identifier Topic Issued Date
Is the low pressure warning device required to activate before the tractor protection valve? FMCSA-VEH-393.51-Q01 Must the low-pressure warning device activate before the tractor protection valve?
Do school buses which meet the school bus emergency exit requirements established by NHTSA’s November 2, 1992, final rule on FMVSS No. 217 have to be retrofitted with additional emergency exits when used in interstate commerce for non-school bus operation FMCSA-VEH-393.62-Q03 Must school bus emergency exits be retrofitted for non-school operations?
May tires be filled with materials other than air (e.g., silicone, polyurethane)? FMCSA-VEH-393.75-Q03 Filling tires with material other than air
May more than one power unit be included on the DVIR if two or more power units were used by a driver during one day’s work? FMCSA-VM-396.11-Q003 Driver vehicle inspection reports
Question 25: Section 396.11 requires the driver, at the completion of each day’s work, to prepare a written report on each vehicle operated that day. Does this section require a ‘‘post trip inspection’’ of the kind described in § 396.15? FMCSA-VM-396.11-Q025 Driver vehicle inspection reports
Are drivers required to draw continuous lines between the off-duty, sleeper berth, driving, and on-duty (not driving) lines on a record of duty status when changing their duty status? FMCSA-HOS-395.8-Q13 Hours of Service Records of Duty Status
When must a contract school bus operator comply with part 387? FMCSA-INS-387.27-Q004 Contract school bus operator compliance with Part 387 Subpart B
What protection is afforded a driver for refusing to violate the FMCSRs? FMCSA-RG-390.3T-Q017 Protection of drivers sanctioned for refusal to violate FMCSRs
§391.11 General qualifications of drivers. FMCSA-DQ-391.11-Q005 General driver qualifications
If an interstate driver gets stopped by a State enforcement officer for an inspection, would the inspecting officer be enforcing the Federal regulations or State regulations? FMCSA-RG-390.9-Q001 Regulations enforced by State officers