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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
May the driver combine the two sleeper berth periods to meet the required 10 consecutive hours of off-duty time per §395.1(g), then drive for up to 11 more hours? FMCSA-HOS-395.1-Q27 Hours of Service Exceptions
A motor carrier relieves a driver from duty. What is a suitable facility for resting? FMCSA-HOS-395.2-Q22 Hours of Service Definitions
May a properly vented fuel cap be used on a fuel tank equipped with another fuel venting system? FMCSA-VEH-393.67-Q01 Topic: Use of vented fuel cap in addition to other fuel system
If a CMV, other than a motor coach, is equipped with a passenger seat, is a seat belt required for the passenger seat? FMCSA-VEH-393.93-Q01 Seat belt for truck passenger seats
(395.8-Q12) FMCSA-HOS-395.8-Q12 Hours of Service Records of Duty Status
Driver Vehicle Inspection Reports FMCSA-VM-396.11-Q017 Driver vehicle inspection report
Question 2: May a driver who does not have the necessary experience perform the adjustment under directions issued by telephone by a qualified inspector? FMCSA-VM-396.25-Q02.cm May driver adjust brakes under hone directions from qualified inspector?
May a driver operating a CMV under a lease arrangement with a motor carrier, after being placed out of service for an hours of service violation, cancel the lease and continue to operate the vehicle as a private personal conveyance? FMCSA-HOS-395.13-Q02 Lease arrangements and out of service declarations
Are personnel involved in road testing CMVs across a State line subject to the FMCSRs? FMCSA-RG-390.3T-Q005 Applicability of FMCSRs to persons road testing CMVs
What is the meaning of ‘‘immediate’’ as used in the definition of ‘‘accident?’’ FMCSA-RG-390.5T-Q019 Meaning of “immediate” medical treatment after “accident”