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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
Are drivers required to be dedicated permanently to the oilfield industry? FMCSA-HOS-395.1-Q09 Hours of Service Exceptions
May sleeper berth time and off-duty periods be combined to meet the 10-hour off-duty requirement? FMCSA-HOS-395.1-Q25 Hours of Service Exceptions
Question 16: Can an SAP recommend that six follow-up tests be conducted in less than six months and then be suspended after all six are conducted? FMCSA-D&A-382.605-Q16 Drug & Alcohol Testing – Follow-up Testing Period
How many times may a motor carrier relieve a driver from duty within a tour of duty? FMCSA-HOS-395.2-Q23 Hours of Service Definitions
Must an SAP evaluation be conducted in person or may it be conducted telephonically? FMCSA-D&A-382.605-Q1 Controlled Substances and Alcohol Use and Testing, Referral, Evaluation, Treatment
Must drivers, alternating between interstate and intrastate commerce, record their intrastate driving time on their record of duty status? FMCSA-HOS-395.8-Q04 Hours of Service Records of Duty Status
If a company owns more than one motor carrier subject to the Federal Motor Carrier Safety Regulations, may the company use logs listing the names of all such motor carrier employers and require the driver to identify the carrier for which he or she drives FMCSA-HOS-395.8-Q18 Hours of Service Records of Duty Status
Are Red Cross vehicles/drivers subject to the FMCSRs? FMCSA-RG-390.3T-Q007 Applicability of FMCSRs to Red Cross vehicles
Do electronic devices which are advertised as radar jammers meet the definition of a radar detector in 49 CFR 390.5T? FMCSA-RG-390.5T-Q021 Radar jammers as radar detectors
Question 3: Is a motor carrier required to accept a certificate from the driver’s regularly employing motor carrier certifying that the driver is qualified per §391.65? FMCSA-DQ-391.65-Q003 Drivers furnished by other motor carriers