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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
What are the lighting requirements when a tow truck is pulling a wrecked or disabled vehicle? FMCSA-VEH-393.17-Q01
The Federal Motor Carrier Administration (FMCSA)regulations are written on an annual calendar year basis. Will foreign motor carriers, using this system, work from July 1 to June 30, or is everything to be managed on a six-month basis for the first year a FMCSA-D&A-382.403-Q01 Drug & Alcohol Test Results Reporting
Is the vacuum portion of vacuum-assisted hydraulic brake systems required to have a warning device? FMCSA-VEH-393.51-Q02 Does vacuum assist on hydraulic brakes need a warning device?
Do tires marked ‘‘NHS’’ (not for highway service) mean that highway use is prohibited by § 393.75? FMCSA-VEH-393.75-Q04 Use of tires not for highway service on the highway
Driver vehicle inspection reports FMCSA-VM-396.11-Q007 Driver vehicle inspection reports
Does a periodic inspection decal exempt a CMV from roadside inspection? FMCSA-VM-396.17-Q08.cm Does a periodic inspection decal exempt a CMV from roadside inspection?
Question 1: What is meant by ‘‘systematic inspection, repair, and maintenance?” FMCSA-VM-396.3-Q001 Vehicle inspection, repair and maintenance
Would the accident report retention requirement in §390.15(b)(2) include an ‘‘Adjuster’s Report’’ that is normally considered to be an internal document of an insurance company? FMCSA-RG-390.15-Q002 Retention of insurance “adjuster’s report”
Are mobile cranes operating in interstate commerce considered CMVs, and are they subject to the FMCSRs? FMCSA-RG-390.5T-Q009 Are mobile cranes CMVs subject to the FMCSRs?
If an interstate driver tests positive for alcohol or controlled substances under part 382, must the driver be medically re-examined and obtain a new medical examiner’s certificate to drive again? FMCSA-MED-391.41-Q5 Driver Physical Qualification Standards