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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
If (1) a driver has a verified positive test result for controlled substances or an alcohol concentration of 0.04 or greater and (2) the driver subsequently obtains a verified negative result for controlled substances or a test result of less than 0.04 al FMCSA-D&A-382.503-FAQ001 Guidance on whether employer may accept subsequent test results
§385.1 Who must hold a safety permit. FMCSA-HMSP-385.403-Q001 Hazardous Materials Safety Permits
Part 387 Section § 387.39: Forms. FMCSA-INS-387.39-Q001 Aggregation of insurance to meet financial responsibility requirements
What level of insurance is required for a carrier operating a multi-compartment cargo tank that is transporting a hazardous substance, where each compartment is less than 3,500 water gallon capacity, and the total capacity is greater than 3,500 water gall FMCSA-INS-387.9-Q004 Insurance requirements for multi-compartment cargo tanks
Part 387 Section § 387.27: Applicability. FMCSA-INS-387.27-Q006 Applicability of Financial Responsibility regulations to school buses used by the federal government of Mexico
What determines the level of coverage required for a passenger carrier: the number of passengers or the number of seats in the vehicle? FMCSA-INS-387.27-Q002(2020-02-28)-CORR1 How passenger carrier financial responsibility requirements are determined
Are motor vehicles being transported considered to be HM for purposes of the financial responsibility requirements, thus requiring the higher limits set forth in the regulations? FMCSA-INS-387.3-Q008 Whether motor vehicles being transported are considered hazardous materials for purposes of the financial responsibility requirements
Are motor carriers transporting HM that are covered under exceptions to the HMRs subject to financial responsibility regulations? FMCSA-INS-387.3-Q007 Applicability of Financial Responsibility Regulations to motor carrier transporting hazardous materials under exceptions to the HMRs
May a motor carrier create an accident register of its own, or is there a specified form that must be used? FMCSA-RG-390.15-Q001 Format of accident register
What is the applicability of the FMCSRs to school bus operations performed by Indian Tribal Governments? FMCSA-RG-390.3T-Q012 Applicability of FMCSRs to Indian school bus operations