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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
How should time spent in transit on a ferry boat be recorded? FMCSA-HOS-395.2-Q12
Does § 393.83 specify the type of exhaust system, vertical or horizontal, to be used on trucks or truck tractors? FMCSA-VEH-393.83-Q02 Vertical vs. horizontal exhaust systems
How many miles may a driver record on his/her daily record of duty status and still be presumed to be in compliance with the speed limits? FMCSA-DRV-392.6-Q001 Compliance with speed limits
Does off-road motorized construction equipment meet the definitions of "motor vehicle" and "commercial motor vehicle" as used in §§ 383.5 and 390.5T? FMCSA-RG-390.5T-Q007 Applicability of FMCSRs to off-road motorized construction equipment
Does the FMCSA define for-hire transportation of passengers the same as the former ICC did? FMCSA-RG-390.5T-Q010 For-hire transportation of passengers
§391.15 Disqualification of drivers. FMCSA-DQ-391.15-Q001 Driver disqualification
Question 1: What protection is afforded a driver for refusing to violate the Federal Motor Carrier Safety Regulations (FMCSRs)? FMCSA-DRV-392.3-Q001 Ill or fatigued driver
Must a person who is injured in an accident and immediately receives treatment away from the scene of the accident be transported in an ambulance? FMCSA-RG-390.5T-Q018 Mode of transportation of persons injured in CMV accident
§391.15 Disqualification of drivers FMCSA-DQ-391.15-Q006 n/a
What post-accident alcohol and drug testing requirements are there for U.S. employer’s drivers involved in an accident occurring outside the U.S.? FMCSA-D&A-382.303-Q04 Guidance on whether post-accident testing is required for U.S. employer’s drivers involved in an accident occurring outside the U.S.