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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
Will foreign drug testing laboratories need to be certified by the National Institute on Drug Abuse (NIDA)? Will they need to be certified by the Department of Health and Human Services (DHHS)? FMCSA-D&A-382.105-Q03 Applicability of Section § 382.105
In § 399.207(b)(4), Illustration III, what does the unshaded area within the disc suggest? FMCSA-RG-399.207-FAQ03 Access requirements for truck and truck-tractor cabs
Why does the Federal Motor Carrier Safety Administration (FMCSA) allow post-accident tests done by Federal, State or local law enforcement agencies to substitute for a §382.303 test even though the FMCSA does not allow a Federal, State or local law enforc FMCSA-D&A-382.303-Q01 Post accident testing conducted by Federal, State or local law enforcement agencies
May a truck driver use the adverse driving conditions exception if he/she has accumulated driving time and on-duty (not driving) time, that would put the driver over 14 hours or over 70 hours in 8 consecutive days? FMCSA-HOS-395.1-Q03 Hours of Service Exceptions
What are the lighting requirements when a container assumes the structural requirements of a trailer? FMCSA-VEH-393.25-Q03 Lighting requirements for containers as structural trailers
Guidance on how a Canadian motor carrier can comply with the testing regulations when adding cross border work to an intra-Canadian driver’s duties FMCSA-D&A-382.305-Q16 Guidance on how a Canadian motor carrier can comply with the testing regulations when adding cross border work to an intra-Canadian driver’s duties
Must non transportation-related work for a motor carrier be recorded as on-duty time? FMCSA-HOS-395.2-Q11 Hours of Service Definitions
May a motor carrier switch from a 60-hour/7-day limit to a 70-hour/8-day limit or vice versa? FMCSA-HOS-395.3-Q01 Hours of Service Maximum Driving Time
May the information in the stopping distance table be used to determine the stopping distances at speeds greater than 20 mph? FMCSA-VEH-393.52-Q01 Can the stopping-distance table be used for speeds above 20 mph?
Driver vehicle inspection report FMCSA-VM-396.11-Q010 Driver vehicle inspection report