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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 is the applicability of the FMCSRs to motor carriers owning and operating school buses that contract with a municipality to provide pupil transportation services? FMCSA-RG-390.3T-Q014 Applicability of FMCSRs to school bus contractors
Do the definitions of "farm", "farmer" and "agricultural crops" apply to greenhouse operations? FMCSA-RG-390.5T-Q001 Applicability of farm-related definitions to greenhouse operations
When a driver fails to meet the provisions of the 100 air-mile radius exemption (section 395.1(e)), is the driver required to have copies of his/her records of duty status for the previous seven days? Must the driver prepare daily records of duty status f FMCSA-HOS-395.8-Q20 RODS and the 100 air-mile radius exemption
If a driver logs his/her duty status as “driving” but makes multiple short stops (each less than 15 minutes) for on-duty or off-duty activities, marks a vertical line on the grid for each stop, and records the elapsed time for each in the remarks section FMCSA-HOS-395.8-Q22 how to count non-driving activities against the driving limit
Recordkeeping requirements for electronic HOS files FMCSA-ELD-HOS-395.15-Q01 Recordkeeping requirements for electronic HOS files
May an automatic on-board recording device use an algorithm to identify the location of each change in duty status relative to the nearest city, town, or village? FMCSA-ELD-HOS-395.15-Q03 AOBRD use of algorithm
Are automatic on-board recorders (AOBRDs) required to be designed and maintained to prevent team drivers in a non-driving duty status from making updates to their electronic record of duty status while the vehicle is in motion? FMCSA-ELD-HOS-395.15-Q04 When a non-driver may update their eROD
What hours-of-service regulations apply to drivers operating between the United States and Mexico or between the United States and Canada? FMCSA-HOS-395.1-Q01 Hours of Service
If a driver invokes the exception for adverse driving conditions, does a supervisor need to sign the driver’s record of duty status when he/she arrives at the destination? FMCSA-HOS-395-Q02 Hours of Service Exception
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