USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

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 liability of a motor carrier for hours of service violations? FMCSA-HOS-395.3-Q07 Hours of Service Maximum Driving Time
Is a driver who works for a motor carrier on an occasional basis and who is regularly employed by a non-motor carrier entity required to submit either records of duty status or a signed statement regarding the hours of service for all on-duty time? FMCSA-HOS-395.8-Q11 Hours of Service Records of Duty Status
May the Form MCS-90 required by part 387 for proof of minimum financial responsibility be modified? FMCSA-INS-387.15-Q002 Modification of Form MCS-90
How does one distinguish between intra- and interstate commerce for the purposes of applicability of the FMCSRs? FMCSA-RG-390.3T-Q006 Interstate v. intrastate commerce
What alcohol and drug testing provisions apply to foreign drivers employed by foreign motor carriers? FMCSA-D&A-382.103-Q09 Applicability of Section 382.105
Question 2: May an employer accept proof of supervisory training for a supervisor from another employer? FMCSA-D&A-382.603-Q02 Drug & Alcohol Testing – Proof of Supervisory Training
Is a motor vehicle drawing a non-self-propelled mobile home that has one or more set of wheels on the roadway, a driveaway-towaway operation? FMCSA-RG-390.5T-Q022 Mobile homes in driveaway-towaway operations
Question 18: In rare circumstances, it is necessary to refer an individual immediately for inpatient substance abuse services. May the SAP provide direct treatment services or refer the individual to services provided by a treatment facility with which he FMCSA-D&A-382.605-Q18 Drug & Alcohol Testing – Conflict of Interest in SAP Referrals
If a driver is transported by automobile from the point of a breakdown to a terminal, and then dispatched on another run, how is the time spent in the automobile entered on the record of duty status? FMCSA-HOS-395.2-Q24 Hours of Service Definitions
Is there a minimum number of fasteners required to fasten the upper fifth wheel plate to the frame of a trailer? FMCSA-VEH-393.70-Q01 Securing upper fifth wheel plate to trailer frame