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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
Is a driver service or leasing company that is not a motor carrier permitted to perform annual reviews of driving records (§391.25) on the drivers it furnishes to motor carriers? FMCSA-DQ-391.25-Q002 Driving record annual inquiry
Are mobile cranes operating in interstate commerce considered CMVs, and are they subject to the FMCSRs? FMCSA-RG-390.5T-Q009 Are mobile cranes CMVs subject to the FMCSRs?
If an interstate driver tests positive for alcohol or controlled substances under part 382, must the driver be medically re-examined and obtain a new medical examiner’s certificate to drive again? FMCSA-MED-391.41-Q5 Driver Physical Qualification Standards
§391.15 Disqualification of drivers. FMCSA-DQ-391.15-Q004 Driver disqualification
What does the foot accommodation rule mean when it states: "The step need not retain the disc at rest"? FMCSA-RG-399.207-FAQ02 Access requirements for truck and truck-tractor cabs
Question 1: What is the fine or penalty for employers who refuse or fail to provide Part 382 testing information to a subsequent employer? FMCSA-D&A-382.507-Q01 Drug & Alcohol Testing – Failure to Comply with Request for Testing Information
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? FMCSA-HOS-395.1-Q21 Hours of Service
Must a motor carrier respond to a third-party administrator’s request (as directed by the specific, written consent of the driver authorizing release of the information on behalf of an entity such as a motor carrier) to release driver information that is FMCSA-D&A-382.405-Q02 Drug & Alcohol Testing Records - Access
Is a warning device required in a Commercial Motor Vehicle (CMV) with a single hydraulic brake system which uses the driveline parking brake as the emergency brake system? FMCSA-VEH-393.51-Q04 Is a warning device required on a hydraulic brake system with driveline parking brake as emergency brake?
Do the FMCSRs specify what type of horn is to be used on a CMV? FMCSA-VEH-393.81-Q01 Type of horn on CMV