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.

The latest information on the Coronavirus Disease 2019 (COVID-19) is available on

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 in accordance with 49 CFR 5.41, send your request to: Please identify the guidance document in your request.

Subject Agency Identifier Topic Issued Date
May an employer conduct a road test administered in accordance with 49 CFR §391.31 prior to driver-applicant subject to 49 CFR §382 submits to a pre-employment controlled substances test? FMCSA-D&A-382.301-FAQ004 Whether an employer may administer a road test to a prospective driver subject to Part 382 without first conducting a pre-employment test
If a driver is required repeatedly to respond to satellite or similar communications received during a 10-hour off-duty period (8-hour off-duty period for passenger transportation), does this activity affect a driver’s duty status? FMCSA-HOS-395.2-Q31 Hours of Service Definitions
Is a vehicle used to transport or tow an anhydrous ammonia nurse tank considered a CMV and subject to FMCSRs? FMCSA-RG-390.5T-Q002 Applicability of FMCSRs to vehicles towing nurse tanks
Question 1: Is §392.10(a)(4) applicable to drivers operating cargo tank vehicles that were used to transport hazardous materials for which placarding or marking was required, but are no longer required because the cargo tank has been emptied, or the quant FMCSA-DRV-392.10-Q001 Railroad crossings
If an employer is subject to random testing for only a partial calendar year, how should the employer determine the number of random tests required during the year to achieve the appropriate testing rate? (Examples: new employers that begin operating midw FMCSA-D&A-382.305-FAQ014 Guidance on how to determine the number of random tests required during the year to achieve the appropriate testing rate for employers who are subject to random testing for only a partial calendar year
If a driver drives in a non-commercial vehicle to take a physical examination, should the duty status be recorded as on-duty not driving, or as off-duty? Would the answer change if the motor carrier directs the driver to go for the examination? FMCSA-HOS-395.2-Q32 Hours of Service Definitions
Part 387 Section § 387.27: Applicability. FMCSA-INS-387.27-Q002 How passenger carrier financial responsibility requirements are determined
Would a driver delivering an empty commercial motor vehicle designed or used to carry passengers, from the manufacturer or distributor to a dealer be required to comply with the hours-of-service regulations for passenger-carrying drivers? FMCSA-HOS-395.5-Q01 Hours of Service Maximum Driving Time
If a motor carriers sends a potential interstate driver to a medical examiner to have both a pre-employment medical examination and a pre-employment controlled substances test performed, how must the medical examiner conduct the medical examination includ FMCSA-MED-391.43-Q7 Drug Testing and Driver Physical Qualification Examination
FAQ 1: Does the definition of “livestock” in § 395.2 include llamas, alpacas, live fish, and crawfish, as added by the 2018 amendment to the Emergency Livestock Feed Assistance Act of 1988? FMCSA-HOS-AG-395.2-FAQ001 Hours of Service Exceptions