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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
How does the HMSP Program Improvement policy affect current HMSP holders who are submitting renewal applications? FMCSA-HM-HMSP-385-FAQ027 Hazardous Materials Safety Permits
May HMSP carriers request a review of their crash data? FMCSA-HM-385-FAQ026 Hazardous Materials Safety Permits
How will FMCSA use SMS data as part of the HMSP review process? FMCSA-HM-HMSP-385-FAQ017 Hazardous Materials Safety Permits
Hazardous Materials Safety Permit (HMSP) Program: Amendment to Enforcement Policy, 80 Fed. Reg. 35253 FMCSA-FR-80FR35253.2015.06.19 Hazardous Materials Safety Permits
Commercial Driver’s License Standards; Regulatory Guidance Concerning the Passenger Endorsement Standards, 80 Fed. Reg. 30163 (May 27, 2015) FMCSA-FR-80FR30163-2015.05.27 Regulatory Guidance
Are crashes involving motorists striking attenuator trucks while the impact attenuators or crash cushions are deployed included within the definition of ‘‘accident’’ with regard to the motor carrier responsible for the operation of the attenuator truck? FMCSA-RG-390.5T-FAQ033 Accidents involving attenuator trucks
Are crashes involving motorists striking attenuator trucks while the impact attenuators or crash cushions are deployed included within the definition of ‘‘accident’’ with regard to the motor carrier responsible for the operation of the attenuator truck? FMCSA-RG-390.5T-FAQ033 Accidents involving attenuator trucks
The collector stopped the test and reported to the designated employer representative (DER) that it was not completed. What happens in this situation? FMCSA-D&A-40.193-FAQ001 Guidance on what happens when an employee does not provide sufficient urine for a drug test.
Alternate Drivers and Random Testing: Can an alternate driver be selected for a DOT random test if the driver originally selected is not able to be tested during the selection period? FMCSA-D&A-382.305-FAQ001 Provides guidance in the use of alternates to comply with the random testing selections.
Requirements for Positives or Refusals: A CDL driver tests positive, or refuses to take, a DOT drug or alcohol test. What must the driver do to be able to resume performing safety sensitive functions, such as operating any type of commercial motor vehicle FMCSA-D&A-382.503-FAQ001 Guidance about the return-to-duty requirement.