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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
ELD FAQ 23:Electronic Logging Devices and Hours of Service—Cross Border Transportation FMCSA-HOS-ELD-395-FAQ23-RESCINDED ELD Guidance
Advisory: Guidance on the Application of 49 CFR Section 385.403; Who Must Hold a Safety Permit? FMCSA-HM-HMSP-ADVISORY.2017.10.26 Hazardous Materials Safety Permits
As specified in section 4.8.2.1.1 of 49 CFR part 395, subpart B, Appendix A, the electronic logging device (ELD) output file must have one line for co-driver information and one line for commercial motor vehicle (CMV) information. How can the ELD... FMCSA-HOS-ELD-TECH-395-FAQ70(2017-09-01)-CORR1 ELD Guidance
Will the Federal Motor Carrier Safety Administration (FMCSA) notify the industry when an electronic logging device (ELD) is under an investigation? FMCSA-HOS-ELD-TECH-395-FAQ96(2017-09-01)-CORR1 ELD Guidance
ELD FAQ 95: Electronic Logging Devices and Hours of Service – Technical Specifications FMCSA-HOS-ELD-TECH-395-FAQ95 ELD Guidance
ELD FAQ 94: : Electronic Logging Devices and Hours of Service – Technical Specifications FMCSA-HOS-ELD-TECH-395-FAQ94 ELD Guidance
What is an authentication value? FMCSA-HOS-ELD-TECH-395-FAQ93(2017-09-01)-CORR1 ELD Guidance
In what format should I submit my public key to the Federal Motor Carrier Safety Administration (FMCSA)? FMCSA-HOS-ELD-TECH-395-FAQ92(2017-09-01)-CORR1 ELD Guidance
ELD FAQ 91: Electronic Logging Devices and Hours of Service – Technical Specifications FMCSA-HOS-ELD-TECH-395-FAQ91 ELD Guidance
When an existing record becomes inactive and its replacement record becomes active or inactive‐ change‐requested, is it acceptable that the replacement record has the same sequence ID as the record it replaces? FMCSA-HOS-ELD-TECH-395-FAQ29 Electronic Logging Devices and Hours of Service – Technical Specifications