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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
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
ELD FAQ87: Electronic Logging Devices and Hours of Service – Technical Specifications FMCSA-HOS-ELD-TECH-395-FAQ87-RESCINDED ELD Guidance
Does the ELD rule require that the driver have editing capabilities? FMCSA-HOS-ELD-TECH-395-FAQ34 Electronic Logging Devices and Hours of Service – Technical Specifications
If you are creating an application (app) to be used on a smartphone or tablet, do you have to verify and list all the devices that the app works on? FMCSA-HOS-ELD-TECH-395-FAQ90(2017-09-01)-CORR1 ELD Guidance
What is an authentication value? FMCSA-HOS-ELD-TECH-395-FAQ93(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
Is the ELD required to retrieve the CMV position from the device connected to the port, or can this be retrieved by using a smartphone or tablet? FMCSA-HOS-ELD-TECH-395-FAQ21
ELD FAQ 61: Electronic Logging Devices and Hours of Service – Technical Specifications FMCSA-HOS-ELD-TECH-395-FAQ61 ELD Guidance
How should the ELD handle the dashboard odometer display not matching the odometer value returned by the ECM? For instance, when the engine is replaced and the value is not synced. FMCSA-HOS-ELD-TECH-395-FAQ24 Electronic Logging Devices and Hours of Service – Technical Specifications
When a driver makes an edit, should the original record be visible in the print or display option? FMCSA-HOS-ELD-TECH-395-FAQ62(2017-09-01)-CORR1 ELD Guidance