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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
Can an electronic logging device (ELD) connect to the electronic control module (ECM) in a manner that relies on internet, Bluetooth® or another method of connectivity? FMCSA-HOS-ELD-TECH-395-FAQ82(2017-09-01)-CORR1 ELD Guidance
Can the partial VIN value obtained from the controller area network bus be used for reporting? FMCSA-HOS-ELD-TECH-395-FAQ22 Electronic Logging Devices and Hours of Service – Technical Specifications
ELD FAQ 85: Electronic Logging Devices and Hours of Service – Technical Specifications FMCSA-HOS-ELD-TECH-395-FAQ85 ELD Guidance
ELD FAQ 56: Electronic Logging Devices and Hours of Service – Technical Specifications FMCSA-HOS-ELD-TECH-395-FAQ56-RESCINDED ELD Guidance
Will electronic logging device (ELD) providers be able to provide an updated public key in the event of a security breach? FMCSA-HOS-ELD-TECH-395-FAQ88(2017-09-01)-CORR1 ELD Guidance
Section 4.8.1.3 of 49 CFR part 395, subpart B, Appendix A indicates that location needs to be displayed for login/logout events. However, section 4.5.1.5 lists required data elements for login/logout events and does not indicate that latitude and... FMCSA-HOS-ELD-TECH-395-FAQ59(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 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
ELD FAQ 94: : Electronic Logging Devices and Hours of Service – Technical Specifications FMCSA-HOS-ELD-TECH-395-FAQ94 ELD Guidance
In a portable device platform, should the event identifier sequence number be associated with the portable device or the vehicle’s black box? FMCSA-HOS-ELD-TECH-395-FAQ28 Electronic Logging Devices and Hours of Service – Technical Specifications