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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
When is the electronic logging device (ELD) required to automatically change the driver’s duty status to Driving? FMCSA-ELD-395-Q069(2022-03-10) ELD Guidance
If the driver rejects unidentified driving, should that be displayed on the electronic logging device (ELD) for the roadside inspection view and output file view? FMCSA-ELD-395-Q052(2022-03-10) ELD Guidance
What is the commercial motor vehicle (CMV) power unit number? FMCSA-ELD-395-Q071(2022-03-10) ELD Guidance
Can an electronic logging device (ELD) provider pass the one-minute boot time rule by requiring the driver to power on the device (or an app) prior to starting the engine? FMCSA-ELD-395-Q055(2022-03-10) ELD Guidance
Can a mobile app and the vehicle engine communicate over a cellular network? FMCSA-ELD-395-Q034(2022-03-10) ELD Guidance
If the required electronic logging device (ELD) data from the electronic control module (ECM) is private and requires an agreement with the original equipment manufacturer (OEM) to obtain said data, are ELD providers required to enter an agreement with... FMCSA-ELD-395-Q058(2022-03-10) ELD Guidance
In the ELD header, should miles driven reflect miles in the current commercial motor vehicle (CMV) or all CMVs that the driver has operated on the displayed date? What about Start End Odometer and Engine Hours? FMCSA-ELD-395-Q074(2022-03-10) ELD Guidance
When should a driver use paper logs or electronic logging software if an electronic logging device (ELD) malfunction occurs? FMCSA-ELD-395-Q039(2022-03-10) ELD Guidance
If a driver is permitted to use a commercial motor vehicle (CMV) for personal reasons, how must the driving time be recorded? FMCSA-HOS-ELD-395-FAQ62(2022-03-10) ELD Guidance
Can an electronic logging device (ELD) allow for a user to switch between ELD mode and automatic onboard recording device (AOBRD) mode? FMCSA-ELD-395-Q022(2022-03-10) ELD Guidance