USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

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
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
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
ELD FAQ 61: Electronic Logging Devices and Hours of Service – Technical Specifications FMCSA-HOS-ELD-TECH-395-FAQ61 ELD Guidance
What is an authentication value? FMCSA-HOS-ELD-TECH-395-FAQ93(2017-09-01)-CORR1 ELD Guidance
How should the Time Zone Offset from UTC handle daylight savings time? FMCSA-HOS-ELD-TECH-395-FAQ26-RESCINDED ELD Guidance
When is the electronic logging device (ELD) required to display data? FMCSA-HOS-ELD-TECH-395-FAQ63(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
Would it be acceptable for the data transfer to be initiated by the electronic logging device (ELD) but relayed through and communicated to the Federal Motor Carrier Safety Administration (FMCSA) Service from the provider’s backend? FMCSA-HOS-ELD-TECH-395-FAQ66(2017-09-01)-CORR1 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
Is it necessary for drivers to enter their user credentials before starting the data transfer process? FMCSA-HOS-ELD-TECH-395-FAQ69(2017-09-01)-CORR1 ELD Guidance