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
Crash Preventability Determination Program, 84 FR 38087 FMCSA-FR-84FR38087.2019.08.05 crash preventability
Advisory: Declaring the Transportation of Anhydrous Ammonia and Class 3, Flammable Liquids When Filing FMCSA Registration. FMCSA-HM-ADVISORY.2019.06.05 Hazardous Materials
ELD Carrier-Driver Training FMCSA-HOS-ELD-TRAINING-395-FAQ3 ELD Guidance
ELD Provider Training FMCSA-HOS-ELD-TRAINING-395-FAQ4 ELD Guidance
If a medical review officer (MRO) changes a verified positive drug test result per 49 CFR Part 40, when must the MRO submit the change to the Clearinghouse? FMCSA-D&A-CLEAR-382.705-FAQ007 Guidance on when an MRO must report a changed result to the Clearinghouse
What violation and return-to-duty (RTD) information must employers report to the Clearinghouse? FMCSA-D&A-CLEAR-382-FAQ016 Guidance on Employer Violation and RTD Reporting
Can Canadian and Mexican substance abuse professionals (SAPs) report the date of initial SAP assessment and date the driver is eligible for return-to-duty (RTD) testing? FMCSA-D&A-CLEAR-40.281-FAQ001 Guidance on Canadian and Mexican SAP Reporting to the Clearinghouse
Can Canadian and Mexican medical review officers (MROs) report verified positive test results and refusals to test to the Clearinghouse? FMCSA-D&A-CLEAR-40.121-FAQ001 Guidance on Canadian and Mexican MRO Reporting to the Clearinghouse
Is the Federal Motor Carrier Safety Administration (FMCSA) subject to the obligations under the Fair Credit Reporting Act (FCRA) for the Clearinghouse? FMCSA-D&A-CLEAR-382-FAQ018 Guidance on the applicability of the Fair Credit Reporting Act [FCRA] to the Clearinghouse
Will a driver’s follow-up testing plan be available in the Clearinghouse? FMCSA-D&A-CLEAR-382-FAQ020 Guidance clarifying that follow testing plans are not available in the Clearinghouse