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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
Withdrawal of Regulatory Guidance Concerning the Federal Motor Carrier Safety Regulations, 75 FR 31836 FMCSA-FR-75FR31836.2010.06.04 Safety
Withdrawal of Proposed Improvements to the Motor Carrier Safety Status Measurement System (SafeStat) and Implementation of a New Carrier Safety Measurement System (CSMS), 75 Fed. Reg. 1825 FMCSA-FR-75FR18256.2010.04.09 sms
Regulatory Guidance Concerning the Applicability of the Federal Motor Carrier Safety Regulations to Texting by Commercial Motor Vehicle Drivers, 75 Fed. Reg. 4305 FMCSA-FR-75FR4305.2010.01.27 texting
Regulatory Guidance Concerning the Applicability of the Federal Motor Carrier Safety Regulations to Texting by Commercial Motor Vehicle Drivers, 75 Fed. Reg. 4305 FMCSA-FR-75FR4305.2010.01.27 texting
Regulatory Guidance Concerning Applicability of the Federal Motor Carrier Safety Regulations to Mobile Cranes Operated in Interstate Commerce FMCSA-FR-74FR43640.2009.08.27 Applicability of FMCSRs to mobile cranes operating in interstate commerce
What location may a motor carrier designate as its "principal place of business?" FMCSA-RG-390.5T-Q031 Designation of “principal place of business”
What location may a motor carrier designate as its "principal place of business?" FMCSA-RG-390.5T-Q031 Designation of “principal place of business”
May a motor carrier with a single business location, including a private residence, designate a different location as its "principal place of business?" FMCSA-RG-390.5T-Q032 “Principal place of business” with single location
May a motor carrier with a single business location, including a private residence, designate a different location as its "principal place of business"? FMCSA-RG-390.5T-Q032 “Principal place of business” with single location
Regulatory Guidance on the Definition of “Principal Place of Business,” 74 Fed. Reg. 37653 FMCSA-FR-74FR37653.2009.07.29 Principal Place of Business