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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
May employers allow unions or the National Labor Relations Board to view or have access to test records required to be prepared and maintained by parts 40 and/or 382, such as the list(s) of all employees actually tested? FMCSA-D&A-382.405-Q03 Drug & Alcohol Testing Records - Access
How does compensation relate to on-duty time? FMCSA-HOS-395.2-Q10 Hours of Service Definitions
Does § 393.41 prohibit air brake systems from being equipped with a means to release the spring brakes for purposes of towing disabled vehicles in emergency situations? FMCSA-VEH-393.41-Q02 Releasing spring brakes for towing
What difference, if any, is there between a warning device and a warning signal? FMCSA-VEH-393.51-Q05 What’s the difference between a warning device and a warning signal?
When one of these individuals has a second job with an interstate motor carrier and works a 24-hour shift for the fire/rescue/emergency services department, is all of the time spent during the shift considered on-duty time? FMCSA-HOS-395.2-Q29 Hours of Service Definitions
Question 1: Who makes the determination, the driver or carrier, that conditions are sufficiently dangerous to warrant discontinuing the operation of a CMV? FMCSA-DRV-392.14-Q001 Hazardous conditions
Model Training Curriculum for Motorcoach Drivers FMCSA-PASS-MODEL TRAINING CURRICULUM FOR MOTORCOACH DRIVERS Motorcoach Driver Trainng
Must a motor carrier retain 100-air-mile driver time records at its principal place of business? FMCSA-HOS-395.1-Q14 Hours of Service Exceptions
Risk Retention Groups established under the Liabity Risk Retention Act of 1986 FMCSA-FR-52FR11277.1987.04.08 Liability Insurance