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6.4 Hours of Service (Part 395)

This section explains the hours of service (HOS) rules, and outlines Subpart A—General and Subpart B—Electronic Logging Devices (ELDs). “Hours of service” refers to the maximum amount of time drivers are permitted to be on duty including driving time, and specifies number and length of rest periods, to help ensure that drivers stay awake and alert. In general, all carriers and drivers operating commercial motor vehicles (CMVs) must comply with HOS regulations in 49 CFR 395. Exceptions are listed in Sections 395.1 (b through x)

Note: On June 1, 2020, FMCSA published a revised hours of service (HOS) final rule that introduces changes to four HOS provisions to provide drivers with greater flexibility while maintaining high safety standards on our Nation’s roads. Drivers and motor carriers are required to comply with the new provisions starting on September 29, 2020. Visit the HOS website to learn about the changes.

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