Application and Exceptions: Overview
Unless a specific exception applies, the HOS rules found in Part 395 apply to all motor carriers and drivers. There are over twenty possible exceptions. Most, but not all, of those exceptions will preempt any contrary or conflicting state law or regulation governing the safe operation of CMVs.Regulation specifying that the exceptions applicable to CMVs involved in ground water well drilling operations and the transportation of construction materials and equipment will not preempt state law.
Application of HOS Rules & Exceptions