Highly regulated operational sectors often have bountiful, and sometimes conflicting, defined terms that make all the difference in legal matters. The domestic and international transportation and logistics sector is no different. The term “commercial motor vehicle” is a classic example of this day-to-day impact in commercial environments as well as the risk of error by using conflicting terms. Commercial motor vehicle is defined at least seven times across Title 49. The definitions are triggered by different activities and equipment types—and their correct application makes all the difference between compliance and noncompliance.