The Compliance Sourcebook
A living repository of definitions, acronyms, and direct links to federal databases.
A-E Key Terminology
Adverse Driving Conditions
An exception to the Hours of Service rules allowing a driver to extend their driving window by up to 2 hours if they encounter unforeseen weather or traffic conditions that were not apparent at the time of dispatch.
Coercion
Threatening a driver to violate a regulation (like HOS or vehicle maintenance) by withholding work or threatening employment termination. This is a severe violation for carriers and shippers alike.
ELD (Electronic Logging Device)
Hardware that synchronizes with a vehicle engine to automatically record driving time for easier, more accurate HOS recording. Mandatory for most interstate carriers since December 2017.
F-Z Key Terminology
Form and Manner
Specific data elements required on a log (electronic or paper) such as shipping document numbers, trailer numbers, dates, and signatures. Often a source of “low hanging fruit” violations during audits.
Personal Conveyance (PC)
The movement of a commercial motor vehicle (CMV) for personal use while off-duty. A driver may record time operating a CMV for personal conveyance as off-duty only when the driver is relieved from work and all responsibility for performing work.
The Federal Register
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