Glossary of Terms

The transportation industry has a lot of acronyms, and the world of electronic logging adds even more to the mix. Here’s an ongoing list of common acronyms and their definitions.


ELD (Electronic Logging Device) – A device for electronically tracking driver logs. This is the new term used in the 2015 DOT rule mandating the use of electronic logs that comply with certain standards.

EOBR (Electronic On Board Recorder) – An outdated term for the next generation of logging devices. This term has been replaced by ELD.

AOBRD (Automated On Board Recording Device) – The older, less regulated style of electronic log devices that comply with older DOT rules published before the 2015 mandate.

DOT (Department of Transportation) – The United States governmental department that regulates transportation (including trucking and commercial passenger transport).

FMCSA (Federal Motor Carrier Safety Administration) – An agency within the DOT that regulates the commercial transportation industry and tries to improve overall safety.

CMV (Commercial Motor Vehicle) – A vehicle of certain weight and cargo requirements that is used commercially to transport passengers or property.

HOS (Hours of Service) – A professional driver’s time, as regulated by the DOT. Hours of Service are tracked using a log of time spent in various statuses: On Duty, Driving, Off Duty, and Sleeper Berth. Limits are placed on how much a driver can work, and how much time he must take time off to rest.

RODS (Record of Duty Status) – A log of a driver’s Hours of Service. This may be on paper logs, or electronic using an ELD.

DVIR (Driver Vehicle Inspection Report) – At the completion of each day’s work, a driver is required to prepare a report listing any maintenance defects found in the vehicle or trailer. Many ELDs include a DVIR form in their daily HOS process for the driver.

BYOD (Bring Your Own Device) – BYOD refers to a style of ELD where the trucking company or driver can supply their own cell phone or tablet to be used as the ELD’s display. ELD regulation still requires a direct wired connection to the truck’s engine, so typically the cell/tablet connects wirelessly to another piece of hardware (provided by the ELD vendor) that hooks up the ECM.

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