Trucking Terms Guide

ELD and HOS / Logs

What does AOBRD mean in trucking?

Short answer: Automatic onboard recording device, an older electronic log device category largely replaced by ELD rules.

Plain-English explanation

AOBRD (Automatic On-Board Recording Device) was the predecessor electronic logging technology to the modern ELD (Electronic Logging Device). AOBRDs recorded driver hours of service electronically but operated under less stringent technical specifications than today's ELDs -- they did not require tamper-proof engine synchronization, real-time GPS tracking, or the specific data elements mandated by the FMCSA's current ELD rule. The FMCSA's ELD mandate was issued in December 2015 and phased in over several years: - December 18, 2017: ELDs required for most carriers; existing AOBRD users could grandfather their devices temporarily - December 16, 2019: Final phase-out date for AOBRDs; all qualifying carriers must use compliant ELDs After December 2019, AOBRD is not a compliant HOS recording method. Any carrier still operating with an AOBRD device after that date is operating without compliant logging equipment -- a violation subject to enforcement action. Today, AOBRD is primarily a historical term that comes up in two contexts: - Carriers who transitioned to ELDs close to the deadline may still have documentation mentioning AOBRDs - Older drivers who trained on AOBRDs may use the term to refer to any electronic logging device

With logs and hours, timing matters. A phrase may sound simple, but the ELD record, duty status, supporting documents, and roadside inspection context can change how it should be handled.

Why it matters in trucking

AOBRD is no longer a compliant HOS recording method. Any carrier or driver who encounters this term in a current compliance context should understand that the device in use must meet ELD specifications, not AOBRD specifications -- the two are not equivalent, and an AOBRD fails compliance review if presented as an ELD.

A clean ELD log is easier to defend when the driver and office understand the vocabulary before an edit, annotation, or inspection request comes in.

Example in real use

A compliance reviewer at a broker runs a carrier check and finds a reference to "AOBRD" in the carrier's equipment documentation from 2018. The broker asks the carrier to confirm their current ELD setup. The carrier confirms they upgraded to a certified ELD in 2019. The AOBRD reference was historical documentation -- their current logging equipment meets ELD specifications and is compliant.

Common mistakes or confusion

  • Using "AOBRD" interchangeably with "ELD" in current documentation -- they are different standards; using the wrong term in compliance documentation creates confusion.
  • Assuming that because a device records hours electronically it is an ELD -- the ELD rule has specific technical certification requirements; a generic electronic recorder that is not FMCSA-certified as an ELD is not compliant.
  • Not knowing the ELD's registration number in the FMCSA-registered ELD list -- compliant ELDs must appear on the FMCSA's registered device list; devices not on the list are not compliant regardless of their technical capabilities.

Related terms

ELD Electronic logging device, equipment used to record driver hours-of-service data. Audit Trail A record of changes or events in a logging system that helps explain how driver log data changed. Supporting Documents Business documents used to support or verify a driver's records of duty status. Duty Status A driver log category such as driving, on duty, off duty, or sleeper berth. Personal Conveyance Off-duty movement of a commercial motor vehicle for personal use when conditions are met. Yard Move A special driving status used for movement in a yard rather than over-the-road driving.

Commonly confused with

ELD Electronic logging device, equipment used to record driver hours-of-service data.

Related guides

ELD and HOS Terms is the best next place to keep learning this topic.

Sources and last updated

HOS and ELD definitions reflect the current FMCSA Hours-of-Service Summary and ELD regulatory guidance, including the September 2020 final rule. See the sources page for full reference list.

Last updated: 2026-05-08