Glossary
AOBRD (Automatic On-Board Recording Device)
The technology ELDs replaced. AOBRDs automatically recorded duty status but weren't held to the same technical standard as ELDs, and haven't been legal to use since December 16, 2019.
What AOBRD means in practice
An AOBRD (automatic on-board recording device) is the technology ELDs replaced: it recorded duty status automatically but was not held to the ELD's technical standard, and it has not been legal to use since December 16, 2019. For most fleets today it is history, but it still matters in two situations: buying a used truck or a whole fleet from an operator that has not updated its hardware in years, and talking with a driver or mechanic who still says 'the AOBRD' out of habit when they mean the ELD.
The practical rule is simple. If you inherit a vehicle with AOBRD hardware still installed and in use, treat it as an immediate compliance gap, not a quirk to sort out later. There is no exemption or workaround that makes it acceptable. Check the logging device as part of due diligence, the same way you would check registration and maintenance records, and confirm it appears on FMCSA's registered ELD list.
Switching also means starting fresh. AOBRD and ELD systems were built to different technical standards, so historical AOBRD records are not migrated into a new ELD; the new device simply begins logging.
Read the full explainer
The definition above is the short version. The page below explains AOBRD (Automatic On-Board Recording Device) in depth, with the rules, numbers and examples behind it.
ELD vs. AOBRD: What ChangedGuides that explain AOBRD (Automatic On-Board Recording Device)
AOBRD: common questions
Can a fleet still legally use an AOBRD?
No. The FMCSA grandfather clause that let carriers keep using AOBRDs installed before the ELD rule's December 18, 2017 compliance date ended on December 16, 2019, and no extensions were granted. Any commercial vehicle still logging hours of service on an AOBRD instead of a registered ELD has been out of compliance since then.
What is the difference between an AOBRD and an ELD?
Both connect to the engine and record driving time automatically, but an ELD must meet a published technical standard and appear on FMCSA's registered list. ELDs also require standardized roadside data transfer, keep the original record when an edit is made, and must detect and flag malfunctions. AOBRDs were largely self-certified by manufacturers, with looser requirements.
How can I tell if a used truck still has an AOBRD?
Check the logging device against FMCSA's registered ELD list, or ask the previous operator which system was in use. Any device that is not on the registered list should be treated as non-compliant and replaced before the truck goes back into service, even if it looks like an ELD from the driver's seat.