Defined since the 1980s as "an electric, electronic, electromechanical, or mechanical device capable of recording driver's duty status information accurately and automatically as required by §395.15. The device must be integrally synchronized with specific operations of the commercial motor vehicle in which it is installed. At a minimum, the device must record engine use, road speed, miles driven, the date, and time of day."

Many of the devices installed prior to December 18, 2017, were AOBRDs. With very few exceptions, AOBRD can no longer be placed into initial service. However, any AOBRD installed and in use before December 18, 2017, can be used as an AOBRD until December 16, 2019. At that time, any remaining AOBRDs will need to be updated to meet the ELD technical specifications.

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