Abbreviation: ELD

Electronic Logging Device

A device that automatically records a CDL driver's hours of service data by connecting to the vehicle's engine control module.

ELDs replaced paper log books and AOBRDs under the FMCSA ELD mandate. All compliant devices must be self-certified and listed on the FMCSA ELD website. Owner-operators with their own authority must supply their own ELD if subject to HOS rules. Devices must record 13 required data fields including duty status, location, and miles driven.

Related: hos , rods , log book , short haul exemption , personal conveyance

Last updated: May 28, 2026