An Electronic Logging Device (ELD) is a technology used by commercial drivers to automatically record their driving hours. It connects to a vehicle's engine to track when the vehicle is in motion, helping ensure compliance with regulations regarding driving time and rest periods. This device replaces traditional paper logbooks, making it easier for drivers to maintain accurate records. ELDs are required for most commercial motor vehicles in the United States, as mandated by the Federal Motor Carrier Safety Administration (FMCSA). They help improve road safety by reducing driver fatigue and ensuring that drivers adhere to legal limits on driving hours.