Electronic Logging Device

An ELD connects to the engine control module and automatically captures driving time, engine hours, vehicle movement, and location at defined intervals. Drivers annotate duty status changes, but driving time is recorded automatically and cannot be edited without a visible audit trail.

The ELD mandate has applied to most interstate commercial drivers since December 2019, with limited exemptions for older vehicles and short-haul operations.

Alternative Names:

ELD, E-Log Device

Why it Matters?

ELD data is often the most reliable evidence in a trucking case because it is machine-generated and timestamped. It reveals not only hours of service compliance but also speed, location, and stop patterns, and the edit audit trail can expose attempts to alter records after a crash. Retention periods are short, which makes immediate preservation demands essential.

Frequently Confused with

Related terms

Frequently asked questions

How long is ELD data retained?

Carriers are generally required to retain ELD records and supporting documents for six months. Underlying telematics data may be purged sooner, which is why preservation demands should go out immediately.

Can ELD records be edited?

Duty status annotations can be edited, but the device must retain the original entry and log the change. Automatically captured driving time cannot be erased, so edits are visible.