The ELD requirement replaced most paper logbooks with devices that record duty status automatically. If you are running interstate freight, it shapes both what you must do and — more usefully — what data you now have.
The short answer
An electronic logging device connects to the vehicle and records the driver's duty status automatically, using engine data such as whether the vehicle is moving. It replaced handwritten logs for most drivers subject to Hours of Service.
The point of the rule is accuracy. A paper log recorded what a driver wrote down. An ELD records what the truck did. Those are different things, and the gap between them was the problem the rule set out to close.
The Federal Motor Carrier Safety Administration sets the requirements — what the device must record, how records are transferred during a roadside inspection, and which operations are exempt. Exemptions exist and they are specific. Confirm current applicability against FMCSA guidance for your operation rather than assuming.
ELD is not the same as HOS
Worth separating clearly, because they get conflated:
- HOS is the rule — how long a driver may drive and be on duty
- The ELD is the instrument — it records what actually happened
The device does not change what is permitted. It changes how faithfully the record reflects reality, and therefore how much room there is for a log to say something convenient.
See Hours of Service basics for the rules themselves.
What you get beyond compliance
This is where most carriers under-use what they are already paying for. An ELD is connected to the engine, so the data usually extends well past duty status:
Hours remaining, live. The compliance artifact is the log. The operational value is knowing, before you assign a load, how much drive, shift and cycle time a driver actually has left. That turns HOS from a thing you reconcile afterwards into a constraint you plan against.
Engine fault codes. Many devices surface diagnostic trouble codes. A fault that appears on a Tuesday and is visible to whoever schedules maintenance is a very different situation from one discovered when the truck stops.
Location and movement history. Useful for customer updates without calling the driver, and — relevant to detention billing — as corroboration for arrival and departure times that a broker is less able to dispute than a driver-entered number.
Distance by jurisdiction. Because the device records movement continuously, it can support per-state distance figures, which is directly relevant to IFTA reporting.
Edits, and why they are constrained
Drivers can make limited corrections — duty status is sometimes genuinely misrecorded, and a system with no correction path would be unusable.
What is deliberately constrained is driving time captured automatically. It cannot simply be edited away, edits are tracked, and the driver certifies their records. The audit trail is the feature. A record that could be quietly rewritten would carry no more weight than the paper log it replaced.
The management implication: if your dispatch plan only works when a driver edits something untrue, that is a planning problem surfacing as a compliance risk.
Choosing and integrating
Two questions decide whether an ELD is an asset or a second system to log into:
Does it export the data you need? Duty status, HOS clocks, fault codes, distance by jurisdiction. If the data is trapped in the vendor's own dashboard, you will be re-keying it into whatever you actually run the business in.
Does your operational system consume it? An ELD whose data sits beside your dispatch board rather than inside it will get checked occasionally rather than continuously.
Where the software fits
TFS Fleet syncs from an ELD provider so hours-of-service clocks, engine fault codes and device inventory land in the same system as loads, drivers and maintenance — with a sync history showing what was pulled and what failed, so a silent integration failure is visible rather than assumed.
See Fleet & Telematics and Platform & Security.