What is the difference between telematics and an ELD?

Telematics is the general collection and transmission of vehicle data. An ELD is the US regulated device that records driving time from the engine; many ELDs are telematics units with the rule's functions added.

Does an ELD track a truck in real time?

Not under the rule. FMCSA's ELD rule records location at 60-minute intervals in motion, to about a 1-mile radius, and does not require real-time tracking.

The data network heavy vehicles' engines and controllers share. An FMCSA report describes it as running at 250 kilobits a second with up to 30 nodes connected.

Term

Telematics (fleet)

Telematics is the hardware and software that collect data from a vehicle — position, engine hours, mileage, speed, fuel — and send it to an office system. In US trucking, electronic logging devices are the regulated form: they synchronise with the engine to record driving time, and FMCSA describes a telematics-type ELD that transfers data wirelessly.

Also called fleet telematics, vehicle telematics, truck telematics, telematics device, J1939Updated 13 October 2026

What it collects

FMCSA's 2015 ELD rule requires engine synchronisation to capture power status, motion status, miles driven and engine hours, and records location at 60-minute intervals while the vehicle moves — to a precision of about a 1-mile radius during on-duty driving, for privacy. Heavy vehicles share engine data over the J1939 network, which an FMCSA report describes as running at 250 kilobits a second with up to 30 nodes. In the EU, the smart tachograph records the vehicle's position each time it crosses a member state's border and every three hours of accumulated driving.

Worked example: what the rule records against what tracking needs

Data	ELD rule (US)	Freight tracking
Position	Every 60 minutes in motion, about a 1-mile radius	Every few minutes, a few metres
Engine hours and miles	Recorded	Used for maintenance and fuel
Real-time tracking	Not required	The point of it
Cost (2015 estimate)	$419 a year for an ELD with telematics	Varies by provider

The ELD rule says plainly that it does not require real-time tracking of commercial vehicles: compliance data and visibility data overlap but are not the same. A shipper wanting live ETAs needs a feed built for that.

Does it make roads safer?

FMCSA forecast 1,844 crashes avoided and 26 lives saved a year when it adopted the ELD rule. A later study summarised by the University of Arkansas found the mandate may have also contributed to an overall increase in crashes, as drivers sped to fit their hours. The evidence is mixed.

The mistake people make

Assuming any registered device is compliant forever. ELDs are self-certified, and FMCSA removes devices from its registered list — five on 6 August 2026 alone. A fleet whose device is removed must replace it.

FAQ