ELD Data: What It Can Show After a Truck Crash
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- An electronic logging device (ELD) records a commercial driver's duty status and driving time automatically.
- The federal ELD rule applies to most carriers and drivers who must keep records of duty status, with a few exceptions.
- FMCSA does not keep ELD data unless there's a violation, so the records are mostly held by the carrier.
- ELD records are one piece of evidence. Supporting documents such as fuel receipts, dispatch messages and bills of lading can add context.
- Records are kept for limited periods, which is why early preservation requests are common.
If you've ever wondered how anyone can say whether a truck driver was over their legal driving limit, the answer is increasingly a small device in the cab. Electronic logging devices have replaced handwritten logbooks for most drivers, and the data they create can become important after a serious crash.
This guide covers what the ELD rule says in plain English, what the devices record, who holds the data and what limits to keep in mind. It builds on our guide to federal hours-of-service limits. Educational information only.
What an ELD is
An electronic logging device connects to a commercial vehicle's engine and records when the vehicle is being driven. It automatically logs driving time and creates a digital record of duty status, which replaces the paper log drivers once filled out by hand. Under the federal rule, an ELD can be a smartphone or other wireless device if it meets the rule's technical requirements, and a portable ELD may be used.
Who has to use one
The ELD rule applies to most motor carriers and drivers who are required to keep records of duty status under the federal hours-of-service regulations. The Federal Motor Carrier Safety Administration lists limited exceptions, including:
- drivers who operate under the short-haul exceptions and use timecards instead of logs;
- drivers who use paper logs no more than 8 days in any 30-day period;
- drive-away-tow-away operations where the vehicle being driven is the item delivered;
- drivers of vehicles manufactured before model year 2000.
Drivers who are exempt from using an ELD generally still have to follow the hours-of-service rules and keep records when required, using paper logs or approved alternatives.
Who holds the data?
This matters after a crash. According to FMCSA, it won't retain ELD data unless there is a violation. In most situations the data sits with the motor carrier and its ELD provider. The carrier is also responsible for keeping the records for the period required by the regulations. Federal rules generally require carriers to keep records of duty status and supporting documents for at least six months, so confirm the current rule in 49 CFR Part 395 if timing matters in your case.
What the records can show
- when the driver started and stopped driving, and when they were on or off duty;
- total driving time against the daily and weekly limits;
- vehicle location information at certain moments;
- edits or annotations made to the logs and who made them.
On their own, these records don't tell the whole story. Lawyers and investigators often compare them with supporting documents: fuel and toll receipts, dispatch and text messages, bills of lading with pickup and delivery times, and hotel or expense records. Gaps or mismatches between those sources can raise questions.
Limits to keep in mind
- Logs can be wrong, incomplete or edited. That's why the supporting records matter.
- Some drivers are exempt from ELDs, and paper logs are easier to falsify than electronic ones.
- Records may not exist forever. Carriers keep them for limited periods and may overwrite other data such as dash camera footage.
Why early preservation matters
Since the carrier controls the data, an injured person can't simply download it. Attorneys typically send a formal preservation request asking the company not to destroy logs, ELD data, camera video and maintenance files. If you're dealing with a truck crash, consider speaking with a licensed attorney early, and keep your own records of the date, time and the truck's identifying information.
Filing deadlines also apply. Use our deadline finder as a starting point.
Frequently asked questions
Does every truck driver use an ELD?
No. Most do, but there are exceptions such as short-haul drivers using timecards and drivers of older vehicles.
Can I get the ELD data myself after a crash?
Usually not directly. The carrier or its provider holds it. Legal requests or preservation letters are the normal route.
Is ELD data proof the driver was too tired?
Not by itself. It's evidence of driving time that is weighed with other records and facts.
How long do carriers keep these records?
Federal rules set a minimum retention period, generally at least six months for records of duty status. Other records can be kept for different times.
Sources and references
- General Information about the ELD Rule, Federal Motor Carrier Safety Administration (fmcsa.dot.gov)
- ELD Exemptions, Waivers and Vendor Malfunction Extensions, Federal Motor Carrier Safety Administration (fmcsa.dot.gov)
- Summary of Hours of Service Regulations, Federal Motor Carrier Safety Administration (fmcsa.dot.gov)
- Your state's official sources: the state legislature's online statutes, your state court system's self-help pages, and your state insurance department.
Edited by Mohammed Khalaf, site editor. Written from the official sources listed above. The editor is not an attorney, and this article is not legal advice.
This article is educational and is not legal advice. We are not a law firm and do not refer or recommend lawyers. Laws differ by state and change over time. Read our Legal Disclaimer and Editorial Policy.