Critical Evidence Guide

ELD & Logbook Evidence in Truck Accident Cases

Electronic logging devices create a detailed record of driving events, duty-status entries, edits, and vehicle data. That record can test a driver's timeline, but it must be read with supporting documents and the applicable hours-of-service rules.

Key Takeaways

Automatic and Manual Data: ELDs automatically record driving events and specified vehicle data. Drivers still enter non-driving statuses, annotations, and certifications.
Hours of Service: Drivers are limited to 11 hours of driving within a 14-hour window after 10 consecutive hours off duty.
Six-Month Rule: Carriers must retain ELD records and a separate backup for six months. Related telematics, video, and communications may have different schedules.
Entries Can Be Tested: Edit history, unidentified-driving events, diagnostics, dispatch records, receipts, and tolls can reveal inconsistencies that require explanation.

What ELDs Automatically Record

Compliant ELDs automatically capture specified events and vehicle data. They are not continuous crash recorders, and they do not automatically decide whether a driver complied with every rule.

Date & Time

Precise timestamp of every duty status change—on-duty, off-duty, driving, sleeper berth

Location

Required location records tied to status changes and intermediate events, with regulatory precision limits

Engine Hours

Cumulative engine-running time that can corroborate operation and help cross-check movement and duty-status records; idling also adds hours

Vehicle Miles

Odometer readings that cross-reference with other mileage records

Driver ID

Who was logged in, detecting unauthorized substitution or multiple-profile abuse

Edit History

All annotations, amendments, or corrections—and who made them

Federal Hours of Service Rules

Hours-of-service regulations limit driving and on-duty time for covered operations. They are one part of a fatigue investigation; exceptions and special provisions may change how a particular trip is analyzed.

Review the FMCSA hours-of-service summary →

Rule	Description	Limit
11-Hour Driving Limit	Maximum driving time after 10 consecutive hours off duty	11 hrs
14-Hour Driving Window	All driving must occur within 14 hours of coming on duty	14 hrs
30-Minute Break	Required after 8 cumulative hours of driving	30 min
60/70-Hour Limit	Weekly maximum on-duty time over 7/8 consecutive days	60-70 hrs
34-Hour Restart	Option to reset weekly hours with extended off-duty period	34 hrs off

ELDs record the events needed to review driving time. Whether the record shows a violation depends on the operation, the driver's entries, available exceptions, and the full duty-status history.

Dispatch instructions and delivery schedules should be compared with the log to determine whether anyone encouraged unsafe or unlawful driving.

How HOS Records Affect Liability

ELD data contains automatically recorded events as well as driver and carrier entries. Its value comes from comparing the original file, edits, annotations, and supporting records with the crash evidence.

Fatigue

A log may show excessive driving time or limited rest opportunity. Other evidence is needed to connect the record to fatigue and the crash.

Speeding

Location and time records can test the trip timeline. ELD location intervals are not a substitute for event data or a reconstruction of speed at impact.

Pattern Violations

Prior violations and the carrier's response may be relevant to notice, supervision, or compliance practices when tied to a recognized claim.

Dispatch Pressure

Comparing the log with dispatch communications can show whether schedules or instructions encouraged driving beyond lawful or safe limits.

Common ELD Manipulation Tactics

Some records contain misassigned driving time, unsupported categories, missing data, or edits that need explanation. Those issues should be tested before accusing anyone of falsification.

Tactic	How It Works	How We Detect It
Multiple Driver Accounts	Using another driver's login to hide driving time	Cross-reference with fuel receipts, GPS, and weigh station records
Personal Conveyance Abuse	Claiming off-duty status while actually hauling loads	Compare 'personal' mileage with load documentation and delivery times
Yard Move Exploitation	Driving miles under 'yard movement' exemption	GPS data showing highway travel during 'yard moves'
Device Disconnection	Unplugging ELD during driving, claiming malfunction	Gap analysis showing 'unidentified' driving entries
Co-Driver Substitution	Team drivers logging time under wrong name	Compare driver logs with rest facility receipts and cell phone tower data

Forensic Analysis Is Key

We compare ELD records with fuel receipts, toll records, weigh-station information, delivery documents, dispatch data, and other lawfully obtained evidence. An inconsistency is a lead to investigate, not automatic proof of fraud or fault.

Preserving ELD Evidence

6 mo

Federal retention requirement

Backup

Separate copy required for six months

Varies

Retention for related video, messages, and telematics

What to Request

Driver's ELD data for the relevant period before and through the crash, including enough history to evaluate the applicable hours-of-service limits
All edits, amendments, and annotations to logs
Dispatcher communications regarding schedules and loads
Evidence of ELD malfunctions or "unidentified driver" entries
Carrier's HOS compliance audit reports
Raw data files from ELD provider—not carrier-generated summaries

Preserve the native record: Request the carrier's original ELD output, separate backup, edit history, annotations, unidentified-driving events, and supporting documents. If a provider possesses additional relevant data, formal process may be available. Our evidence matrix for truck crashes places those files alongside dispatch records, telematics, physical evidence, and separately held records.

FMCSA explains that carriers must keep ELD records and backup data for six months. Read the retention guidance →

Frequently Asked Questions

An Electronic Logging Device (ELD) synchronizes with the vehicle and automatically records driving time and specified data such as date, time, location, engine hours, and vehicle miles. Drivers still enter non-driving duty statuses and certify records. In a crash case, the data can help test hours-of-service compliance and rest opportunity, but it does not by itself prove fatigue or causation.

Federal regulations require motor carriers to retain ELD records of duty status and a separate backup for six months. Other records—such as detailed telematics, video, messages, or vendor audit logs—may follow different retention schedules, so a prompt, specific preservation request still matters.

ELDs preserve edits, annotations, unidentified-driving events, and diagnostic information, but the records still require analysis. Personal conveyance and yard-move categories can be legitimate. Investigators compare the original data and edit history with dispatch records, receipts, tolls, and other evidence before deciding whether an entry is inaccurate.

Paper logs rely on manual entries. A compliant ELD automatically records driving time and specified vehicle events, while drivers still enter non-driving statuses and certify the record. ELDs add useful safeguards and audit information, but they do not make every entry self-proving.

A preservation request should identify the carrier's ELD records, backup, edits, annotations, unidentified-driving events, diagnostic data, and supporting documents. In litigation, those records may be obtained through discovery, and a provider may be subpoenaed if it possesses relevant data and the procedural requirements are met.

Need to Preserve Critical ELD Evidence?

We preserve and compare the native ELD file, backup, edits, supporting documents, schedules, and crash evidence.

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