Trucking Terms Guide

ELD and HOS / Logs

Supporting Documents in trucking

Short answer: Business documents used to support or verify a driver's records of duty status.

Plain-English explanation

Supporting documents are the business records a driver must retain to verify or confirm the information recorded on their ELD logs. FMCSA requires drivers to keep supporting documents for the current 24-hour period and the previous 7 consecutive days. Common supporting documents include fuel receipts, bills of lading, dispatch records, toll receipts, and any paper records that show date, time, location, and driver identification.

With logs and hours, timing matters. A phrase may sound simple, but the ELD record, duty status, supporting documents, and roadside inspection context can change how it should be handled.

Why it matters in trucking

When a roadside inspector or FMCSA investigator reviews a driver's ELD, supporting documents are used to verify that the duty status entries match the actual trip. A driver whose ELD shows off-duty time but whose fuel receipt shows a purchase 200 miles from the listed location has a discrepancy that triggers further scrutiny. Missing supporting documents is itself a violation at an inspection.

A clean ELD log is easier to defend when the driver and office understand the vocabulary before an edit, annotation, or inspection request comes in.

Example in real use

A driver is inspected at a weigh station. The officer reviews the ELD and notices a segment of off-duty time during mid-afternoon. They ask for supporting documents for that day. The driver produces a fuel receipt from the same time period — it shows a location and time that matches the ELD record. The receipt corroborates the log. Without it, the inspector might have flagged the segment as a potential falsification.

Common mistakes or confusion

  • Discarding fuel receipts, BOLs, or toll records before the 7-day retention window is met — all supporting documents need to be available for inspection.
  • Not retaining electronic records in a format the inspector can review — photographed receipts on a phone are acceptable, but the driver needs to be able to access and show them.
  • Assuming the ELD alone is sufficient and that supporting documents are optional — they are required and their absence is a separate recordkeeping violation.

Related terms

Audit Trail A record of changes or events in a logging system that helps explain how driver log data changed. Duty Status A driver log category such as driving, on duty, off duty, or sleeper berth. Personal Conveyance Off-duty movement of a commercial motor vehicle for personal use when conditions are met. Yard Move A special driving status used for movement in a yard rather than over-the-road driving. On-Duty Not Driving Time when a driver is working but not driving, such as loading checks or inspections. Off Duty Driver time relieved from work responsibility and not performing carrier work.

Related guides

ELD and HOS Terms is the best next place to keep learning this topic.

Sources and last updated

HOS and ELD definitions reflect the current FMCSA Hours-of-Service Summary and ELD regulatory guidance, including the September 2020 final rule. See the sources page for full reference list.

Last updated: 2026-05-10