Assess what the driver knew or could reasonably have known immediately before starting the duty day or resuming driving after a qualifying rest break or sleeper-berth period, and what the carrier knew or could reasonably have known immediately before dispatch. Apply the full adverse-driving-conditions definition in 49 CFR 395.2 and keep the supporting facts. A routine 30-minute break is not a qualifying rest period for this definition.
What this means for your fleet
Use a pre-duty and dispatch-time weather and route check, a driver escalation point, and a written annotation standard. A foreseeable delay should not be relabeled after the fact merely because the trip ran late.
What the exception changes—and what it does not
For property-carrying drivers, qualifying adverse conditions may allow up to two additional hours beyond the 11-hour driving limit and 14-hour driving window to finish the run or reach a safe stopping place. Use only the additional time needed; the 60/70-hour cycle limits remain unchanged. Assess what the driver knew or could reasonably have known immediately before the duty day or driving after a qualifying rest break or sleeper-berth period, and what the carrier knew or could reasonably have known immediately before dispatch. An ordinary 30-minute break does not qualify. Keep the dispatch route and forecast, when the condition became known, the affected segment, and the driver’s annotation.
What to check
| Check | How to verify |
|---|---|
| 1. Record pre-duty and dispatch-time route and forecast | Retain the pre-trip route, dispatch plan, forecast or road information available before the run, and review timestamp. |
| 2. Identify the unexpected condition | Document the specific weather or traffic condition, location, time encountered, and why it was not reasonably known earlier. |
| 3. Note when it became known | Preserve the first driver or dispatch communication that identifies the condition and when the fleet learned of it. |
| 4. Confirm the applicable HOS window | Calculate the original and adjusted driving/window limits under the cited provision and obtain qualified review. |
| 5. Retain dispatch communications | Keep the message thread, route change, ELD events, annotations, and final disposition for the affected trip. |
Common failure modes
- Using the provision for routine congestion.
- Assuming bad weather automatically qualifies.
- Omitting an annotation and supporting context.
Limits and exceptions
Use this guide to plan your checks; it does not determine whether a legal exception applies, certify a record, or guarantee compliance, safety, savings, or audit results. Preserve original ELD records and edit history. Use the current rules to determine applicability and the manual for your installed device for operating instructions.
Sources and review date
Reviewed August 10, 2026. Check the latest rules and product information before changing your procedures or signing a contract.
- 49 CFR Part 395: hours of service and ELD requirements — Office of the Federal Register and U.S. Government Publishing Office.
- Editing, annotation, certification, and original-record preservation — Federal Motor Carrier Safety Administration.
- Factor ELD products, plans, and support — Factor ELD.