Separate a surprise from a planning failure
Learn what qualifies for the adverse-driving exception.
Unexpected road, weather, or traffic conditions
The adverse-driving exception can extend the eleven-hour driving limit and fourteen-hour window by up to two hours. It is for qualifying unexpected conditions that disrupt a run, not a trip that was already too long.
Neither the driver nor the carrier could reasonably have known about the condition at the relevant decision time. For the driver, check immediately before the duty day or driving after qualifying rest. For the carrier, check immediately before dispatch.
The cause of a delay matters as much as its length. Compare what was reasonably knowable.
Similar delays can have different causes
| Delay | Assessment |
|---|---|
| A sudden crash closes the route after departure | May qualify as an unexpected condition |
| Normal rush-hour congestion | Usually foreseeable |
| Unexpected severe snow | Check what was reasonably knowable |
| Announced daily construction closure | Usually foreseeable |
Traffic can qualify when it is unusual and unexpected. Snow does not automatically qualify just because it is snow.
Explain why the delay was unexpected
Record what happened, where and when, what was expected before departure, and how the delay affected the run. Then check the extension’s limits in the next lesson.