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The federal hours-of-service regulations allow commercial vehicle drivers an additional two hours to safely complete a run when they encounter adverse driving conditions.
This regulation applies to drivers operating property-carrying or passenger-carrying commercial motor vehicles (CMVs) in interstate commerce who encounter adverse driving conditions.
Property-carrying CMVs: Drivers of property-carrying CMVs who encounter adverse driving conditions and cannot safely complete the run within the 11-hour driving time limit or 14-hour duty window may increase their driving time and duty window by up 2 hours to make up the time that was lost.
When using this exception, the driver of a property-carrying CMV may not drive:
Passenger-carrying CMVs: Drivers of passenger-carrying CMVs who encounter adverse driving conditions and cannot safely complete the run within the maximum 10 hours of driving or 15 hours of on-duty time may increase their driving and on-duty time by up to 2 hours to make up the time that was lost.
When using this exception, the driver of a passenger-carrying CMV may not drive:
Drivers in Alaska. A CMV driver in Alaska who encounter adverse driving conditions may drive for the length of time needed to complete the run. After the run is completed, the driver must be off duty for: