Hours-of-Service (HOS)

Regulations limiting the time commercial drivers can spend on duty with required rest breaks.

It is the maximum amount of time commercial motor vehicle (CMV) drivers can spend driving or working each day to prevent fatigue and ensure road safety. 

Components of HOS 

  • Driving Time: The total duration a driver spends actively operating the vehicle.
  • On-Duty Time:
  • All work-related activities, including driving, loading/unloading, paperwork, and waiting for assignments.
  • Off-Duty Time: Periods when a driver is not working and can rest uninterrupted.
  • Recordkeeping: Drivers must maintain accurate logs of their daily activities, documenting driving time, on-duty time, and off-duty breaks.
  • Electronic Logging Devices (ELDs): Many regions mandate ELDs to electronically track and record HOS data, simplifying compliance.


  • A driver cannot drive for more than 11 hours after a 10-hour off-duty break.
  • An ELD automatically tracks a driver's activity throughout the day, alerting them when approaching HOS limits.

Benefits of HOS 

  • Enhanced Safety: Reduced driver fatigue lowers the risk of accidents.
  • Compliance with Regulations: Avoids fines and penalties for exceeding HOS limits.
  • Improved Driver Satisfaction: Ensures drivers receive adequate rest breaks.
  • Data-Driven Fleet Management: Helps track driver productivity and optimize schedules.
  • Reduced Operational Costs: Minimizes fatigue-related accidents and associated expenses.

Compliance with HOS is vital for safety and to avoid penalties.