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California Personal Injury Blog

Truck Driver Fatigue Laws (California and Federal)

By Ralph Curtis
Jun 17, 2025
Truck Accidents
truck-driver-fatigue-laws

Truck driving is considered one of the most dangerous jobs in America due to the long time drivers must spend driving. Fatigued driving can cause severe accidents where victims may be able to sue a trucking company for letting a driver operate while fatigued. That is why how many hours a driver can drive is tightly controlled by both Federal and California state regulation.

California Hours of Service (HOS) Rule for Truck Drivers

California Vehicle Code § 34501.21 is the law passed by the California Legislature that establishes the legal mandate for hours-of-service (HOS) rules in California defined by CHP’s California Code of Regulations (CCR), Title 13, § 1212.5 the following limits:

  • 12-hour driving limit: California allows intrastate drivers to drive up to 12 hours in a workday.
  • 16-hour on-duty limit: The total on-duty time for a California intrastate driver is capped at 16 hours in a 24-hour period.
  • 80-hour/8-day limit: Instead of the 60/70-hour rule, California intrastate drivers have an 80-hour on-duty limit within any 8-consecutive-day period.

Additionally, California law requires employers to provide their truck-driving employees with paid 10-minute rest breaks for every four hours worked, or major fraction thereof, and a 30-minute meal break for shifts longer than five hours.

US Federal Regulations on Fatigued Driving (HOS Rules)

The Federal Hours of Service (HOS) rules, established by the Federal Motor Carrier Safety Administration (FMCSA), primarily regulate the hours of truck drivers. These rules apply to interstate commercial drivers, including those operating across California.

Key Federal HOS Regulations for Property-Carrying Drivers

These rules include:

  • 11-hour driving limit: A driver may drive a maximum of 11 hours after 10 consecutive hours off duty.
  • 14-hour limit: The 11 driving hours must occur within a 14-hour window following 10 hours off duty.
  • 30-minute break rule: Drivers must take a 30-minute break after eight cumulative hours of driving.
  • 60/70-hour weekly limit: Drivers may not drive after 60 hours in 7 days or 70 hours in 8 days, depending on the carrier’s operation schedule.
  • Sleeper berth provision: Drivers using a sleeper berth must spend at least 7 hours in the berth and an additional 2 hours either in the berth or off duty.

Proving Truck Driver Fatigue

Even with strict hours-of-service regulations, proving that a truck driver was actually fatigued at the time of a crash can be challenging. Drivers may be partially at fault such as when they drive in a truck’s no zone. This is where a truck’s event data recorder, commonly known as a black box, becomes invaluable. Commercial trucks are equipped with electronic control modules that continuously record critical information, including vehicle speed, brake application, engine RPM, throttle position, and steering input in the seconds before a collision. This objective data cannot be disputed by a trucking company’s version of events.

When combined with Electronic Logging Device (ELD) records and GPS tracking, black box data truck accident investigations can reveal a clear picture of whether a driver violated HOS rules, was speeding, or failed to brake in time. If the black box shows a driver exceeded their 11-hour driving limit or operated beyond their 14-hour on‑duty window, it provides powerful evidence of negligence. This data can also contradict false statements made by the trucking company or its insurer, helping your attorney build a strong case for maximum compensation.

Sources Cited:

  1. https://california.public.law/codes/vehicle_code_section_34501.2