9th Circuit Upholds FMCSA Preemption of California Driver Break Rules
On June 4, 2026, the 9th Circuit upheld FMCSA's preemption of California break rules for passenger drivers.
Why it matters: This ruling clarifies for in-house counsel and transportation clients that federal law overrides California's stricter meal and rest break mandates, simplifying compliance in interstate operations.
- June 4, 2026: The 9th Circuit unanimously upheld FMCSA's preemption of California meal and rest break (MRB) rules for passenger commercial drivers.
- The FMCSA preemption followed a 2019 petition from the American Bus Association citing conflicts with federal safety regulations and interstate commerce burdens.
- California’s MRB rules require more frequent breaks than federal hours-of-service rules, creating legal conflict the court resolved by favoring federal law.
- The ruling affirms the 2021 9th Circuit precedent in International Brotherhood of Teamsters v. FMCSA supporting federal preemption over state driver break rules.
On June 4, 2026, the U.S. Court of Appeals for the Ninth Circuit issued a unanimous decision affirming that the Federal Motor Carrier Safety Administration (FMCSA) has the authority to override California's meal and rest break (MRB) rules for passenger-carrying commercial motor vehicle drivers. This means California's break requirements, which mandate specific meal and rest periods, are preempted by federal law for these drivers. The court's opinion found that these state break rules conflict with federal hours-of-service regulations, which set the national standard.
The FMCSA’s preemption action originated from a December 21, 2018 determination responding to a 2019 petition from the American Bus Association (ABA). The ABA argued that California's MRB rules imposed operational difficulties and disrupted interstate commerce for passenger transport companies. According to the ABA's statement, this decision eases regulatory conflicts for carriers operating across state lines.
This ruling extends the 9th Circuit's 2021 decision in International Brotherhood of Teamsters, Local 2785 v. FMCSA, which confirmed FMCSA's federal preemption powers over California's MRB rules for trucking drivers. Here, the court noted that federal regulations intend to provide uniform safety standards nationwide, and state rules creating stricter or different mandates can be overridden.
The term "preemption" means federal law overrides conflicting state laws in regulated fields to ensure consistent national standards. The MRB rules require breaks beyond federal hours-of-service rules, and the court found these additional state rules interfere with federal objectives.
California Attorney General Rob Bonta emphasized the state's interest in driver welfare but acknowledged that federal preemption limits California's ability to enforce its own break standards on passenger commercial drivers. This decision highlights ongoing legal and regulatory challenges balancing worker protections with uniform interstate commerce regulation.
For legal professionals advising transportation clients, this ruling reinforces that compliance efforts must prioritize federal FMCSA standards over California's more restrictive break rules for passenger vehicle operators.
By the numbers:
- June 4, 2026 — Date of 9th Circuit ruling upholding FMCSA preemption
- 2019 — Year American Bus Association petitioned FMCSA to preempt California rules
- 2021 — Year of related 9th Circuit precedent supporting federal preemption
Yes, but: While this ruling clarifies federal preemption for passenger drivers, California's MRB rules still apply to other employees, maintaining some state-level labor protections outside FMCSA's regulatory scope.
What's next: Legal observers expect similar challenges to surface in other states with strict driver break laws; transportation legal teams should monitor federal and state regulatory developments closely.