California Truck Accident Laws and Regulations Overview

The truck came out of nowhere, and now nothing about your life looks the way it did before. Medical bills are stacking up, your car is totaled, and somewhere on the other end of a phone line, an insurance adjuster is already working to pay you as little as possible. 

You did not cause this, but you are the one carrying it. At Wells Call Injury Lawyers, we know exactly how these cases work and how to fight back under California truck accident laws.

What Are Truck Accident Laws in California?

California truck accident laws draw from two sources: the California Vehicle Code, which governs vehicles operating on state roads, and federal regulations from the Federal Motor Carrier Safety Administration (FMCSA), which apply to commercial trucks crossing state lines. 

Both sets of rules set the legal standards for how trucks must operate. When a driver or company violates those laws, and someone gets hurt, those violations form the basis of a personal injury claim.

What Do California Truck Regulations Require?

California imposes specific operating standards on commercial trucks that go well beyond standard traffic laws. These rules exist because trucks weigh tens of thousands of pounds and require greater stopping distances, more road space, and tighter safety margins than passenger vehicles.

Weight and Size Limits

The California Vehicle Code caps the total weight of a commercial truck and its load at 80,000 pounds, with single-axle limits set at 20,000 pounds and tandem-axle limits at 34,000 pounds. Trucks must also stay within height, width, and length limits, with a general maximum height of 14 feet and a width of 8.5 feet. Overloaded trucks are harder to stop and more prone to rollovers; a weight violation on record can directly support a negligence claim.

Speed Limits

Commercial trucks on California highways are subject to lower speed limits than passenger vehicles. Under state law, large trucks are generally limited to 55 miles per hour on most California highways, regardless of the posted speed limit for other traffic. When a truck driver exceeds that limit and causes a crash, your truck accident attorney can use that violation to prove the driver was at fault.

Driver Qualifications and Licensing

Every commercial truck driver in California must hold a valid commercial driver’s license (CDL) issued by the California Department of Motor Vehicles (DMV). Obtaining a CDL requires:

• Passing written knowledge tests, 
• A vehicle inspection test, and 
• Road skills testing. 

CDL holders must also complete a medical examination every two years to confirm they are physically fit to operate a commercial vehicle. A driver operating without a valid CDL or with a disqualifying medical condition creates direct liability for both the driver and the trucking company.

How Do Federal Hours-of-Service Rules Apply to Truck Accident Laws in California?

Fatigue is one of the leading causes of large truck crashes, which is why federal rules place hard limits on how long commercial drivers can stay on duty. Under FMCSA regulations, property-carrying truck drivers may drive a maximum of 11 hours (during a 14-hour period) following 10 consecutive hours off duty. Drivers must also take a 30-minute break after 8 hours of driving. Weekly driving cannot exceed 60 hours over 7 days or 70 hours over 8 days.

Most commercial trucks must use electronic logging devices (ELDs) to automatically record driving time. When a crash occurs, ELD data can reveal whether a driver exceeded hours at the time of the collision, turning a federal violation into direct evidence of neglect.

Who Can Be Held Liable Under Truck Accident Laws?

Truck accident cases rarely involve just one responsible party. Injured people can pursue claims against every party whose negligence contributed to the crash, including:

• The driver. A driver who violates hours-of-service rules, exceeds speed limits, drives impaired, or fails to inspect the vehicle before a trip can be held personally liable.
• The trucking company. Under the legal doctrine of vicarious liability, carriers are responsible for their drivers’ conduct on the job. They also face direct liability when they push drivers past legal limits, fail to vet drivers, or neglect proper vehicle maintenance.
• The cargo loader. Improperly secured or overloaded cargo can cause a truck to shift or tip. When that happens, the party responsible for loading shares liability.
• The manufacturer. Defective brakes, tires, or other components that contribute to a crash can bring the manufacturer into the claim under California product liability law.

California’s pure comparative fault rule means that even if you share some responsibility for the accident, you can still recover compensation, but your percentage of fault reduces it.

Wells Call Injury Lawyers Have Gone Up Against the Trucking Industry and Won

Truck accident cases involve layers of liability that most firms are not prepared to untangle: federal regulations, carrier insurance policies, driver logs, and maintenance records all come into play before you even get to the question of fault. Wells Call Injury Lawyers has been handling serious injury cases in California for over 40 years, and our attorneys know how to dissect a trucking company’s compliance history and identify where the system failed. 

We recovered $150,000 for a client injured by a dangerous freeway driver, and our broader record of more than half a billion dollars recovered reflects the kind of persistence these cases require. We work on contingency, which means you pay nothing unless we win, and your first conversation with us is always a free case review.

Your Window to Act Is Shorter Than You Think

The moment a serious truck accident happens, the carrier’s insurer begins building a defense. Every day you wait is a day that evidence gets harder to recover and the other side gets further ahead. 

Contact Wells Call Injury Lawyers now for your free case review, and let our attorneys start pulling the records that tell the real story.

FAQs: Truck Accident Laws and Regulations in California

What laws apply to truck accidents in California?

California truck accident cases may involve both California traffic laws and federal trucking regulations. These rules govern truck weight limits, speed limits, driver qualifications, hours-of-service rules, maintenance requirements, and cargo safety. Violations can become important evidence in an injury claim.

How do truck accident laws differ from regular car accident laws?

Truck accident cases are often more complex because commercial trucks are heavily regulated. In addition to standard traffic laws, trucking companies and drivers must comply with federal safety rules covering driving hours, inspections, maintenance, cargo loading, and driver qualifications.

What are California truck speed limits?

Large commercial trucks in California are generally limited to 55 miles per hour on most highways, even if the posted speed limit for passenger vehicles is higher. Speeding violations may help establish negligence after a truck accident.

What are hours-of-service rules for truck drivers?

Federal hours-of-service rules limit how long commercial truck drivers can stay behind the wheel without rest. These rules are designed to reduce fatigue-related crashes. Electronic logging devices may help show whether a driver exceeded legal driving limits before a collision.

Who can be held liable in a California truck accident?

Liability may extend beyond the truck driver. Depending on the circumstances, a claim may involve the trucking company, cargo loading company, maintenance provider, vehicle manufacturer, or other parties whose negligence contributed to the crash.

Can trucking companies be responsible for a truck accident?

Yes. Trucking companies may be responsible if they failed to properly train drivers, ignored maintenance issues, pressured drivers to violate safety rules, or allowed unsafe vehicles on the road.

What evidence is important in a truck accident case?

Important evidence may include driver logs, electronic logging device data, maintenance records, black box data, inspection reports, witness statements, dashcam footage, police reports, and photographs of the crash scene.

What happens if a truck was overloaded or improperly loaded?

Improperly loaded or overloaded cargo can make a truck harder to control and increase the risk of rollovers or jackknife accidents. The company responsible for loading the cargo may share liability for the crash.

Can I still recover compensation if I was partly at fault for a truck accident?

Yes. California follows comparative fault rules, which means injured people may still recover compensation even if they share some responsibility for the accident. However, compensation may be reduced by their percentage of fault.

Why is it important to act quickly after a truck accident?

Truck accident evidence can disappear quickly. Driver logs, electronic data, maintenance records, and surveillance footage may be lost or overwritten if they are not preserved early. Acting quickly may help protect important evidence and strengthen a claim.

Legal References Used to Inform This Page:

To ensure the accuracy and clarity of this page, we referenced official legal and other resources during the content development process:

• Axle Limits, Cal. Veh. Code § 35550 (1996).
• Caltrans, Legal Basis for Truck Restrictions.
• Other Speed Laws, Cal. Veh. Code § 22406 (2001).
• State of California Department of Motor Vehicles, Commercial Driver Information: Becoming a Commercial Driver.
• Federal Motor Carrier Safety Administration, Hours of Service.
• Presumptions Affecting the Burden of Proof, Cal. Evid. Code § 669 (2025).
• Private Owners, Cal. Veh. Code § 17150 (2025).
• Several Liability for Non-Economic Damages, Cal. Civ. Code § 1431.2 (1986).