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Commercial Traffic Laws in California

LEGALLY REVIEWED BY:
Callahan & Blaine
April 4, 2025

Commercial vehicle drivers have tremendous responsibilities on the roadway. They are in charge of operating very large vehicles on the highways and streets of California, and there are laws specific to commercial truck drivers that must be obeyed in order to ensure safety. Here, we want to discuss various aspects of California trucking laws and regulations that you need to be aware of, including hours of service, weight limits, and vehicle maintenance.

Definitions and Requirements

Commercial vehicles are defined as vehicles used for transporting property or persons for hire, compensation, or profit. In California, these vehicles are subject to a range of specific regulations and laws to ensure safety and compliance. This includes mandatory vehicle registration, driver licensing, and regular vehicle safety inspections. Additionally, commercial vehicles must adhere to hours of service regulations, which limit the amount of time a driver can operate to prevent fatigue. Weight and size regulations are also strictly enforced, and there are specific rules for the transportation of hazardous materials. To operate a commercial motor vehicle, drivers must obtain a commercial driver’s license (CDL) appropriate for the class of vehicle they will be driving.

Hours of Service Requirements for Commercial Truck Drivers

The Federal Motor Carrier Safety Administration (FMCSA) is responsible for setting specific guidelines in accordance with federal laws for how long commercial drivers are allowed to operate during each day and during a workweek. The state of California also has its own requirements, but they generally defer to federal guidelines in these cases. The hours of service requirements apply to commercial drivers who carry passengers as well as those who carry cargo. Any individual who operates a commercial motor vehicle weighing more than 10,001 pounds must adhere to the hours of service requirements.

These rules are put in place to ensure that drivers do not operate while fatigued behind the wheel. Unfortunately, without these laws, many commercial drivers and commercial truck and passenger companies would push the limits.

Speed Limitations

Commercial vehicle accidents are far more likely when these vehicles operate at excessive speeds. It is not uncommon to see the speed limit for a commercial vehicle in California 10 miles less than the normal speed limit for a roadway. In some cases, commercial vehicles are limited to 55 mph on highways.

Play speed limits are commonly imposed on semi-trucks, school buses, vehicles carrying hazardous materials, and farm labor vehicles carrying passengers.

Lane Rule

Individuals operating commercial vehicles, including larger trucks, buses, or vehicles with a second component in towing, are required to stay in the right-hand lane of the roadway or in the lane specifically designated for slower-moving vehicles. Commercial drivers operating on a road with four or more lanes must stay in the two right-hand lanes.

Cargo Rules under California Trucking Laws

In the state of California, it is required for truck drivers and trucking companies to ensure the following:

  • That any cargo is properly loaded and tied down
  • That the cargo or property is thoroughly inspected
  • That the cargo’s vehicle weight is properly distributed and secured on the truck

Vehicle Inspection Requirements

Ensuring the safe operation of commercial vehicles is paramount, and this begins with regular inspections and maintenance. The California Highway Patrol (CHP) and the California Department of Motor Vehicles (DMV) are responsible for enforcing these vehicle inspection requirements. Before each trip, drivers must conduct a thorough inspection of their vehicle to identify any potential issues. Trucking carriers are also required to perform regular maintenance and keep detailed logs of all completed inspections and repairs. These measures help prevent accidents and ensure that commercial trucks remain in safe working conditions.

Size and Weight Regulations

California enforces strict size and weight regulations for commercial vehicles to maintain road safety and infrastructure integrity. The maximum allowable weight for a commercial vehicle is 80,000 pounds, and the maximum length is 65 feet. Trucking companies must ensure their vehicles comply with these limits to avoid hefty fines and penalties. In some cases, larger or heavier trucks may require special permission from state or federal regulatory agencies. The specific size and weight limits can vary depending on the vehicle’s configuration, so it is crucial for trucking companies to stay informed and compliant.

Environmental Regulations

The California Air Resources Board (CARB) plays a critical role in regulating emissions from commercial trucks and buses. CARB regulations mandate that trucking companies use newer model engines and retrofit older engines with emissions-reducing technology to minimize environmental impact. Non-compliance with these regulations can result in significant fines and penalties. Additionally, commercial vehicles must adhere to federal environmental regulations, which include standards for fuel efficiency and emissions. By complying with these regulations, trucking companies contribute to a cleaner and healthier environment.

Insurance and Liability

Commercial trucks must meet specific insurance requirements set forth by the Federal Motor Carrier Safety Administration (FMCSA) and California state regulations. The amount of insurance required depends on the vehicle’s weight and the types of materials being transported. Trucking companies must ensure they have adequate coverage to protect against potential liabilities. In the event of a truck accident, a truck accident lawyer can help determine liability and ensure that victims receive fair compensation. Proper insurance coverage is essential for protecting both the trucking company and the public.

Proper Licensing for Commercial Driver’s License

In order to legally operate a commercial motor vehicle in California, commercial drivers must obtain their commercial driver’s license. If the commercial truck driver will only be operating within the state limits of California, they must be at least 18 years old. Any commercial truck driver crossing state lines, meaning trips between more than one state, must be at least 21 years of age.

To obtain a commercial driver’s license (CDL), a driver must first obtain their commercial learner’s permit and hold it for at least 14 days. In order to get this permit, the driver must already have a standard California driver’s license. The individual will have to complete an online application and then take a written knowledge test, medical exam, and vision test through the department of motor vehicles (DMV). The individual will have to get their fingerprints scanned, have their photograph taken, and pay an application fee.

After holding the commercial learner’s permit for the required amount of time, a driver can apply for the full CDL. Typically, drivers will have to take a skills test at the DMV to obtain the CDL.

Ensure Compliance with California’s Commercial Traffic Laws with Callahan & Blaine

If you are a commercial driver or trucking company operating in California, navigating the complex web of traffic laws and regulations is crucial to avoiding fines and ensuring safety. At Callahan & Blaine, our experienced attorneys understand the intricacies of California’s commercial vehicle laws and are committed to helping clients stay compliant with state and federal requirements. Whether you’re dealing with licensing issues, vehicle inspections, or liability concerns, we are here to provide the legal guidance you need.

With over 40 years of experience, Callahan & Blaine has successfully represented drivers and trucking companies in a wide range of commercial traffic-related matters. If you need assistance with understanding or addressing compliance issues, contact us today. Reach out at (714) 241-4444 or through our contact form to speak with one of our seasoned attorneys.

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Legally reviewed by:
Callahan & Blaine
April 4, 2025

Callahan & Blaine, established in 1984, is a leading litigation firm with a legacy of delivering exceptional results for our clients. With over 700 years of combined trial experience and a proven track record of more than $1 billion in verdicts and settlements, our team of highly recognized attorneys specialize in handling complex and high-stakes civil cases with unparalleled efficiency and skill.

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