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California Truck Lane Restrictions: A Guide to Semi Truck Regulations

LEGALLY REVIEWED BY:
Callahan & Blaine
April 2, 2025

When you are driving on the highway, it can be stressful to be around larger semi-trucks and other large vehicles on the roadway. The California Vehicle Code governs truck lane restrictions to ensure safer traffic flow. These vehicles can weigh tens of thousands of pounds and reach lengths of up to 75 feet. Accidents with larger vehicles can lead to serious injuries or even fatalities. In California, the state has passed laws that limit which lanes their large trucks can use in an effort to ensure safer traffic flow. If you will be driving on California highways, it is important to understand what the state’s truck lane restrictions are. In the event you are injured in an accident caused by a negligent truck driver, speak with a skilled Santa Ana truck accident lawyer as soon as possible to learn your legal rights.

california truck lane restrictions

Overview of California Semi Truck Regulations

California has implemented a comprehensive set of regulations to ensure the safe operation of semi-trucks on its highways. These rules cover various aspects, including weight, height, width, length, and lane usage. The California Highway Patrol (CHP) plays a crucial role in enforcing these regulations, working diligently to prevent truck accidents, preserve road infrastructure, and facilitate smooth traffic flow. For truck drivers, understanding and adhering to these regulations is essential to maintaining a safe driving environment and avoiding potential penalties. By following these guidelines, both truck drivers and other road users can contribute to safer highways across the state.

Understanding California Truck Lanes Restrictions

California is the most populated state in the US and boasts the largest economy of all the states. This means that there is a particularly large number of commercial vehicles traveling the highways around California. Unfortunately, when we look at data available from the Federal Motor Carrier Safety Administration (FMCSA), we can see that there were more than 77,000 injuries and 4,649 total fatalities in the US caused by commercial trucks during the latest year of data available.

The state of California restricts which lanes larger and heavier vehicles are allowed to travel in. In some areas of the state, California does not allow slower-moving vehicles to use the left lanes of the highway. These lanes are often reserved for vehicles that need to pass slower-moving vehicles on the highway. It is crucial for trucks to use the designated lane to avoid penalties and ensure safety on the road.

Lanes reserved strictly for larger vehicles will depend on the total number of lanes on each highway. If there are three or fewer lanes traveling in the same direction (not including carpool lanes), the trucks must use the far-right Lane. If there are four or more lanes traveling in each direction on the highway, trucks are allowed to use the two right-hand lanes. Trucks must use the designated lane when overtaking and passing.

California has also passed laws that require any slower-moving vehicle to use the right-hand lanes of a highway, regardless of the vehicle’s size. On Interstate 5, which connects Southern and Northern California, there are “truck-only lanes” that entirely separate large commercial vehicles in order to help keep the roads safer and stabilize the flow of traffic. Specifically, these lanes are located at:

  • Northbound and southbound 1-5 in Los Angeles County at the State Route 14 split.
  • Southbound I-5 in Kern County at the State Route 99 junction.

Truck-only lanes exist in California as a strategic measure to enhance road safety and navigation for larger vehicles. They operate separately from general traffic to facilitate safer merging and driving for trucks.

There are two truck-only lanes in California, specifically located at the northbound and southbound I-5 in Los Angeles County at the State Route 14 split and the southbound I-5 in Kern County at the State Route 99 junction.

Truck drivers will see black and white signs that direct them to truck-only lanes on specific areas on Interstate 5. Passenger vehicles are not prohibited from using truck-only lanes, but this is not recommended.

Truck Speed Limits in California

In California, the maximum speed limit for trucks is set at 55 miles per hour (mph) on most highways. This speed limit applies to commercial trucks with three or more axles, including semi-trucks, buses, and RVs. The rationale behind this speed limit is to enhance safety and reduce the likelihood of truck accidents. Truck drivers must adhere to this maximum speed limit to avoid fines and penalties. By maintaining a controlled speed, truck drivers can ensure safer travel for themselves and others on the road, contributing to a more orderly and secure traffic environment.

Who Regulates California Truck Lanes?

The California Highway Patrol is responsible for enforcing all commercial truck lane restrictions on highways throughout the state. The CHP has specific units and vehicles tasked with commercial vehicle enforcement. Truck tractors, which can pull semitrailers or combinations of trailers, are subject to specific length and speed regulations to ensure safety on the roads. Larger vehicles that violate the laws set in place regarding speed and restricted lane travel can be ticketed and fined by the CHP. Truck tractor drawing, in particular, is regulated under California’s vehicle code, with specific speed limits and safety measures implemented to protect motorists on highways and address the unique challenges posed by large vehicles.

Are There Any Federal Laws Regarding Truck Lanes?

Any large commercial truck that operates across state lines (which is a majority of the trucks in California) must also adhere to regulations put forth by the FMCSA. However, the federal government does not have any regulations in place regarding which lanes trucks must operate in. This matter is left to the states to decide. However, the FMCSA does strictly regulate a truck driver’s hours of service (HOS) as well as the inspection and maintenance requirements for truck owners and operators.

Consequences of Non-Compliance

Failure to comply with California’s semi-truck regulations can lead to severe consequences, including fines, penalties, and even accidents. Non-compliance can result in:

  • Fines: Up to $100 for the first offense, up to $200 for the second offense within a year, and up to $250 for the third offense in the same year.
  • Penalties: Points on the driver’s license, increased insurance premiums, and potential loss of driving privileges.
  • Accidents: Non-compliance can lead to truck accidents, which can result in injuries, fatalities, and significant damage to property.

It is crucial for truck drivers and companies to comply with California’s semi-truck regulations to ensure a safe driving environment and avoid the serious consequences of non-compliance. By following the rules, truck drivers can help prevent accidents and maintain their driving privileges, contributing to safer roads for everyone.

Why Choose Callahan & Blaine for Truck Accident Cases

If you’ve been involved in a truck accident caused by the negligence of a truck driver or their company, you need an experienced legal team on your side. At Callahan & Blaine, we have a proven track record of securing multi-million dollar verdicts and settlements for our clients in complex personal injury cases, including those involving commercial truck accidents. Our attorneys are committed to holding negligent parties accountable and ensuring you receive the compensation you deserve.

With over 40 years of experience, Callahan & Blaine is one of the premier litigation firms in California. Our team of skilled attorneys has successfully handled many truck accident cases, navigating the intricacies of state and federal regulations to provide expert legal representation. If you’ve suffered injuries or damages in a truck accident, don’t hesitate to reach out to us. Call (714) 241-4444 or contact us via our contact form today to discuss your case with a senior attorney.

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Legally reviewed by:
Callahan & Blaine
April 2, 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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