This law requires certain types of vehicles, like trucks carrying goods or passengers for hire, to display the name or trademark of the person or company that operates them, on both sides of each vehicle. If a vehicle is being used under a rental agreement for less than 30 days, the operator's name doesn't have to be shown as long as the lessor's details and certain identification numbers are visible, and a copy of the rental agreement is kept in the vehicle for inspection.

If the federal regulations (Section 390.21 of Title 49) are followed, compliance with this state law is assumed. Additionally, any outdated or incorrect company information on the vehicles must be updated within 60 days of a change in ownership or operation.

This law requires that any name or trademark displayed must be clearly legible from 50 feet away during the day. The letters should stand out sharply against the background. However, you can also add more displays as long as they don't go against this rule.

This law states that certain rules in Section 27900 don't apply to vehicles that weigh 6,000 pounds or less when they're empty. It also doesn't apply to trailers pulled by these lighter vehicles, vehicles with special license plates like manufacturers or dealers plates, or vehicles operated by passenger stage corporations regulated by the Public Utilities Commission.

If you're driving a vehicle carrying hazardous materials like explosives or flammable substances and they're in quantities that need special signs (placards) on the vehicle, you have to display those signs as required by federal rules. But, don't use these signs unless the federal rules specifically say you should or must. There are exceptions, such as vehicles carrying only small amounts of certain powders or those exempt under a specific rule.

If you're using a pilot car, you need to have the company's name clearly visible on both the right and left sides of the car.

The name should stand out against the background and be easy to read from 50 feet away during the day. You can add extra markings, as long as they don't make the company's name harder to read.

This law outlines the requirements for signs on pilot cars escorting oversized loads. The signs must say either "OVERSIZE," "OVERSIZE LOAD," "WIDE LOAD," or "LONG LOAD," depending on the situation. These signs need to be neat, clean, and easy to read from the front or back at an angle. The background must be bright yellow, and the letters have to be black, at least 6 inches tall, and with a stroke width of at least 1 inch. The sign must be positioned at least 48 inches off the ground and have a minimum size of 440 square inches.

This law makes it illegal to have signs with the words "fire" or "fire department" on your vehicle unless it's used by official fire services. This includes vehicles owned by fire departments, districts, forestry services, or the State Fire Marshal’s Office, and even extends to private vehicles owned by members of these organizations.

This law requires that every school bus transporting students up to 12th grade must have a sign with the word “schoolbus” on the front and back, with letters at least eight inches tall. Other vehicles are not allowed to display this sign unless they are used to transport individuals with developmental disabilities to work or training centers.

Additionally, school buses must have a sign on the rear that says “Stop When Red Lights Flash,” with letters at least six inches tall to ensure visibility and safety for students.

When a youth bus is used to transport school students, it must have a clearly visible sign that says “YOUTH BUS” in letters that are at least eight inches high on both the front and back of the bus. The lettering should stand out against the background, making it easy to read.

This law allows schools to put signs on the back of zero-emission school buses that say the bus is environmentally friendly with zero emissions. The signs can also show what kind of clean fuel the bus uses. The California Highway Patrol can set rules about how big the signs can be and where they should go on the bus.

If you own or operate a tow truck, a repossession vehicle, or an auto dismantler tow vehicle in California, you must display a sign on both sides of the vehicle showing the company's or owner's name, address, and phone number. These signs must use letters and numbers that are at least 2 inches tall and stand out from the background color.

For licensed repossession agencies, you can use your agency's license number as issued by the Department of Consumer Affairs instead of your name, address, and phone number.

This law requires all taxicabs in California to display a sign that's easy for passengers to see. The sign must include the name, address, and phone number of the agency regulating the taxi, as well as the taxi firm's details. The sign must be at least 6 inches by 4 inches or another size specified by the agency. If more than one agency regulates the taxi, the sign should list the agency where the taxi operates most. A taxicab is defined as a vehicle for up to eight passengers, excluding the driver, used for hire, but it doesn't include charter-party carriers.

This law requires vehicles carrying liquefied petroleum gas (LPG) or natural gas (CNG or LNG) in a tank that's hidden, like under the car or in a trunk, to have labels on the outside showing what kind of fuel they use. The labels need to be in one-inch high block letters and in a contrasting color, placed near the tank location. Alternatively, the vehicle can have smaller labels (0.25 inches high) on each side stating the type of fuel. It’s also illegal to fill these fuel tanks in concealed areas unless the vehicle has these labels.

This law requires the California Highway Patrol to conduct a year-long study to find effective ways to enforce the Commercial Vehicle Registration Act of 2001. They must consult with several agencies and industry representatives to come up with recommendations. These suggestions must be delivered to the Legislature by July 1, 2003, to help ensure compliance with the act.