TLDR: A C31 license in California is a specialty contractor license issued by the Contractors State License Board. It authorizes a licensed contractor to perform construction zone traffic control work, including lane closures, traffic diversions, and the use of portable devices on public streets and highways.
What Does A C31 License Mean?
A C31 license is a California specialty contractor license that legally allows a zone traffic control contractor to prepare or set up construction zone traffic control on public roads. This includes everything from installing cones, delineators, barricades, and sign stands to operating flashing beacons, flashing arrow trailers, and changeable message signs on roadways. At California Traffic Safety, we hold both a C31 and D42 license. We take pride in meeting the highest safety standards in the industry.
Traffic control is a critical part of any construction or road project. Without a properly licensed contractor, job sites on public streets and highways can become dangerous for both workers and drivers.
What Work Does A C31 License Cover?
A C31 license covers a wide range of traffic control tasks. A traffic control contractor prepares or removes lane closures, flagging, or traffic diversions utilizing portable devices and equipment. That includes the use of cones, delineators, barricades, sign stands, flashing beacons, arrow trailers, and changeable message signs on roadways.
Here is a breakdown of what falls under this license:
- Setting up and removing lane closures on public streets and highways
- Flagging or traffic diversions utilizing portable devices
- Installing and managing cones, delineators, barricades, and sign stands
- Operating flashing beacons, flashing arrow trailers, and changeable message signs
- Controlling traffic flow during construction zone activity
- Ensuring compliance with California law and state safety regulations
This license applies to work on public conveyance routes, including highways, freeways, and local roads. Any contractor working in this space without the proper license risks serious legal and financial consequences under the Business and Professions Code.
Our team at California Traffic Safety is fully licensed and ready to assist with your traffic control needs. We serve Sacramento and all of Northern California.
Who Issues The C31 License?
The Contractors State License Board (CSLB) issues the C31 license. The CSLB operates under the authority of the Business and Professions Code and oversees all contractor licensing in the state. This board sets the standards for what a licensed contractor must know and demonstrate before being approved to perform specialty work.
To obtain a C31 license, applicants must pass both a trade exam and a business exam. The trade portion covers technical knowledge specific to c 31 construction zone traffic control work. The business test covers topics like California law, workers compensation insurance, business entity requirements, and contractor regulations.
Both exams are administered through the CSLB. Passing both is required before any license is granted.
How Do You Obtain A C31 License In California?
The process to obtain a C31 license in California takes preparation and time. Here is a general overview of the steps involved:
1. Meet The Basic Requirements
You must have at least four years of journeyman-level experience in the trade. That experience must be within the past ten years and relevant to 31 construction zone traffic control work.
2. Submit Your State Application
You will file your state application with the Contractors State License Board. The application includes your work history, business entity information, and payment of the initial license fee. Your business entity can be a sole proprietorship, partnership, corporation, or limited liability company.
3. Pass The Exams
The CSLB will schedule your exams after your application is approved. You will take both the business exam and the trade exam. The business exam tests knowledge of California law, workers compensation insurance, liens, contracts, and the Business and Professions Code.
4. Provide Proof Of Insurance
Applicants must show proof of workers compensation insurance and a contractor’s bond before the license is issued. This protects both the public and the business.
5. Receive Your License
Once all requirements are met and both exams are passed, your C31 license is issued. Licenses must be renewed every two years to remain active.
How Can You Prepare For The C31 Exams?
Preparing for both the business and trade exams takes dedication. Many applicants turn to practice tests, practice exams, and study materials to build confidence before test day. Resources like Contractors Intelligence School offer structured courses designed to help applicants pass the state exam on the first attempt.
Contractors Intelligence School and similar programs provide course materials, practice exams, and business exam prep. These programs are designed to walk you through the authority cited in California law, the Business and Professions Code, and trade-specific knowledge.
Using practice tests early in your prep process builds confidence. Strong study materials can be the difference between passing and having to retest. We encourage anyone entering the traffic control industry to invest in quality prep resources before attempting the state exam.
Why Does The C31 License Matter?
The C31 license exists to protect public safety. Construction zone traffic control is one of the most hazardous environments in the construction industry. Improper lane closures, incorrect placement of cones, delineators, barricades, sign stands, flashing beacons, and flashing arrow trailers can cause serious accidents.
California law requires that any contractor setting up or removing lane closures flagging or traffic diversions on public streets be properly licensed. This requirement is authority cited under the Business and Professions Code. Working without a license can result in fines, project shutdowns, and legal action.
Beyond legal compliance, the license signals professionalism. It tells clients, municipalities, and agencies that your company meets California’s safety standards. At California Traffic Safety, our C31 license is a point of pride. It reflects our commitment to safe, compliant, and professional traffic control contractor work across Northern California.
What Sets California Traffic Safety Apart?
We hold both a C31 and D42 license. We are also DBE, WBE, and SB-Micro certified. These certifications give our clients access to a fully certified and licensed contractor with a proven track record of safe job site management.
Our team manages lane closures, traffic diversions utilizing portable devices, and full construction zone traffic control for contractors, municipalities, and public works departments throughout Sacramento and Northern California. We supply and operate cones, delineators, barricades, sign stands, flashing beacons, arrow trailers and changeable message signs on roadways.
We also operate a full sign shop. Visit our sign shop page to learn more about our custom signage services.
For project-related questions or to get started with Caltrans-compliant traffic control, our team is ready to help.
Questions? Contact California Traffic Safety
If you need a licensed C31 traffic control contractor in Sacramento or Northern California, we are here for you. Whether you need help with lane closures, traffic diversions, or full construction zone traffic control, our experienced team has you covered.
Contact us today to discuss your project needs. Our team will walk you through our services and help you find the right solution.
California Traffic Safety 835 57th St, Sacramento, CA 95819 (209) 469-2663
Call us now or fill out our contact form. We look forward to helping keep your job site safe and compliant.