The California Streets and Highways Code is the body of state law that divides control of public roads among Caltrans, the 58 counties, and California’s cities, and sets the rules for how roads are built, maintained, accessed, retired from public use, and protected from damage. It also sets penalties for building in a right-of-way without permission and for vandalizing roads or traffic devices. Because the code touches property rights, tort claims, and traffic fines, its rules reach well beyond engineers and public works departments.
Who Controls Which Road
Three levels of government share authority, and the first question in any road dispute is which one you are dealing with.
Caltrans manages the state highway system under Division 1 of the code.1Justia Law. California Code Streets and Highways Code – Division 1 – State Highways Section 230 identifies which routes qualify as state highways.2California Legislative Information. California Code Streets and Highways Code 230 – State Highways County boards of supervisors handle county roads under Section 941, which makes them responsible for establishing, recording, constructing, and maintaining highways necessary for public convenience. One detail matters a great deal: a road is not a county road until the board of supervisors formally accepts it into the county system, and the county has no maintenance liability for a road it has not accepted.3California Legislative Information. California Code Streets and Highways Code SHC 941 City councils manage municipal streets under Division 2.5.
Classification controls everything downstream: who you file a claim against, who issues your driveway permit, who you petition if you want a road closed, and whose standards apply to a project in front of your property.
Building Near or Connecting to a Public Road
The code treats the “highway” as the full width of the right-of-way, not just the paved surface.4California Legislative Information. California Code Streets and Highways Code 660 Anything placed inside that right-of-way without permission is an encroachment. The definition is broad: towers, poles, pipelines, fences, billboards, buildings, other structures or objects, and even special events like street festivals all qualify.
If you want a driveway to tie into a state highway, you need an encroachment permit from Caltrans, and Caltrans can deny the permit if the proposed access creates a safety risk. For local roads, cities and counties control access through zoning ordinances and subdivision rules.
What Happens If You Encroach Without a Permit
Caltrans has strong removal powers. It can immediately remove any encroachment that obstructs public use of the highway, consists of refuse, or is an unauthorized advertising sign. For other encroachments, the owner gets five days’ written notice to remove the obstruction. Miss the deadline and Caltrans can tear it out, bill you for the expense, and add $350 per day for every day the encroachment stayed up past the five-day window.5California Legislative Information. California Code Streets and Highways Code – Nuisance and Penal Provisions If you dispute the removal or refuse to comply, Caltrans can sue to have the encroachment declared a public nuisance and abated, recovering the same $350 daily penalty along with litigation costs.
Injuries From a Dangerous Road Condition
When a pothole, missing sign, failed signal, or other hazardous road condition causes an injury, Government Code Section 835 makes the responsible public entity liable if you can show four things: the dangerous condition existed when you were hurt, it caused your injury, the risk was reasonably foreseeable, and either a public employee’s wrongful act created the danger or the entity knew about the condition and had enough time to fix it.6California Legislative Information. California Government Code 835 – Liability for Injury Caused by Dangerous Condition of Public Property
The Six-Month Claim Deadline
You cannot just file a lawsuit against a California public agency over a road injury. Government Code Section 945.4 requires a written tort claim to the agency first, before any suit for money damages.7California Legislative Information. California Government Code 945.4 For personal injury, that written claim is due within six months of the injury. Miss the window and you will likely lose the right to sue at all, no matter how strong the underlying case. The agency then has 45 days to respond. Only after it rejects the claim, or stays silent long enough for the claim to be deemed rejected, can you go to court.
If the road belongs to a county that never formally accepted it under Section 941, there may be no liable public entity to claim against. Confirming who owns and maintains the road is the first step.
Toll Lanes and Carpool Access
Section 149.5 authorizes a value-pricing program that lets single-occupant vehicles pay to use designated high-occupancy vehicle lanes. Each administering agency sets its own toll structure, and tolling only applies during the hours the lanes are otherwise restricted to carpools.8California Legislative Information. California Code Streets and Highways Code SHC 149.5
The statute protects performance. The administering agency must maintain at least Level of Service C (free-flowing traffic) in the HOT lanes, though a written agreement with Caltrans can allow Level of Service D (moderate congestion). Caltrans audits peak-hour traffic performance at least once a year. Carpools keep unrestricted access at all times, though they may need a transponder for enforcement. Toll revenue goes first to operating costs, and administrative expenses are capped at 3 percent of revenue.
Safety Enhancement-Double Fine Zones
Certain stretches of highway are designated Safety Enhancement-Double Fine Zones under Vehicle Code Section 42010. Inside those zones, misdemeanor traffic fines are doubled, while infraction fines move up one category on the uniform traffic penalty schedule rather than being literally doubled. The enhancement applies only to the specific offenses the statute lists, including speeding, reckless driving, DUI, and improper passing, not to every infraction committed in the zone.9California Legislative Information. California Code Vehicle Code 42010 – Safety Enhancement-Double Fine Zones
When a Public Road Is Vacated
If a street in front of your home is being eliminated or you want one closed, the governing procedure is in SHC Sections 8300 through 8363.10California Legislative Information. California Streets and Highways Code – Part 3 Public Streets Highways and Service Easements Vacation Law A local legislative body starts the process on its own or in response to a petition from an interested person. The clerk sets a hearing at least 15 days out and publishes notice identifying the road’s general location, its name or common designation, and the extent of the proposed vacation.11Justia Law. California Code Streets and Highways Code 8320-8325 – General Vacation Procedure
At the hearing the body takes evidence. If it finds the road unnecessary for present or future public use, it may adopt a resolution vacating it. The resolution can impose conditions that must be satisfied before the vacation takes effect, and the clerk will not record it until those conditions are met.12California Legislative Information. California Code Streets and Highways Code 8324 Some vacated roads revert to adjacent property owners; others are repurposed as pedestrian paths or utility easements. A neighbor who believes a vacation would cut off access or hurt property value can appear at the hearing and, if needed, challenge the decision in court.
Vandalism of Roads and Traffic Devices
Damaging a road, sign, or traffic control device is prosecuted under California’s general vandalism statute, Penal Code Section 594. The penalty scales with the dollar amount of the damage:
- Damage under $400 is a misdemeanor punishable by up to one year in county jail, a fine of up to $1,000, or both.
- Damage of $400 or more can be charged as either a misdemeanor or a felony, with a fine of up to $10,000, or up to $50,000 if the damage reaches $10,000 or more.13California Legislative Information. California Penal Code 594 – Vandalism
Removal of an encroachment, by contrast, is a civil remedy. The two tracks can run at the same time: Caltrans can tear out an obstruction and bill you under the SHC while prosecutors separately pursue vandalism charges for the underlying damage.