Car Accidents Caused by Defective Roads in California — Who Is Liable?

Not every car accident is caused by a driver's mistake. Sometimes the road itself is to blame — a dangerous pothole, missing guardrail, faded lane markings, or poorly designed intersection. When a government agency's negligent road maintenance or design contributed to your accident, you may have a claim against that agency. But the rules are very different from suing a private driver.

Common Dangerous Road Conditions That Cause Accidents

• Potholes — cause tire blowouts, loss of control, and swerving collisions
• Crumbling or uneven pavement
• Missing, faded, or confusing lane markings
• Inadequate or missing guardrails — especially on mountain roads and overpasses
• Malfunctioning traffic signals
• Inadequate or obstructed signage
• Dangerous intersection design — blind spots, poor sight lines, insufficient turn lanes
• Construction zone hazards — inadequate warning signs, improper lane closures, debris
• Standing water and drainage failures
• Overgrown vegetation blocking sightlines
• Inadequate lighting on known high-crash segments

Who Is Responsible for California Roads?

Road maintenance responsibility in California is divided by road type:

• State highways and freeways (I-10, I-15, SR-91, etc.): California Department of Transportation (Caltrans)
• County roads: Individual county public works departments
• City streets: Individual city public works departments
• Federal highways: Federal Highway Administration (rare, but sometimes applicable)
• Toll roads (91 Express, 10 Toll, etc.): RCTC/OCTA — these are semi-private and have different rules

The 6-Month Government Claim Deadline — Critical

Suing a government agency in California requires a specific prerequisite under the Government Claims Act (Government Code § 911.2): you must file a government tort claim within 6 months of the date of the accident.

This is not the same as filing a lawsuit. It is an administrative claim form filed directly with the agency. If you miss this 6-month window, you almost certainly lose your right to sue the government entity — permanently.

The Dangerous Condition of Public Property Standard

Under California Government Code § 835, a government entity is liable for injuries caused by a dangerous condition of its property if:

1. The property was in a dangerous condition at the time of the accident
2. The dangerous condition created a reasonably foreseeable risk of injury
3. The entity had actual or constructive notice of the condition in sufficient time to fix it
4. The entity failed to take reasonable action to protect against the danger

Actual notice means the agency knew about it (complaints, prior accident reports). Constructive notice means the condition existed long enough that a reasonably diligent inspection would have discovered it.

Prior Accidents at the Same Location

If other accidents have occurred at the same location — a notoriously dangerous intersection, a pothole that's been reported multiple times, a guardrail that's been missing for months — this prior history is powerful evidence that the agency had constructive notice and failed to act.

Design vs. Maintenance Claims

There are two types of road condition claims:

• Maintenance failure: The road deteriorated over time and wasn't fixed. (Pothole, faded lines, broken signal.)
• Design defect: The road was built incorrectly from the start. These are harder to win but can be worth more — and the government's design immunity defense doesn't always apply.

Can You Sue Both the Other Driver and the Government Agency?

Yes. If another driver was also at fault (e.g., they were speeding and hit a pothole, losing control and hitting you), you can sue both the driver and the relevant government agency. Under California's pure comparative fault rules, the jury apportions fault between both defendants — and you recover from each according to their percentage of liability.