Guide · California
How Fault Is Decided in California Car Accidents
Pure comparative negligence, the evidence that decides fault, and how to respond when you are blamed.
Updated . General information, not legal advice about your situation.
Legal review: Elham Azimy, California State Bar No. 207274 (law and claims only).
California is a “fault” state for car accidents: the person whose negligence caused the crash (through their insurer) pays for the harm. It is also a pure comparative negligence state, which means fault can be divided in any proportion and an injured person can recover even if they were mostly at fault—reduced by their share. How that share is decided is the central fight in many claims.
The legal framework
Civil Code § 1714 makes everyone responsible for injuries caused by their lack of ordinary care. Since Li v. Yellow Cab (1975), California applies pure comparative negligence: a plaintiff 30% at fault recovers 70% of their damages; a plaintiff 80% at fault recovers 20%. There is no bar at 50% as in many states. Where several defendants are at fault, each is fully liable for economic damages (medical bills, lost wages) but, under Proposition 51 (Civil Code § 1431.2), only for their own share of non-economic damages (pain and suffering).
How fault is actually determined
There is no official fault finding in most crashes. The police report may state the officer’s opinion of the primary collision factor and cite a Vehicle Code section, and insurers rely heavily on it, but it is not binding and is often inadmissible in court as an opinion. Insurers assign fault from:
- The police report and any citations issued.
- Statements of the drivers and witnesses.
- Physical evidence: damage location and pattern, skid marks, debris field, final rest positions.
- Photos and video: dash cams, traffic cameras, business cameras, phones.
- Vehicle event data recorders (“black boxes”) in serious cases.
- Vehicle Code rules of the road: who had the right of way, who was speeding, who was following too closely.
Disputed fault in serious cases is resolved by accident reconstruction experts and, ultimately, a jury.
Common scenarios
| Scenario | Usual starting presumption | Common counterarguments |
|---|---|---|
| Rear-end collision | Rear driver (§ 21703, following too closely) | Sudden stop without reason, reversing, brake lights out, multi-car chain |
| Left turn across traffic | Turning driver (§ 21801) | Oncoming driver speeding or ran the light |
| Red light / stop sign | Driver who ran it (§ 21453, § 22450) | Conflicting witness accounts; signal timing |
| Lane change / sideswipe | Driver who changed lanes (§ 22107) | Other driver sped up, both changed lanes |
| Pedestrian in crosswalk | Driver (§ 21950) | Pedestrian stepped out suddenly, outside crosswalk, dark clothing |
| Unsafe speed in any crash | Speeding driver shares fault (§ 22350) | Speed not causal |
When the insurer blames you
The other driver’s insurer has a financial interest in assigning you fault, and it is common to receive a letter stating that you were 20%, 50% or 100% responsible based on their insured’s version. Respond with evidence, not argument: the report, photos, witness contacts, video. Do not accept a fault allocation in a recorded statement. If your own insurer paid your property damage, it will pursue the other insurer for reimbursement and may arbitrate fault through an inter-company process—your own insurer’s position on fault can help your injury claim.
Special rules
- Seat belts: failure to wear one can reduce damages for injuries the belt would have prevented (the “seat belt defense”), though not for the crash itself.
- Helmets: California requires motorcycle helmets; not wearing one can reduce head-injury damages.
- Uninsured drivers: under Proposition 213 (Civil Code § 3333.4), an uninsured driver injured in a crash cannot recover non-economic damages from an at-fault driver, even if blameless—only medical bills and lost wages. Exceptions apply, including when the at-fault driver was convicted of DUI.
- Employers: a driver working at the time makes the employer vicariously liable (respondeat superior).
- Vehicle owners: owners who lend their car are liable up to statutory limits for the borrower’s negligence (Vehicle Code § 17150).
- Public entities: liable for dangerous conditions of public property under Government Code § 835, with a six-month claim deadline.
Common questions
The police report says I was at fault. Is the case over?
No. The officer’s opinion is persuasive to insurers but not binding, and it can be wrong or based on incomplete information. Evidence that contradicts it—video, witnesses, physical evidence—can change the allocation.
I was partly at fault. Can I still make a claim?
Yes. California reduces your recovery by your percentage of fault but does not bar it. Someone 40% at fault recovers 60% of their damages.
No ticket was issued. Does that mean no one was at fault?
No. Officers often do not cite for collisions they did not witness. Fault is a civil determination made separately from traffic citations.
Describe what happened. Attorney Elham Azimy reviews every inquiry personally and, if we can help, calls you to talk it through. Free evaluation; no fee unless we recover for you.
Sources and official resources
- Civil Code § 1714 (general duty of care / negligence)
- Vehicle Code § 21703 (following too closely)
- Vehicle Code § 21801 (left turns and U-turns must yield)
- Vehicle Code § 21453 (red signal)
- Vehicle Code § 21950 (duty to yield to pedestrians in crosswalks)
- Vehicle Code § 22350 (basic speed law)
- Civil Code § 3333.4 (Proposition 213 limits for uninsured drivers)
- Government Code § 911.2 (six-month claim deadline against public entities)
Links go to official government, court and public-health sources. Laws change; verify current text before relying on it.