The date of the crash matters more than almost anything else in the file, because it starts every clock at once, and the clocks do not all run at the same speed. Most people hear two years and stop listening. That number is right for the ordinary case, a private driver in a private car, but it is wrong the moment a public entity is anywhere in the picture, and it says nothing about the shorter internal deadlines an insurer imposes on itself. A careful reader checks which of these applies before deciding how much time there is.
Two years against six months, and how to tell which one you are under
California's general limit for a personal injury lawsuit is two years from the date of the injury. That is the outer wall, the date after which a court will throw the case out no matter how good the facts are. Against that sits a very different rule for claims against a city, a county, the state, a school district or a transit agency, which requires a written claim delivered to the entity itself within six months. Miss the six months and the two years becomes irrelevant, because the lawsuit is barred before it starts.
The practical test is who owned the vehicle and who owned the road. A rear-end collision by a delivery van is one thing. The same collision by a municipal bus, a public works truck, a police cruiser, or a contractor working under a city permit is another, and so is a single-car wreck caused by a pothole, a dead signal, or vegetation blocking a stop sign. Anyone who reads their own file carefully is looking for a government seal on the other side, early, while the six months is still a long time and not a short one.
What the two clocks actually require of you
The two-year deadline is satisfied by filing a complaint in superior court. Nothing else counts. Not a demand letter, not a claim number, not an adjuster saying the file is still open and there is no rush, because an open claim file has no legal effect on the running of the statute. The six-month government deadline is different in kind: it is satisfied by presenting a written claim in a specific form to a specific office, and most agencies publish the form and the address. Once it is rejected, a separate and much shorter window to sue opens, usually six months from the rejection notice.
That second window is where careful people get caught, because the rejection letter arrives looking like ordinary mail and the deadline it triggers is measured from the day it was mailed. The letter is worth keeping with the envelope. The Federal Trade Commission oversees how consumer claims and settlements are advertised and handled, which is a reminder that paperwork sent to you carries dates that bind you, whether or not anyone explains them.
Shared blame reduces the number, it does not end the claim
California uses pure comparative fault, which means a plaintiff's own share of the blame is subtracted from the recovery as a percentage, and nothing more than that happens. Someone found twenty percent at fault for a hundred-thousand-dollar loss recovers eighty thousand. Someone found seventy percent at fault still recovers thirty. This is unlike states where being more than half responsible wipes the claim out entirely, and it is why an adjuster's early assertion that you were partly to blame is an argument about arithmetic rather than an announcement that you have no case.
What a careful reader checks, then, is not whether fault is disputed but what percentage the insurer has quietly written into its own evaluation. That number rarely appears in a letter. It shows up as an offer that is a third lower than the medical bills would suggest, or as a comment that both drivers were moving. Asking directly what percentage of comparative fault has been applied, and on what evidence, converts a vague discount into something that can be argued with a police report, a photograph, or a witness.
Where an attorney changes which clock you are on
The value of early legal advice in these files is mostly about identification, not advocacy. A lawyer looking at a crash report sees the public entity in a fleet number, spots that the six-month claim has to be presented, and files it while the facts are fresh. The same review sets the comparative fault fight up properly, preserving the intersection video before it cycles off, and locating the independent witness before the address goes stale. Handled early, both problems become schedule items rather than losses.
The date on the police report is the one to write down and work backward from.