Seventy-Thirty, Fifty-Fifty: How a Split-Fault Crash Runs Through 30/60/15

Many crashes are not one driver's fault. Both drivers were a little fast, one changed lanes late, one braked hard. California handles that with shares of fault, and those shares meet your limits in ways worth working through before you rely on 30/60/15.

What the law recognizes

Civil Code 1431.2 refers to actions for personal injury, property damage or wrongful death "based upon principles of comparative fault." It makes each defendant's liability for non-economic damages, such as pain and suffering, several only, meaning in direct proportion to that defendant's percentage of fault. In a comparative fault system, each side's responsibility is measured as a share, and a person's own recovery is generally reduced by their own share.

Worked example 1: you are 70 percent at fault

Even a share of the claim, not the whole of it, passed the limit. The figures are illustrations; the arithmetic is the lesson.

Worked example 2: a fifty-fifty property claim

Suppose the other car is a $30,000 total loss and fault is split evenly. Your half is $15,000, which your minimum property damage limit covers exactly. Change the car to one worth $60,000 and your half becomes $30,000, of which the policy pays $15,000 and $15,000 is left with you. The share stayed the same; what you hit decided the outcome.

The other direction: your own losses

On a liability-only policy, the other driver's share of fault is your only route to money for your own car, because you have no collision coverage. If they are 30 percent at fault, a claim against them is generally for 30 percent of your losses, not all of them. That is the less-discussed exposure of liability-only: a split decision can leave most of your own damage unpaid.

When there are several at-fault drivers

Civil Code 1431.2 limits each defendant's share of non-economic damages to its percentage of fault. It says nothing that limits economic damages, such as medical bills and repair costs, in the same way. How that applies in a multi-car case is a question for an attorney, but it is one more reason not to assume your exposure is capped at your share.

Fault for claims versus fault for your rate

Pricing uses a separate test. Under the Insurance Commissioner's regulation, an insurer may not treat you as principally at fault unless your actions were at least 51 percent of the cause and the accident caused injury, death, or property damage over $1,000. A genuine fifty-fifty finding therefore does not make you principally at fault for rating.

Myth and fact

Myth: "If it was partly their fault, my limits don't matter."
Fact: Your share is measured against your limits like any other claim.

Myth: "Shared fault means each side pays for its own car."
Fact: Each side's claim against the other is reduced by its own share; that is not the same as each paying its own.

A split-fault crash is where both missing pieces of a minimum policy show at once. Price higher limits and collision together here and see what closing them would cost.