Multi-vehicle pileups: how fault and insurance work

Chain-reaction crashes on freeways and in fog or heavy traffic can involve a handful of vehicles or dozens. They are harder to untangle than a two-car crash because injuries may come from more than one impact, and several drivers and insurers can each point at someone else.

Start with the sequence

The key question is usually which impact caused which injury. A person struck from behind and pushed into the car ahead may have been hurt in either collision, or both. The order of impacts, final resting positions, damage patterns and any dashcam or traffic-camera footage are how investigators reconstruct it. Because the collision report may describe the vehicles only in broad terms, your own photos of the vehicle positions and damage can matter.

Fault is split by percentage

California applies principles of comparative fault, so responsibility is expressed as a percentage of fault rather than all or nothing. Where several defendants share fault:

• Economic damages, such as medical expenses and lost income, remain subject to joint liability and may be recovered in full from any defendant found liable (Civil Code 1431).
• Non-economic damages, such as pain and suffering, are divided according to each defendant's percentage of fault (Civil Code 1431.2).

A driver pushed into another car by an impact from behind is not automatically blameless or at fault; the question is whether that driver had enough space and attention before being struck (see Vehicle Code 21703, following too closely).

Insurance can run short

With many injured people and several policies, available coverage may not cover everyone's losses. Practical points:

• Identify every at-fault driver, and any employer who may be responsible for a driver who was on the job (Civil Code 2338).
• Your own underinsured motorist coverage may add a source of recovery when the at-fault vehicles are insured for less than your own uninsured motorist limits. It generally does not apply until the liability limits of all the insured vehicles that caused the injury have been paid out, and it is reduced by what those parties paid (Insurance Code 11580.2).
• If one defendant settles, California lets the court decide whether the settlement was made in good faith; a good-faith determination bars the other defendants from further claims against the settling defendant for contribution or indemnity (Code of Civil Procedure 877.6). Settling early with one insurer can have consequences for the rest of the claim, so understand a release before signing it.

What to gather

• A photo of every vehicle and its damage, and the position of vehicles relative to lane markings, if you can safely do so.
• Names, plates and insurers for as many drivers as possible. In a large pileup, the collision report may list them, so get the report number.
• Witness contacts, especially from drivers who stopped without being hit.
• Records showing which symptoms you reported, and when, so injuries can be matched to impacts.

Deadlines

The general two-year deadline for injury suits applies (Code of Civil Procedure 335.1), and a shorter government-claim deadline, generally six months, applies if a public agency may share responsibility, such as for a road defect (Government Code 911.2).