Fault After a Lane Change to Avoid a Speeder

Attorney Answer

The other driver can present a claim to your insurer and, if that does not resolve it, sue you — and the reason you moved over may reduce your share of the blame without erasing it. California does not pick a single villain in a crash; it divides responsibility.

The rule that governs the movement itself is Cal. Veh. Code § 22107: "No person shall turn a vehicle from a direct course or move right or left upon a roadway until such movement can be made with reasonable safety and then only after the giving of an appropriate signal in the manner provided in this chapter in the event any other vehicle may be affected by the movement." A lane change made because of a car closing fast behind you is still measured by that standard — whether the movement could be made with reasonable safety, and whether it was signaled.

Liability then runs through Cal. Civ. Code § 1714(a): "Everyone is responsible, not only for the result of his or her willful acts, but also for an injury occasioned to another by his or her want of ordinary care or skill in the management of his or her property or person, except so far as the latter has, willfully or by want of ordinary care, brought the injury upon himself or herself." California is a pure comparative fault state, and as the Supreme Court applied that section in Daly v. General Motors Corp., 20 Cal. 3d 725 (1978), responsibility is assigned in proportion to each party's share rather than in a single lump. The speeding driver behind you may carry a share too, if that driver can be identified and the facts support it. California also recognizes that a driver reacting to a genuine emergency not of their own making is judged by what was reasonable in that moment — how far that argument carries on your facts is a question for a local attorney, and it is an argument about percentage, not a defense that ends the claim.

There is also the ceiling to think about. For accidents before January 1, 2025, the minimum liability limits under Cal. Veh. Code § 16056(a) were $15,000 per person, $30,000 per accident and $5,000 for property damage; for accidents on or after that date they are $30,000, $60,000 and $15,000. If the other driver's damages run past your limits, the difference is your personal exposure. If a judgment were ever entered, California protects some property from collection — Cal. Code Civ. Proc. § 704.010 exempts $7,500 in vehicle equity, and Cal. Code Civ. Proc. § 704.730 sets a homestead exemption of at least $300,000, up to a $600,000 ceiling based on the countywide median home price, adjusted for inflation each year.

What you can do

1. Report the collision to your own insurer now if you have not, and give it the details it asks for. Your policy obliges you to cooperate, and late notice is a problem you do not need.

2. Send any letter, call or form from the other driver or their insurer to your own insurer, and let your insurer handle the discussion of fault.

3. Preserve what already exists: photographs, dashcam footage, the information exchanged at the scene, and the contact details of anyone who saw it.

4. Tell your insurer immediately if the other driver reports an injury rather than just vehicle damage — that changes which limit applies and how the claim is handled.

5. Ask a local attorney if the claim looks like it may exceed your policy limits, or if you are served with court papers; forward anything you are served to your insurer the same day.

Most lawyers offer a brief initial call at no cost, and a few minutes on your specific facts is worth more than any general guidance, including this page.

⏱ Time limits apply. The other driver's claim for damage to the vehicle runs on Cal. Code Civ. Proc. § 338(c)(1)'s three years, and any injury claim on Cal. Code Civ. Proc. § 335.1's two years. When each period started, and what it means for you, depends on the facts — a local attorney can tell you where you stand, and it is worth asking before an insurer's file closes rather than after.