What Is a Sideswipe Collision, and Who Is at Fault in California?
Home / What Is a Sideswipe Collision, and Who Is at Fault in California?
This page was written and reviewed by Michael J. Cefali, Esq. Attorney Cefali is a founding partner of Cefali & Cefali, APC, based in San Juan Capistrano, CA. He holds a Juris Doctor from Chapman University Fowler School of Law and a B.A. in Global Studies & Maritime Affairs from the California Maritime Academy. Widely recognized for his advocacy in personal injury law, he has secured multi-hundred-thousand-dollar settlements in motorcycle accidents, hit-and-runs, and red-light collision cases. He maintains a perfect 10.0 “Superb” rating on Avvo.
Beyond his legal practice, Mr. Cefali actively supports his community through the Rotary Club of San Juan Capistrano, contributes to housing and meal programs for those in need, and enjoys fishing and spending time with his rescue dogs.
The date below reflects when this page was last reviewed for accuracy. Please see our Editorial Guidelines.
What Is a Sideswipe Collision, and Who Is at Fault in California?
A sideswipe collision happens when the sides of two vehicles traveling in the same or opposite directions make contact, usually when one vehicle drifts or merges into another's lane. In California, fault falls on whichever driver failed to stay in their lane or changed lanes unsafely, and because California uses pure comparative negligence, more than one driver can share the blame. If a sideswipe left you injured and you are not sure who was at fault, call (949) 325-7790 for a free consultation, available 24/7. No fee unless we win.
This guide explains what a sideswipe collision is, how fault is decided under California law, why these crashes are often disputed, and what to do if you were hurt in one.
What Is a Sideswipe Collision?
A sideswipe is a crash in which the sides of two vehicles come into contact while running roughly parallel to each other. Unlike a head-on or a T-bone (side-impact) crash, where the front of one car strikes another, a sideswipe involves the lengths of the vehicles scraping or slamming together. They most often happen when:
A driver changes lanes without checking a blind spot and hits a car already in that lane
Two drivers try to merge into the same lane at the same time
A distracted or drowsy driver drifts out of their lane
A driver drifts across the center line and sideswipes oncoming traffic
A vehicle merges onto a freeway without yielding to traffic already in the lane
Sideswipes are sometimes dismissed as minor, but they can be dangerous. A sideswipe at freeway speed can cause a driver to overcorrect, lose control, and trigger a rollover or a chain-reaction crash, and even a low-speed sideswipe can cause real injuries when it pushes a car into a barrier or another vehicle.
Who Is at Fault in a California Sideswipe Collision?
Fault in a sideswipe comes down to which driver had the right to be in the lane and which one broke a traffic rule. Under the California Vehicle Code, a driver must keep their vehicle within a single lane and may only leave it when it is reasonably safe to do so. A driver who is already established in a lane generally has the right of way over a driver trying to move into it. So fault usually rests with:
The driver who left their lane, by drifting, merging, or changing lanes into a vehicle that was already there
The merging driver, when two cars move toward the same lane, since the car already in the lane typically has the right of way
A distracted, impaired, or drowsy driver whose inattention caused the drift
The hard part is proof. Sideswipes frequently become "he said, she said" disputes, because each driver often claims the other one drifted. That is why physical evidence matters so much: the location and height of the paint transfer and scrape marks, the resting positions of the vehicles, dashcam or traffic-camera footage, and witness accounts can all show which car crossed the line.
What If We Were Both Partly at Fault?
Sideswipes are one of the most common crash types where both drivers share some blame, for example, when two cars drift toward the same lane at once. California handles this with pure comparative negligence, a rule established in the California Supreme Court case Li v. Yellow Cab Co. Under it, you can recover compensation even if you were partly at fault; your award is simply reduced by your percentage of fault.
For example, if your damages are $50,000 and you are found 30 percent at fault for drifting slightly, you can still recover $35,000. Unlike some states, California places no threshold that bars recovery, so even a driver found mostly at fault can recover something. This is why insurers work hard to pin as much fault as possible on you, and why an independent look at the evidence matters.
Common Sideswipe Injuries and Compensation
Because a sideswipe can send a vehicle out of control, injuries range from minor to severe, including whiplash and neck injuries, shoulder and arm injuries on the impact side, head injuries, broken bones, and injuries from a resulting rollover or secondary collision. A successful claim can recover medical expenses, lost wages and future earning capacity, vehicle damage, and pain and suffering. California does not cap general damages such as pain and suffering in an ordinary injury case.
You generally have two years from the date of the crash to file a personal injury lawsuit in California under Code of Civil Procedure section 335.1. For help reading the official crash report that often decides these fault disputes, see our guide on the CHP 555 traffic collision report.
What to Do After a Sideswipe Collision
Get medical attention, even if you feel fine, since neck and soft-tissue injuries can surface later.
Call the police so there is an official report documenting the crash and each driver's account.
Photograph everything, especially the paint transfer and scrape marks on both vehicles, which show which car crossed the line.
Get witness information and note any nearby traffic or business cameras.
Do not admit fault or accept an early insurance offer before speaking with an attorney.
Injured in a Sideswipe? Talk to a California Car Accident Lawyer
Because sideswipe fault is so often disputed, these cases turn on evidence and on countering the other driver's version of events. Cefali & Cefali investigates the physical evidence, gathers the footage and witness statements, and fights the insurer's attempt to shift blame onto you. Call (949) 325-7790 or contact us for a free consultation. No fee unless we win.
Frequently Asked Questions
Who is usually at fault in a sideswipe accident?
Usually the driver who left their lane, by drifting, merging, or changing lanes into a vehicle that was already there. Under the California Vehicle Code, drivers must stay within a single lane and only move when it is safe, and a car already established in a lane generally has the right of way over one trying to enter it. When two cars drift toward the same lane, both can share fault.
What if the other driver says I drifted into them?
Sideswipe fault is often disputed because each driver claims the other crossed the line. Physical evidence usually settles it: the height and direction of the paint transfer and scrape marks, the vehicles' resting positions, dashcam or traffic-camera footage, and witness statements. An attorney can gather and preserve this evidence before it disappears.
Can I still recover if I was partly at fault for the sideswipe?
Yes. California follows pure comparative negligence, so you can recover even if you were partly, or even mostly, at fault. Your compensation is reduced by your percentage of fault. If you are 30 percent at fault on a $50,000 claim, you can still recover $35,000. There is no cutoff that bars recovery based on your share of fault.
Are sideswipe accidents serious?
They can be. While some sideswipes cause only cosmetic damage, one at freeway speed can cause a driver to overcorrect and lose control, leading to a rollover or a chain-reaction crash. Even lower-speed sideswipes can cause whiplash, shoulder injuries, and neck injuries, which sometimes do not appear until days after the crash.
How long do I have to file a claim after a sideswipe in California?
Under California Code of Civil Procedure section 335.1, you generally have two years from the date of the crash to file a personal injury lawsuit. If a government vehicle or entity was involved, you may have as little as six months to file a claim. It is best to speak with an attorney early so evidence can be preserved while it is still available.
Michael Cefali is a dedicated accident attorney based in San Juan Capistrano, California, committed to securing justice and fair compensation for accident victims.
A graduate of Newport Harbor High School, he went on to earn his Bachelor’s degree in Global Studies and Maritime Affairs from the California Maritime Academy, followed by his Juris Doctor from Chapman University School of Law.
Deeply invested in his community, Michael is an active member of the Rotary Club of San Juan Capistrano, contributing to efforts that provide meals, housing, and support to those in need. Outside of his legal work and volunteer service, he enjoys fishing in Dana Point and spending time with his three rescue dogs—a Chihuahua, a Spaniel mix, and a Shepherd mix.
Driven by his strong belief in justice and fairness, Michael remains steadfast in advocating for individuals harmed by the negligence or inaction of others.
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