Who Is at Fault in a Sideswipe Car Accident?
Sideswipe collisions happen in an instant, such as a drift out of a lane, a missed blind spot, a bad merge, and they often leave both drivers pointing fingers. Determining fault is rarely as simple as it looks. Here is how responsibility is decided in Utah and what it means for your recovery.
Fault in a sideswipe usually falls on the driver who left their lane or failed to yield when changing lanes or merging. But Utah uses a modified comparative fault system, so responsibility can be split between drivers. As long as you are less than 50% at fault, you can still recover, reduced by your share of the blame.
What is a sideswipe collision?
A sideswipe happens when the sides of two vehicles traveling in the same or opposite directions make contact. Unlike a head-on or rear-end crash, the point of impact runs along the length of the vehicles. These crashes commonly occur during lane changes, merges, and moments of distraction, and they can push a driver into another lane, a barrier, or oncoming traffic, turning a minor scrape into a serious wreck.
- Unsafe lane changes. A driver moves over without checking a blind spot or signaling.
- Merging errors. A driver entering a highway fails to yield to traffic already in the lane.
- Drifting. Distraction, drowsiness, or impairment causes a driver to wander out of their lane.
- Dual lane changes. Two drivers move toward the same lane at once, each assuming the space is theirs.
How fault is typically assigned
The core question is which driver had the right to occupy the lane and who failed to use reasonable care. A driver already traveling in a lane generally has the right of way over one entering it. The table below shows how fault commonly shakes out, though every case turns on its specific facts and evidence.
| Scenario | Usually at fault | Why |
|---|---|---|
| One driver changes lanes into another | The driver changing lanes | They must yield to traffic already in the lane |
| A merging driver hits highway traffic | The merging driver | They must yield when entering the flow of traffic |
| Both drivers change into the same lane | Often shared | Both failed to confirm the lane was clear |
| A drifting driver crosses the line | The drifting driver | They failed to maintain their lane |
Key point. Because a sideswipe can be blamed on either driver, insurers often try to shift responsibility onto you to cut what they pay. Evidence, not the other driver’s story, should decide fault, which is why documenting the scene matters so much.
Utah’s comparative fault rule
Utah does not require one driver to be entirely to blame. Under the state’s modified comparative fault system, each driver can be assigned a percentage of responsibility, and your compensation is reduced by your share. If you are found 20% at fault, for example, you can still recover 80% of your damages.
There is an important limit: if you are found to be 50% or more at fault, equally or more responsible than everyone else combined, you cannot recover from the other driver at all. That threshold is exactly why insurers fight to push your percentage up, and why building a strong evidence-based case is so important in a sideswipe dispute.
What to do after a sideswipe crash
Get to safety and check for injuries
Move out of traffic if you can, call 911, and get medical attention for anyone hurt. Your safety comes before anything else.
Call the police and get a report
An official report creates a neutral record of the scene and statements, which can be crucial when fault is disputed.
Document everything
Photograph both vehicles, the damage along the sides, the lane markings, and the road. Gather witness names and contact information.
Be careful what you say, then call an attorney
Do not admit fault at the scene or to an adjuster. Let a Utah car accident attorney review the evidence before you give a recorded statement.