CVC 22107 Explained: Who’s at Fault in an Unsafe Lane Change Accident in California?

Article Summary

California Vehicle Code 22107 (CVC 22107) requires two things of every driver before changing lanes or turning from a direct course: the movement must be made with reasonable safety, and the driver must signal whenever another vehicle may be affected. A driver who violates CVC 22107 and causes a collision is presumed negligent under California law, and unsafe lane changes are a leading cause of sideswipe crashes, freeway merge collisions, and motorcycle accidents. A CVC 22107 citation is an infraction carrying a total fine of roughly $238 and one DMV point — but in an injury case, the same violation becomes powerful evidence of fault. Victims injured by an unsafe lane change in Los Angeles or anywhere in California may recover compensation for medical bills, lost wages, pain and suffering, and other damages. Attorney Steven M. Sweat has represented injured Californians for over 30 years and offers free consultations at 866-966-5240.

Every Los Angeles driver has seen it — the car that darts across two lanes of the 405 without a blinker, the merge that forces you onto the shoulder, the pickup that drifts into the space your motorcycle was occupying. California has a specific statute for exactly this conduct, and when it causes a crash, that statute frequently decides who pays.

This article explains what CVC 22107 requires, how the 100-foot signal rule works, what a violation costs as a ticket, and — most importantly — how a CVC 22107 violation establishes fault in a California personal injury claim.

What CVC 22107 Actually Says

California Vehicle Code section 22107 provides: “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.”

That single sentence imposes two separate duties, and a driver must satisfy both:

• The safety duty. The lane change or turning movement may only be made when it can be completed “with reasonable safety.” That means checking mirrors and blind spots, accounting for the speed of surrounding traffic, and not forcing another driver to brake or swerve. Signaling does not cure an unsafe movement — a blinker is not a force field.
• The signal duty. Whenever any other vehicle may be affected, the driver must give an appropriate signal. The companion statute, CVC 22108, requires that signal to be given continuously during the last 100 feet before the movement. At freeway speeds, 100 feet passes in roughly one second — a blinker flicked on mid-merge does not satisfy the law.

The statute applies to every lane change and every turning movement from a direct course, on freeways and surface streets alike — merging onto the 10, changing lanes on Olympic Boulevard, or drifting across a lane line while distracted.

What a CVC 22107 Ticket Costs

As a traffic citation, a CVC 22107 violation is an infraction. The statutory base fine is modest, but California’s penalty assessments multiply it — the total is typically around $238 and can exceed $400 with court fees. A conviction adds one point to the driver’s DMV record for three years, and eligible drivers can attend traffic school to mask the point. Repeat points risk a negligent-operator license suspension.

But the ticket is the small consequence. The large one arrives when the unsafe lane change causes a collision — because the same violation that costs $238 in traffic court can establish liability for every dollar of harm in civil court.

The Crashes CVC 22107 Violations Cause

• Sideswipe collisions. The classic unsafe lane change: a driver moves into an occupied lane and strikes the vehicle beside them. On multi-lane freeways, the impact frequently deflects one or both vehicles into other lanes, turning a lane-change error into a multi-car crash.
• Merge and cut-off crashes. A driver forces into a gap that does not exist, and the following driver either strikes them or brakes hard and is rear-ended. Even when the physical impact is rear-end, the lane-changing driver’s CVC 22107 violation can carry most or all of the fault. For a full discussion of rear end collision liability, read our blog on CVC 21703 – Tailgating Liability.
• Motorcycle blind-spot collisions. Unsafe lane changes are among the most dangerous crash types for riders — a motorcyclist legally occupying a lane is struck by a driver who never checked the blind spot. As we explain in our analysis of who is at fault in most California motorcycle accidents, the great majority of multi-vehicle motorcycle crashes are caused by the other motorist — and lane-change violations are a recurring reason.
• Run-off and evasive-maneuver crashes. A driver who swerves or leaves the roadway to avoid an unsafe lane change can recover against the lane-changing driver even without contact — these “no-contact” or phantom-vehicle cases are provable with witness testimony and camera footage.

How a CVC 22107 Violation Establishes Fault

In a California injury case, violation of a safety statute like CVC 22107 supports negligence per se — a presumption that the violating driver was negligent, which arises when the violation causes the kind of harm the statute was designed to prevent, to a person the statute was designed to protect. A driver who changed lanes into occupied space, or without signaling, fits squarely within that framework: the entire purpose of CVC 22107 is preventing collisions with the vehicles affected by the movement.

California follows a pure comparative fault system under Li v. Yellow Cab Co. (1975) 13 Cal.3d 804, meaning fault can be divided among multiple parties and an injured person can recover even if partially at fault, with damages reduced by their percentage of responsibility. In practice, the driver who made the unsafe lane change is typically assigned the majority of fault — often all of it. Insurers defending these cases predictably argue the other vehicle was speeding or “in the blind spot,” but a blind spot is not a legal excuse: the duty to verify the lane is clear belongs to the driver making the movement. For a full explanation of how shared fault affects your recovery, see our guide to California comparative fault law.

When police respond to a lane-change collision, a CVC 22107 notation on the traffic collision report is powerful evidence — it documents that the officer found circumstances consistent with a violation, supports the negligence presumption, and carries real weight with insurance adjusters evaluating liability. The same is true of the related right-of-way statutes we cover in our guide to CVC 21801 and left-turn fault.

Proving an Unsafe Lane Change

Lane-change cases often begin as word-against-word disputes — each driver claims the other drifted. The evidence that resolves them:

• Dash cam and surveillance footage. The single most decisive evidence — a camera settles the signal question and the lane-position question in seconds. Nearby businesses, transit cameras, and other drivers’ dash cams should be canvassed immediately before footage is overwritten.
• Vehicle damage patterns. Sideswipe damage geometry — the angle, height, and direction of scrapes and transfers — tells a reconstructionist which vehicle moved into which.
• Event data recorder (EDR) downloads. Steering input, speed, and braking data from both vehicles’ EDRs can show which driver initiated the lateral movement.
• Witness statements. Independent witnesses — especially following drivers with a clear sightline — frequently decide disputed lane-change liability.

One more rule protects everything above: be careful what you say. The other driver’s insurer will call quickly, and lane-change cases are exactly where a stray “I never saw them” gets weaponized. Review our guide on what not to say to an insurance adjuster after a California car accident before giving any statement.

Frequently Asked Questions About CVC 22107

What is CVC 22107?

CVC 22107 is the California Vehicle Code section governing unsafe lane changes and turning movements. It prohibits moving right or left on a roadway unless the movement can be made with reasonable safety, and requires an appropriate signal whenever another vehicle may be affected.

Is the driver who changed lanes always at fault in a sideswipe accident?

Not automatically, but a CVC 22107 violation creates a strong presumption of negligence against the lane-changing driver, and that driver is typically assigned the majority of fault — often all of it. California’s pure comparative fault rules allow adjustment based on the specific facts, such as the other vehicle’s speed.

What is the fine for a CVC 22107 ticket?

The total is typically around $238 including penalty assessments, and additional court fees can push it past $400. The conviction adds one point to the driver’s DMV record; eligible drivers can attend traffic school to keep the point off their public record.

What is the difference between CVC 22107 and CVC 22108?

CVC 22107 contains the substantive duties — reasonable safety and an appropriate signal. CVC 22108 specifies the signal timing: continuously during the last 100 feet traveled before turning or changing lanes. In practice, officers and attorneys cite the two together: 22107 for the unsafe movement, 22108 for the inadequate signal.

The other driver says I was in their blind spot. Does that matter?

No. A blind spot is not a legal defense — CVC 22107 places the burden on the driver making the movement to verify the lane is clear before moving, which includes checking mirrors and physically checking blind spots. “I didn’t see them” is an admission that the driver moved without confirming the movement was safe.

What if we both changed lanes into the same lane at the same time?

Dual-merge collisions — both vehicles converging on the same center lane — are genuine comparative fault cases. Liability turns on the evidence: who signaled, who began the movement first, relative speeds, and damage geometry. Both drivers owed the CVC 22107 duties, and fault is apportioned between them based on the facts.

How long do I have to file a lawsuit after an unsafe lane change accident?

Generally two years from the date of the accident for injury claims under California Code of Civil Procedure § 335.1, and three years for property damage only. Claims against government entities require an administrative claim within six months under Government Code § 911.2. Evidence in lane-change cases — camera footage especially — disappears far faster than any legal deadline, so act quickly regardless.

Injured by an Unsafe Lane Change? Talk to Us Free

For over 30 years, Steven M. Sweat, Personal Injury Lawyers, APC has represented Californians injured by negligent drivers — including hundreds of lane-change, merge, and sideswipe collisions on Southern California’s freeways and surface streets. We know how to prove these cases and how to defeat the blind-spot excuse. Consultations are free and confidential, we handle every case on a contingency fee with nothing owed unless we win, and services are available in English and Spanish. Call 866-966-5240, 24 hours a day, 7 days a week.