In most rear-end accidents in Walnut Creek and throughout California, the driver who struck the vehicle in front is presumed to be at fault. This is because California law requires drivers to maintain a safe following distance, and rear-end collisions typically happen when that distance is not maintained. However, this presumption is not absolute. In non-rear-end accidents, such as those involving intersections, left turns, or lane changes, fault is rarely obvious and usually depends on a closer look at the specific facts, traffic laws, and available evidence. Understanding how these two types of accidents are evaluated differently can help you know what to expect after a crash.

Why Rear-End Accidents Are Different Under California Law

California Vehicle Code Section 21703 requires drivers to maintain a following distance that is reasonable and prudent given the speed of traffic and road conditions. When a driver rear-ends another vehicle, this statute generally supports a presumption that the rear driver was following too closely and therefore acted negligently. Insurance adjusters, police officers, and courts commonly rely on this presumption as a starting point when sorting out liability after a rear-end crash.

This presumption exists because a driver who is paying attention and keeping a safe distance should normally be able to stop or slow down in time to avoid hitting the car ahead, even if that car brakes unexpectedly.

How the Presumption of Fault Can Be Challenged

The presumption that the rear driver is at fault is not automatic in every case. It can be challenged with evidence showing that the front driver’s own conduct contributed to or caused the crash. Common situations where the rear driver may not bear full responsibility include:

• The front driver made a sudden, unsafe stop without justification, sometimes called brake checking.
• The front driver’s brake lights or turn signals were not working.
• A mechanical failure, such as brake malfunction, contributed to the collision.
• The crash was part of a multi-vehicle, chain reaction pileup where an earlier impact pushed one car into another.
• The front vehicle reversed unexpectedly or was stopped illegally in a travel lane.

When these circumstances apply, fault may be shared between both drivers, or in some cases shift primarily to the front driver.

How Fault Works in Non-Rear-End Accidents

Non-rear-end accidents, such as those at intersections, during left turns, or while changing lanes, do not come with the same built-in presumption. Fault in these cases depends on which driver violated a specific traffic law or duty of care. A few common examples include:

• Left-turn accidents. Under California Vehicle Code Section 21801, a driver turning left or making a U-turn must yield to oncoming traffic close enough to pose a hazard. A left-turning driver who pulls into an intersection too soon is often found at fault, though an oncoming driver who was speeding or ran a red light may share responsibility.
• Lane change accidents. California Vehicle Code Section 22107 requires drivers to signal and move only when it is safe to do so. A driver who merges without checking blind spots or signaling can be found liable for a resulting collision.
• Intersection accidents. Fault often turns on which driver had the right of way, whether a traffic signal or stop sign was obeyed, and witness or camera evidence showing how the collision occurred.

Because these cases usually involve conflicting accounts of who had the right of way, they typically require a more detailed investigation than a rear-end collision.

California’s Comparative Negligence Rule

California follows a pure comparative negligence rule, established by the California Supreme Court in Li v. Yellow Cab Co., 13 Cal. 3d 804 (1975). Under this rule, more than one driver can share fault for an accident, and each driver’s compensation is reduced by their own percentage of responsibility rather than being barred entirely.

For example, if a jury or insurance adjuster determines that the rear driver in a rear-end crash was 80 percent at fault and the front driver was 20 percent at fault for stopping unsafely, the front driver could still recover 80 percent of their damages. This rule applies whether the accident was a rear-end collision or occurred in an intersection, during a lane change, or in any other setting.

Evidence That Helps Prove Fault

Because California allows fault to be divided between drivers, strong evidence can make a significant difference in how a claim is resolved. Useful evidence after a car accident in Walnut Creek can include:

1. The official police or traffic collision report.
2. Photographs of vehicle damage, skid marks, and the accident scene.
3. Statements from witnesses who saw the collision occur.
4. Dashcam or nearby surveillance footage.
5. Event data recorder, or black box, information showing speed and braking.
6. Cell phone records if distracted driving is suspected.

Gathering and preserving this evidence quickly is often important, since surveillance footage may be deleted and witness memories can fade over time.

Deadline to File a Car Accident Claim in California

Under California Code of Civil Procedure Section 335.1, most car accident injury claims must be filed within two years from the date of the crash. If the claim involves a government vehicle or public entity, such as a city bus or municipal vehicle, a separate and much shorter notice deadline, generally six months, applies before a lawsuit can be filed. Missing these deadlines can permanently bar you from recovering compensation, so it is important to act promptly after any accident.

Talk to a Walnut Creek Car Accident Lawyer

Whether you were rear-ended on a Walnut Creek roadway or involved in a more complicated intersection or lane change accident, determining fault accurately is essential to recovering fair compensation for your injuries and losses.

The Fetto Law Group has more than 38 years of experience representing car accident victims throughout Walnut Creek and the East Bay. If you were injured in a rear-end or non-rear-end collision, call (510) 804-2272 for a free consultation to discuss how fault applies to your case.

Disclaimer: This article is for informational purposes only and does not constitute legal advice. For legal guidance tailored to your specific situation, consult a licensed attorney.