A Speeding Driver Caused Your Crash. California's negligence per se doctrine makes speed violations legally powerful.

Speeding Liability Under California Law

California's basic speed law — Vehicle Code § 22350 — prohibits driving faster than is reasonable and prudent for existing conditions. Violation of this statute, or of any posted speed limit, supports a negligence per se claim when the violation caused the accident.

California Vehicle Code § 22350 establishes that no person shall drive a vehicle at a speed greater than is reasonable or prudent given the weather, visibility, traffic, and road surface conditions — and in no event at a speed that endangers safety. This standard applies independently of posted speed limits. A driver traveling at the posted limit may still violate § 22350 if conditions (fog, rain, ice, heavy traffic) made that speed unreasonably dangerous.

California Evidence Code § 669 codifies negligence per se: when a person violates a statute designed to protect a class of persons (here, other road users) and that violation proximately causes the type of harm the statute was designed to prevent (traffic injury), negligence is presumed. Speed limit violations trigger this presumption directly.

Speed-related crashes account for approximately 29% of California's traffic fatalities annually (NHTSA FARS data). High-speed crashes produce disproportionately severe injuries — the force of impact increases geometrically with speed. This means speed cases often involve substantial medical damages, long recovery periods, and permanent injury — factors that significantly affect the damages calculation.

What to Do After a Speeding Accident in California

Steps that preserve the speed-specific evidence — EDR data, radar readings, and reconstruction evidence — that is critical to establishing liability in speeding cases.

1
Call 911 and report the estimated speed. Tell the responding officer your estimate of the other vehicle's speed before impact. Officers may access nearby speed enforcement radar data, LIDAR, or traffic monitoring systems. A speed citation in the report is powerful civil evidence.
2
Photograph skid marks before they fade. Pre-impact skid marks (if any) and post-impact tire marks are critical inputs for accident reconstruction. Photograph them immediately — they fade rapidly with traffic and weather. Include a reference object (coin, pen) for scale.
3
Seek medical attention promptly. High-speed crashes cause disproportionately severe injuries. Emergency documentation of all injuries establishes causation and the full extent of harm.
4
Note witness accounts of the other vehicle's speed. Bystanders who saw the vehicle approaching before the crash can provide lay estimates of speed that supplement reconstruction evidence. Collect names and contact information.
5
Send an EDR preservation demand promptly. Event Data Recorders in modern vehicles capture speed, braking, and throttle position in the seconds before impact. If the other vehicle is totaled, the EDR data may be destroyed unless a written preservation demand is sent to the vehicle owner and insurer immediately after the accident.
6
Preserve all evidence and records. Save all medical records, bills, pay stubs, and insurer correspondence. Do not post about the accident online.

Your Rights After a Speeding Accident in California

Right to the Benefit of Negligence Per Se

If the other driver violated California Vehicle Code § 22350 or a posted speed limit, Evidence Code § 669 entitles you to argue that negligence is presumed as a matter of law — you do not have to separately establish that the driver's conduct fell below a reasonable standard. This shifts the focus of the case to causation and damages.

Right to Full Compensatory Damages

You are entitled to recover all economic damages (past and future medical expenses, lost wages, diminished earning capacity, property damage) and non-economic damages (pain and suffering, emotional distress, loss of enjoyment of life). California imposes no cap on compensatory damages in automobile accident cases.

Right to Pursue a Claim Despite Comparative Fault

California's pure comparative fault system allows recovery even if you were partially at fault for the accident. Your recovery is reduced proportionally by your percentage of fault — but you may recover even if you are found substantially at fault. An insurer that denies all recovery based on minor plaintiff fault is not applying California law correctly.

Proving Fault in Speeding Accident Cases

Speed cases typically involve two liability arguments: (1) negligence per se (statutory speed violation) and (2) general negligence (unreasonable speed for conditions under § 22350). The first applies when the driver exceeded a posted limit. The second applies even when speed was within posted limits but was unreasonable for existing conditions.

Event Data Recorder (EDR/black box) data is the most reliable speed evidence. Modern vehicles record speed, braking application, and throttle position in the five to ten seconds before impact. This data is extracted by certified professionals using specialized tools. EDR data has been admitted in California civil proceedings and carries significant evidentiary weight.

Accident reconstruction using crush damage analysis, coefficient of friction, and skid mark measurements provides an independent speed estimate. When EDR data and reconstruction align, the resulting speed evidence is typically difficult to contest. In cases where EDR data is unavailable, reconstruction may be the primary speed evidence.

Insurance in Speeding Accident Cases

Speeding accident claims proceed against the at-fault driver's liability insurer. California's minimum liability limits ($30,000 per person effective 2025) are often inadequate for serious injuries sustained in high-speed crashes. If the at-fault driver's limits are exhausted, your underinsured motorist (UIM) coverage (Insurance Code § 11580.2) may provide additional recovery.

Insurers in speeding cases routinely dispute both the speed evidence and comparative fault — attempting to attribute contributory negligence to the injured party to reduce the settlement value. Understanding the EDR and reconstruction evidence in your case is important before engaging in settlement negotiations.

Evidence That Matters in Speeding Accident Cases

Most critical evidence in speeding cases: Event Data Recorder (EDR/black box) data, police report speed notation or citation, accident reconstruction analysis, skid mark and crush damage documentation, witness speed estimates, dashcam or traffic camera footage, and the posted speed limit at the accident location (document with photographs at scene).

In cases involving large speed differentials (20+ mph over posted limits), the crush damage alone may suggest excessive speed to a reconstruction expert. High-quality photographs of both vehicles' damage — taken from multiple angles before vehicles are moved — are essential reconstruction inputs. Insurance companies' total-loss processing often destroys vehicles before EDR data is preserved; send a preservation demand immediately after the accident.