Intersection Accident in California: Right-of-Way Law, Signal Evidence, and Your Legal Rights.

Intersection Accident Law in California: Right-of-Way and Signal Evidence

Intersection accidents — T-bone collisions, angle impacts, and left-turn crashes — frequently involve disputed right-of-way questions where both drivers claim they had the green light or the right of way. Traffic signal event logs resolve these disputes with objective, timestamped evidence that cannot be argued around.

California Vehicle Code §§ 21800 through 21804 establish right-of-way rules for California's intersections. § 21800 governs uncontrolled intersections (the vehicle on the left yields to the vehicle on the right when both arrive simultaneously). § 21801 governs left-turn movements (the left-turning driver yields to oncoming traffic with the right of way). § 21802 governs stop signs (vehicles must stop and yield before entering). § 21453 governs traffic signals (entering against a red signal is a Vehicle Code violation). Violations of these statutes constitute negligence per se in civil proceedings.

Traffic signal management systems in California's major cities — operated by city DOT departments including LADOT, SFMTA, San Diego DOT, and others — maintain electronic event logs recording each signal phase change, timing interval, and malfunction event for every controlled intersection. These logs establish the objective signal phase at the precise moment of a crash — directly resolving the most commonly disputed question in intersection accident cases without relying on either driver's self-interested account. Public Records Act requests to the relevant city DOT must be sent within 24–72 hours before the standard overwrite cycle resets.

What to Do After an Intersection Accident in California

Steps to preserve traffic signal evidence and protect your legal rights after an intersection accident in California.

1

Call 911 — do not move vehicles until law enforcement arrives

The post-crash vehicle positions at an intersection establish the direction of travel and point of impact — essential for right-of-way analysis. Do not move vehicles until they have been documented by responding officers.

2

Photograph the intersection comprehensively

Document all vehicles, damage patterns, signal hardware, lane markings, crosswalks, and the intersection geometry from multiple angles. If the intersection involves a rail crossing, photograph the crossing signal equipment.

3

Identify all traffic cameras — request signal log preservation within 24 hours

City DOT traffic cameras, adjacent business cameras, and transit vehicle cameras are all potential evidence sources. Signal event logs must be requested from the city DOT's traffic engineering division within 24 hours — standard retention is 24–72 hours before overwrite.

4

Collect all witness contact information independently

Intersection accidents frequently have bystander witnesses. Collect contact information independently from the police report — do not rely solely on the responding officer to capture all witnesses present.

5

Seek same-day medical evaluation

T-bone and angle intersection collisions frequently produce significant lateral and rotational forces — injuries to the head, neck, and thorax are common and should be evaluated immediately.

6

Identify government vehicle involvement before any other legal action

If any vehicle involved was a government entity vehicle (city, county, state, or transit authority), the six-month Government Claims Act deadline under Government Code § 911.2 begins on the accident date. This identification is the most time-sensitive threshold legal question after any California intersection accident.

Your Rights After an Intersection Accident in California

The Right to Traffic Signal Event Log Data

Traffic signal event logs maintained by city DOT traffic engineering divisions are public records obtainable under the California Public Records Act. These logs document the exact signal phase at the moment of the crash with objective, timestamped data. An attorney can send a formal preservation request and Public Records Act request to the relevant city DOT on the same day as the accident — within the 24-hour window that maximizes the probability of footage preservation before overwrite.

The Right to Pursue Government Liability for Signal Malfunction

When a defective or malfunctioning traffic signal contributed to an intersection crash, the city or government entity responsible for maintaining that signal may bear liability under the Government Tort Claims Act. Prior malfunction reports in the city's maintenance records strengthen the government liability claim significantly. Government entity signal malfunction claims require the written government tort claim within six months under Government Code § 911.2 — a prerequisite to any lawsuit against the government defendant.

The Right to Negligence Per Se for Signal Violations

A driver who entered an intersection against a red signal in violation of CVC § 21453 is negligent per se in the civil case — the traffic violation conclusively establishes breach of the duty of care. Combined with objective signal event log evidence documenting the red-signal phase, this creates a powerful fault foundation that is difficult for the at-fault driver's insurer to contest.

How Fault Is Determined in Intersection Accident Cases

Intersection accident fault is determined by applying California's right-of-way statutes (CVC §§ 21800–21804, 21453) to the facts established by objective evidence. The most common dispute is whether a particular driver had the green light at the moment they entered the intersection — a factual question where the testimony of the opposing drivers is inherently in conflict and an objective evidence source is essential.

Traffic signal event logs resolve this dispute by documenting the exact signal phase change sequence in the seconds surrounding the crash. When combined with the collision report's documented crash time and the responding officer's investigation, signal event log data typically resolves the primary fault question without requiring a trial. Under California's pure comparative negligence system, any remaining fault allocation — for example, whether either driver was also speeding through the intersection — reduces but does not eliminate the injured party's recovery.

Insurance Considerations in Intersection Accident Claims

Standard California auto liability insurance applies to intersection accidents in the same framework as other vehicle accidents — the at-fault driver's liability insurer pays damages up to policy limits; UIM coverage supplements when damages exceed the at-fault driver's limits; and government entity signal malfunction claims proceed through the Government Claims Act process against the responsible city or agency. When the intersection accident involved a transit vehicle (Muni, RT, MTS, VTA), the transit authority's self-insurance or liability coverage applies and the Government Claims Act six-month deadline governs the claim process against that entity.

Evidence That Matters in Intersection Accident Cases

The most critical evidence in intersection accident cases and their respective time windows: traffic signal event logs (24-hour Public Records Act preservation request — before the overwrite cycle resets); city DOT traffic camera footage (24–72 hours); adjacent business camera footage (24–72 hours, owner letter required); transit vehicle exterior camera footage if a transit vehicle was present (immediate request to transit authority); police report (5–10 business days from the agency); witness statements (collected at the scene); and medical records establishing injury and causation from same-day evaluation through maximum medical improvement. The 24-hour camera and signal log preservation window is the most time-sensitive element of an intersection accident investigation.