Left-Turn Accident Fault: Signals, Evidence and Shared Responsibility

A left-turn fault review starts with the drivers’ roles, the signal, and the applicable yielding rule. The direction of the turn does not supply a fault percentage. Record what is known, identify what remains disputed, and keep those questions separate from the amount of any claimed damages.

This guide uses California and New York as specific state examples. It is educational information, not legal advice or a review of every jurisdiction.

What the yielding rules say

Under California Vehicle Code section 21801(a), a left-turning driver must wait for opposing vehicles that would present a hazard during the turn until the maneuver can be made with reasonable safety. Subsection (b) also matters: after the driver has yielded as required and properly signaled, opposing drivers approaching the intersection or property entrance must yield to the turning vehicle. Read both parts before applying a shorthand rule about who had priority.

New York Vehicle and Traffic Law section 1141 requires a left-turning driver to yield to opposing traffic already in the intersection or close enough to present an immediate hazard. These examples identify duties to investigate; they do not establish who breached a duty in your crash.

A green arrow still requires care

California Vehicle Code section 21451(b) allows the indicated movement and other movements permitted by simultaneous signals. It also requires yielding to traffic and pedestrians lawfully within the intersection or an adjacent crosswalk. A green arrow is therefore relevant evidence, but it does not answer every question about a collision.

Identify the signal that controlled each vehicle’s lane. Keep a driver’s recollection of a green light separate from proof that it was a protected arrow. A signal-program document can describe intended phases; it does not necessarily establish the phase at the moment of the crash or whether the equipment operated as intended.

Build an evidence record

Start with who was turning, who was proceeding in another direction, and what each person actually saw. Describe observations separately from estimates of speed, distance or timing. A traffic citation or damage location does not by itself establish a numerical allocation.

The police report guide can help you organize the report alongside the rest of the file.

Practical documentation steps

1. Put safety first. Seek emergency help when needed and do not enter moving traffic to collect evidence.
2. Record the date, time, location, vehicle roles, lane markings and signals from a safe position. Note uncertainty instead of filling gaps with guesses.
3. Keep original photos, video and documents unchanged. Make separate annotated copies if you need to explain a detail.
4. Save witness contact information and record who supplied each account. Do not present someone else’s account as your own observation.
5. Ask promptly about relevant reports, signal records or footage. Access and retention vary; a request does not establish that a record exists or will be released. Do not access another person’s accounts or equipment without permission.

Use the personal injury evidence checklist to organize the broader claim file. A qualified local attorney can assess the applicable duties and unresolved evidence when liability is disputed.

Compare assumed percentages without treating them as findings

For a hypothetical arithmetic example, assume $100,000 in damages and a 25% claimant fault share. A proportional reduction gives $100,000 × 75% = $75,000. This is an illustration before coverage limits, applicable legal exceptions, fees, costs and liens. It is not a settlement estimate for a left-turn crash.

The fault percentage estimator lets you enter an assumed share from 0 to 100 and compare four simplified rules. The starting 25% is an example. The optional fixed-point mode preserves a teaching illustration with disclosed weights that are not derived from case outcomes. Neither mode determines actual fault, chooses the controlling law or predicts payment. The Spanish calculator uses the same arithmetic.

Try several assumptions to understand how sensitive the arithmetic is to a disputed allocation. Keep those scenarios labeled as assumptions; evidence does not become a particular percentage merely because it changes a calculator input.

Source scope

The three official statute pages linked above were checked on September 12, 2026. They cover selected California and New York duties, not all states, legal exceptions or claims. Verify the law applicable to the location and circumstances of the collision before relying on a general description.