A right of way is conditional, not absolute
California traffic rules assign duties at signals, stop controls, and turning movements, but having the right of way does not authorize careless driving. A person permitted to proceed may still need to react reasonably to a hazard that becomes visible. The claim therefore considers both the governing traffic control and whether each road user used ordinary care under the circumstances.
A left-turning driver generally must yield to an approaching vehicle that is close enough to be a hazard and continue yielding until the turn can be made with reasonable safety. Once the driver has properly yielded and begun a lawful turn, the duties can change. This timing makes a left-turn collision more specific than a simple rule that the turning driver is always responsible.
Signal color and lawful entry are different questions
A steady red signal generally requires a stop at the limit line, crosswalk, or intersection as the statute specifies. California permits certain turns after stopping unless a sign prohibits them, but the turning driver must yield to pedestrians and vehicles that present an immediate hazard. A lawful turn on red can still be negligent if it is made without reasonable safety.
A driver who enters on a green indication may remain in the intersection while the signal changes. That later color does not necessarily show what the signal displayed at entry. Similarly, a traffic violation can be relevant without deciding causation by itself. The civil claim asks how the movement, timing, and attention of each person contributed to the impact.
The responsible party may not be limited to a driver
A vehicle owner may have statutory responsibility when a permissive driver causes injury. An employer may also be responsible if a driver was acting within the scope of work. If several road users contributed, California can allocate fault among them. The presence of a company vehicle or government employee does not by itself establish these relationships; the trip and legal status still matter.
A claim involving the intersection itself is different from a claim that a driver ignored a working control. Public-entity responsibility may require proof that public property was in a dangerous condition, that the condition created a foreseeable risk, and that the entity created it or had legally sufficient notice. A difficult or confusing intersection does not automatically satisfy those elements.
Public-property issues change the timeline
California generally provides two years for many personal injury lawsuits, subject to exceptions. When a city, county, state agency, or other public entity may be responsible, a claim generally must first be presented within six months. Design immunity and other statutory defenses may also apply even when the intersection design is challenged.
Insurance notice obligations can run separately, and negotiations with a driver's carrier do not necessarily preserve a public-entity claim. If the collision involves signal operation, roadway design, or a government vehicle, confirm early whether a public process applies. The correct deadline depends on the responsible party and legal theory, not merely on the date shown in a general injury rule.