Who's at Fault in a Left-Turn Accident?

Left-turn crashes at intersections are among the more common serious collisions, largely because they often happen at higher combined speeds than a typical rear-end crash. The underlying legal rule is fairly consistent across states: a driver turning left across oncoming traffic has a duty to yield the right-of-way, and a collision during that turn is usually treated as evidence that duty wasn't met.

Why the turning driver is usually presumed at fault

Traffic law generally requires a driver making a left turn to wait until it's safe to do so — meaning oncoming traffic is far enough away, or slow enough, that the turn can be completed without requiring the other driver to brake or swerve. When a collision happens during a left turn, the default assumption is that the turning driver misjudged the gap or turned when it genuinely wasn't safe. This is why the turning driver is usually presumed at fault, similar in structure to the rear-end presumption: it's a starting point based on who had the legal duty, not an unchallengeable conclusion.

When fault shifts to the oncoming driver

The presumption can shift, most commonly when the oncoming vehicle's own conduct made the crash unavoidable or contributed to it:

• Speeding. If the oncoming driver was traveling well above the limit, they may have closed the gap faster than the turning driver could reasonably have anticipated, which can shift some fault their way.
• Running a red light or stop sign. A turning driver who reasonably relied on the assumption that cross-traffic would stop isn't necessarily at fault if the other driver ran the signal.
• Erratic or unlawful driving more generally — sudden lane changes, driving while impaired, or other unsafe behavior that a reasonable turning driver couldn't have accounted for.

These exceptions typically need real evidence — a citation, traffic-camera footage, or credible witness accounts — since "they were speeding" is also, unsurprisingly, a very common thing to say after being at fault for a turn.

Protected turns change the picture

A dedicated, protected green left-turn arrow is a materially different situation from turning on a plain green light or a yellow. With a protected arrow, oncoming traffic is required to be stopped, and the turning driver generally has the right-of-way — meaning a collision during a protected turn shifts the fault analysis toward whoever entered the intersection against their signal, rather than toward the turning driver by default.

Both drivers can share fault

As with most fault scenarios, comparative negligence rules mean responsibility isn't always all-or-nothing. A turning driver who misjudged a gap and an oncoming driver who was moderately speeding can both be found partially at fault, with the specific split depending on your state's rules and the details of the crash. See our guide on state fault rules for how comparative negligence works where you are.