A left-turn failure-to-yield violation under Vehicle Code 21801 is one of the most common citations issued after an intersection collision, and like other minor traffic violations it can become the stated basis for a DUI stop. I am Joel Brand, and here is what the statute requires and how it factors into a DUI.
The text of the law
Vehicle Code 21801. (a) The driver of a vehicle intending to turn to the left or to complete a U-turn upon a highway, or to turn left into public or private property, or an alley, shall yield the right-of-way to all vehicles approaching from the opposite direction which are close enough to constitute a hazard at any time during the turning movement, and shall continue to yield the right-of-way to the approaching vehicles until the left turn or U-turn can be made with reasonable safety. (b) A driver having yielded as prescribed in subdivision (a), and having given a signal when and as required by this code, may turn left or complete a U-turn, and the drivers of vehicles approaching the intersection or the entrance to the property or alley from the opposite direction shall yield the right-of-way to the turning vehicle.
What the statute requires
Section 21801 governs the duty to yield when turning left or making a U-turn. A driver intending to turn left must yield to oncoming traffic that is close enough to be a hazard, and must keep yielding until the turn can be completed with reasonable safety. The companion rule in subdivision (b) is just as important: once a left-turning driver has properly yielded and signaled, the oncoming driver must then yield to the turning vehicle. A violation is an infraction that adds one point to your record under the DMV point system. The closely related statute, Vehicle Code 21800, covers right-of-way at uncontrolled intersections, and the two are frequently confused in citations.
The "reasonable safety" and "hazard" standards are judgment calls
The heart of the statute is built on two flexible phrases: whether oncoming traffic was "close enough to constitute a hazard," and whether the turn could be made "with reasonable safety." Neither is a bright line. Both depend on speed, distance, visibility, and timing, all judged in a fraction of a second and reconstructed afterward from imperfect memories. Whether a left-turning driver actually violated 21801, or made a perfectly reasonable judgment that an oncoming car was far enough away, is frequently a genuine matter of dispute. That ambiguity matters, because a violation that cannot be clearly established is a shaky foundation for anything built on top of it.
Why it matters in a DUI
In a DUI, an officer may cite a left-turn violation as the reason for the stop, or point to it as evidence of supposedly impaired driving. But a momentary misjudgment of an oncoming car's speed and distance is something sober drivers do routinely, and it is not proof of impairment. The two questions, whether you committed a traffic violation and whether you were impaired, are separate, and each requires its own proof through its own evidence.
Challenging the stop
As with any traffic-based DUI stop, the threshold question is whether the officer had a lawful basis to pull you over. If the left-turn claim does not hold up, or the right-of-way facts are too murky to establish a clear violation, I can challenge the stop with a motion to suppress under Penal Code 1538.5. A successful motion can exclude the evidence that followed and unravel the DUI, because the lawfulness of the stop is the threshold question on which everything else depends.
When there was a collision
Left-turn citations very often arise out of an intersection accident, which adds a layer of complexity. If there was a collision, the question of who actually had the right of way becomes both a traffic-law issue and a fault issue, and an accident-reconstruction analysis can tell a very different story than the responding officer's first impression. A common scenario is the oncoming driver who was speeding or ran a yellow turning red, which can shift fault away from the left-turning driver entirely. Fault for the accident is also separate from impairment, and I keep the two from being conflated, since a driver can be faultless in the crash and still be wrongly assumed impaired, or at fault in the crash yet entirely sober.
Points, fines, and the record
As a standalone infraction, a left-turn failure to yield carries a fine plus assessments and one point. On its own that is minor, but combined with a DUI it adds to your record and can be addressed as part of the overall resolution. Keeping the point off matters for insurance and for the DMV's negligent-operator thresholds, where accumulating too many points in a set window can trigger a separate license suspension. That is one more reason not to simply pay the ticket when a DUI is attached.
A single misjudgment is not impairment
Prosecutors sometimes lean on a left-turn error to suggest the driver was impaired. That inference is weak. Misjudging the speed of an oncoming car while waiting to turn left is one of the most common mistakes sober drivers make, especially at busy intersections, in poor light, or with obstructed sightlines. It says nothing, by itself, about alcohol. I make sure a momentary turning error is treated as exactly that, rather than allowed to stand in for the proof of impairment the prosecution must establish through the chemistry and the field evidence.
How these cases resolve
On its own, a left-turn infraction is a minor part of a combined case. The realistic goals are to keep the point off your record, to dismiss the infraction where the right-of-way facts are genuinely disputed, and to fold it into the overall resolution of the DUI so it carries no separate consequence. Where the citation arose from a collision, resolving any restitution can also help. As with every part of a DUI, how the yield count is handled depends on the strength of the rest of the case, which is why I look at all of it together rather than in isolation.
How it fits the larger defense
The left-turn issue is one piece of attacking the lawfulness of the stop, the most powerful category of DUI defense. It works alongside challenges to the field sobriety testing and the chemical evidence. See my top DUI defenses and the related right-of-way rule in VC 21800.
Stopped after a left turn and arrested for DUI? Let's talk.
Whether that stop was lawful may be central to your case, and it is exactly what I review. Use the free case analysis on this page, or call me directly at (888) 271-6644. I answer my own phone, 24/7.
Related traffic-stop charges: misdemeanor hit and run (VC 20002), following too closely (VC 21703), stop sign violations (VC 22450).