Almost everyone believes the driver turning left is automatically at fault, and insurers are content to let that belief do their work for them. It is not the rule in Colorado. The turning driver has to yield, but the other side’s claim still fails when the oncoming car was speeding, ran the light, was in a lane it should not have been in, or appeared from behind a hedge nobody could see past.
This post walks through what the yield rule actually requires, when the oncoming driver carries the blame, and how fault is proven after a turning collision. Our Denver car accident lawyers at Boesen Law can tell you where the fault in your crash is likely to land.
Reach out to our law firm for a no-cost, no-obligation consultation today. Call our personal injury lawyers in the state of Colorado at (303) 999-9999 or contact us online.
Colorado’s Yield Rule Says Less Than Insurers Suggest
Under the Model Traffic Code, a driver turning left across traffic must yield to any oncoming vehicle that is close enough to be an immediate hazard. That is the entire duty, and nothing in it makes the turning driver responsible for a car that was not an immediate hazard when the turn began.
That distinction decides cases. A vehicle traveling twenty miles per hour over the limit covers ground the turning driver had every reason to count on, and an approaching driver who entered on red was never entitled to the right of way in the first place. The question is not who was turning. It is what a reasonable driver could see and predict at the moment the wheel went over.
Protected and Unprotected Turns Are Different Cases in Colorado
The signal phase changes the analysis completely.
A green arrow gives the turning driver the right of way outright, so a crash during a protected phase usually means opposing traffic ran a red light. A green ball or a flashing yellow arrow gives permission to turn only after yielding, which puts the burden on the turning driver but does not excuse the oncoming vehicle’s speed. CDOT sets when an intersection gets a protected phase through its left-turn signal guidelines, so the phase your intersection was running is a documented fact rather than a matter of memory.
When the Oncoming Driver Carries the Fault
The presumption against the turning driver falls apart in a handful of recurring situations:
- Blocked sightlines from parked trucks, landscaping, or a stopped vehicle in the adjacent through lane.
- A driver passing on the right or using a turn lane to travel straight through.
- Late yellow racing, where the oncoming car accelerates into the intersection to beat the phase change.
- Turns from a private drive or parking lot where an unexpected vehicle enters at speed.
- Crashes with cyclists and motorcyclists, whose approach speed drivers routinely misjudge because the vehicle is narrow.
Each of these is provable, but only with evidence somebody has to go collect.
Speed Is Usually the Bigger Factor in Colorado, Not the Turn
Adjusters treat the turn as the cause. The crash data points somewhere else:
- CDOT’s preliminary numbers show 701 people killed on Colorado roads in 2025, up from 689 and ending two years of decline.
- 237 of those deaths came from speeding-related crashes, and 1,274 over the past five years.
- NHTSA counted 11,843 deaths in intersection crashes in a year. Seventy-three percent happened in urban areas, which is the Denver metro.
- When NHTSA studied intersection crashes on scene, the two leading reasons a left-turning driver caused one were an obstructed view and a misjudged gap. Neither is recklessness.
- Colorado pedestrian deaths rose 98.4 percent between 2015 and 2025. Denver County recorded 140 from 2020 to 2025, Adams 99, Arapahoe 79.
A car doing twenty over the limit is not the car the turning driver measured the gap against. That is why speed is the most common reason a turning driver’s fault percentage comes down, and why the word “turning” in a crash report tells you much less than the adjuster acts like it does. The pedestrian numbers land on the same point from the other direction, since a driver hunting for a gap in oncoming traffic is not watching the crosswalk ahead of the turn.
How Fault Is Actually Proven
A police report is an officer’s opinion formed quickly with partial information, not a verdict. What moves a fault percentage is measurable:
- Signal timing sheets from the operating agency, showing the length of the green arrow, the yellow, and the all-red interval, matched against the crash time.
- Event data recorders in both vehicles, which capture pre-impact speed, brake application, and steering input in the final seconds.
- Reconstruction from the physical evidence, using crush depth, rest positions, and debris spread to establish how fast the oncoming vehicle was really traveling.
- Corridor video from gas stations, dealerships, apartment buildings, and transit cameras, most of which is overwritten within days.
- Sightline photographs taken from the turning driver’s eye height at the same time of day, capturing the glare and obstructions a flat diagram erases.
Proving negligence is a different exercise than filling out a crash form at the scene, which is why fault assigned in the first week is so often reassigned later.
Comparative Fault Decides What You Collect
Colorado follows modified comparative negligence under C.R.S. § 13-21-111, which reduces your recovery by your share of the blame and bars it once your share exceeds the other driver’s.
In practice this is the entire negotiation. Moving an assigned percentage from forty down to fifteen changes the value of an identical injury dramatically, and it also changes what the types of damages you can claim are actually worth once the reduction is applied. A cyclist struck in a crosswalk by a left-turning car recovered $750,000 in one of our case results, while comparable injuries settle for far less elsewhere. The difference is rarely the injury. It is where the fault line got drawn.
What to Do After a Left-Turn Crash in Colorado
- Photograph both vehicles and the intersection before anything is moved, including the signal heads and any lane markings.
- Note the signal phase you saw and write it down while it is exact, not approximate.
- Get witness names and numbers from anyone who was not in either car, since independent accounts carry the most weight on right of way.
- Identify nearby cameras at businesses and residences along the corridor, and ask about footage within days rather than weeks.
- Get medical care the same day and describe the direction of the impact to every provider.
- Say nothing about fault to the other insurer until you have advice, because an offhand apology becomes a fault percentage.
Contact a Denver Car Accident Lawyer at Boesen Law
Fault is the whole case in a left-turn crash, and it is decided early, often by an adjuster reading a police narrative and a diagram. Once a file is coded as the turning driver’s fault, moving it takes evidence that somebody has to go collect while it still exists.
Boesen Law is a boutique firm with big results, we answer the phone at any hour, our attorneys and staff work in English, Spanish, and Russian, and there is no attorney fee unless we recover compensation for you. Contact Boesen Law for a free, in-person consultation and bring whatever you have, including photos, the report number, and the name of the insurer.
FAQs About Left-Turn Accident Fault in Colorado
Is the left-turning driver always at fault in Colorado?
No, and this is the single most costly assumption injured drivers make. Colorado requires a turning driver to yield to oncoming traffic that is close enough to be an immediate hazard, which is a judgment measured at the moment the turn begins. If the approaching vehicle was speeding, entered on a red light, passed illegally on the right, or was hidden behind an obstruction, the turning driver may carry little or none of the fault. Insurers apply the shorthand because it is cheap, not because it is the law.
How do you prove the other driver was speeding?
Through the vehicles rather than the drivers. Event data recorders in most modern cars capture speed, braking, and throttle in the seconds before impact, and a reconstruction expert can also derive speed from crush damage, skid evidence, and where each vehicle came to rest. Independent witnesses and nearby video help, but the physical evidence is what holds up when the other driver insists they were doing the limit.
What if the police report blames me for the turn?
A police report is an officer’s opinion formed quickly with partial information, and it is not binding on an insurer, a judge, or a jury. Officers frequently arrive after the vehicles have been moved and take a statement from a driver who was not seriously hurt while the injured party is being transported. Fault is routinely reassigned once signal timing, data downloads, and video the responding officer never had are produced.
Can I recover anything if I was partly responsible for the crash?
Yes, as long as your share of the fault stays below the other party’s. Colorado reduces your award by your percentage, so a claim worth $100,000 with twenty percent assigned to you pays $80,000, while a share above fifty percent ends the recovery entirely. Because so much money rides on where that line lands, fault percentages deserve the same attention as the medical evidence.
If I have three years to file, why is there any rush?
Motor vehicle claims generally carry a three-year deadline from the date of the crash, which sounds generous until you consider that intersection video is usually overwritten within a week or two and signal records are easier to obtain while the crash is recent. Colorado’s personal injury time limits end a claim the moment they run, no matter how strong the evidence would have been.
Reach out to our law firm for a no-cost, no-obligation consultation today. Call our personal injury lawyers in the state of Colorado at (303) 999-9999 or contact us online.
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