Motorcycle-involved fatal crashes are a major concern when drivers turn left, while motorists ages 75 and older record the highest overall population-adjusted left-turn fatal-crash involvement rates, according to new research from Sweet James.
The nationwide analysis, covering 2020 through 2024, found that left-turning drivers were involved in fatal crashes at a rate 14.37 times higher than drivers turning right.
The findings highlight the dangers associated with crossing opposing traffic, particularly when motorists must simultaneously account for motorcycles, pedestrians, cyclists, and vehicles approaching from multiple directions.
Using data from the National Highway Traffic Safety Administration’s Fatality Analysis Reporting System, Sweet James examined 11 fatal-crash risk indicators across all 50 states and Washington, D.C.
The resulting Left Turn Fatal Crash Risk Index identified substantial differences by age, gender, vehicle type, and driving behavior, along with significant geographic disparities in crashes involving vulnerable road users.
Although drivers ages 75 and older recorded the highest overall population-adjusted left-turn fatal-crash involvement rate, the study found that younger drivers led several other categories, including motorcycle-related crashes, pedestrian involvement, impairment, and hit-and-run incidents.
The results demonstrate that fatal left-turn crash involvement does not follow one consistent demographic pattern. Instead, the nature of the collision and the road users involved can substantially change which groups appear most prominently in the data.
Motorcycle Involvement Is a Major Vulnerable-Road-User Concern
Among the vulnerable road users examined, motorcycle involvement stood out as the most prominent category in fatal crashes involving left-turning drivers.
The study found that the national motorcycle-involvement rate was approximately 27 times the pedestrian-involvement rate and roughly 90 times the cyclist-involvement rate.
National pedestrian-involved fatal left-turn crashes occurred at a rate of 0.10 per 100,000 residents ages 15 and older, while cyclist-involving crashes occurred at a rate of 0.03.
Vulnerable Road Users in Fatal Left-Turn Crashes
| Road-User Category | National Findings |
|---|---|
| Motorcycles | Approximately 27 times the pedestrian-involvement rate |
| Pedestrians | 0.10 per 100K residents ages 15+ |
| Cyclists | 0.03 per 100K residents ages 15+ |
These population-adjusted statistics measure the involvement of left-turning drivers in fatal crashes that included each road-user category. They do not represent the probability that an individual motorcyclist, pedestrian, or cyclist will be killed.
The disparity is nevertheless important because motorcycles are difficult for some motorists to assess accurately when approaching an intersection.
Unlike conventional passenger vehicles, motorcycles have a narrower visual profile and provide riders with limited protection during impact.
Left-turning motorists who misjudge an approaching motorcycle’s speed or distance can create a conflict with potentially severe consequences.
The dangers are illustrated by a fatal April 2025 collision in Elk Grove, California, where a 23-year-old motorcyclist died after an oncoming SUV turned left across his path. The SUV driver was subsequently charged with misdemeanor vehicular manslaughter.
The incident illustrates how a routine turning maneuver can have devastating consequences when a driver fails to yield to an approaching road user.
Arizona, Florida, and South Carolina Lead Motorcycle-Involvement Rates
The motorcycle-related findings also revealed major differences between states.
Arizona recorded the nation’s highest population-adjusted rate of motorcycle-involved fatal crashes associated with left-turning drivers, at 6.09 per 100,000 residents ages 15 and older.
Florida followed at 5.94, with South Carolina third at 5.34.
Five States With the Highest Motorcycle-Involved Fatal Left-Turn Crash Rates
| Rank | State | Rate Per 100K |
|---|---|---|
| 1 | Arizona | 6.09 |
| 2 | Florida | 5.94 |
| 3 | South Carolina | 5.34 |
| 4 | Nevada | 5.01 |
| 5 | Delaware | 4.60 |
Motorcycle involvement was especially concentrated in states that also ranked highly in the overall composite risk index.
Seven of the 10 states with the highest total left-turn fatal-crash risk scores also ranked among the top 10 for motorcycle involvement.
Arizona emerged as a particularly concerning location because it ranked first for motorcycle involvement, third for pedestrian involvement, and third for cyclist involvement.
Florida showed a similar concentration, ranking second for motorcycle involvement and fourth for both pedestrian and cyclist involvement.
These overlapping rankings indicate that left-turn safety challenges in some states extend beyond passenger-vehicle collisions.
Younger Drivers Lead Motorcycle-Related Left-Turn Crash Involvement
One of the study’s notable findings was the difference between the age groups leading overall fatal left-turn crash involvement and those most prominent in crashes involving motorcycles.
Drivers ages 75 and older recorded the highest overall left-turn fatal-crash involvement rate nationally.
However, drivers ages 21 to 24 had the highest motorcycle-involved rate among left-turning drivers, at 3.10 per 100,000 residents in their age group.
Drivers ages 75 and older followed at 2.94, while those ages 25 to 34 recorded 2.91.
| Driver Age Group | Motorcycle-Involved Fatal Left-Turn Rate Per 100K |
|---|---|
| 21–24 | 3.10 |
| 75 and older | 2.94 |
| 25–34 | 2.91 |
These age categories refer to the left-turning drivers involved in the fatal crashes, not necessarily the age of the motorcyclists.
Men recorded a motorcycle-involvement rate of 3.41 per 100,000, compared with 2.01 among women, approximately 70% higher.
The findings reveal that motorcycle-related left-turn collisions have a somewhat different demographic distribution than fatal left-turn crashes overall.
Rather than being dominated exclusively by older drivers, motorcycle involvement is particularly pronounced among younger adult motorists.
Pedestrian Crashes Reveal a Different Geographic Pattern
Although pedestrian involvement occurred at a substantially lower national population-adjusted rate than motorcycle involvement, several jurisdictions stood out.
Utah recorded the nation’s highest pedestrian-involved fatal left-turn crash rate, at 0.57 per 100,000 residents ages 15 and older.
That was more than five times the national rate of 0.10.
Washington, D.C., ranked second at 0.35, followed by Arizona at 0.26, Florida at 0.25, and Missouri at 0.22.
Jurisdictions With the Highest Pedestrian-Involved Fatal Left-Turn Crash Rates
| Rank | Jurisdiction | Rate Per 100K |
|---|---|---|
| 1 | Utah | 0.57 |
| 2 | Washington, D.C. | 0.35 |
| 3 | Arizona | 0.26 |
| 4 | Florida | 0.25 |
| 5 | Missouri | 0.22 |
The geographic pattern differs from the overall composite index, where Arizona ranked first and Florida recorded the highest direct left-turn crash involvement rate.
Utah’s position at the top of the pedestrian category illustrates how a jurisdiction can show a particularly elevated rate for one type of road-user involvement without necessarily leading the overall index.
The study also identified a gender difference among left-turning drivers involved in fatal pedestrian crashes.
Men recorded a rate of 0.12 per 100,000, compared with 0.07 among women.
Drivers ages 21 to 24 had the highest age-specific rate at 0.12, narrowly ahead of drivers ages 35 to 44 at 0.11.
These findings suggest that pedestrian-involved left-turn crashes require a different prevention focus than the broader category of fatal turning collisions.
Pedestrians are especially vulnerable when drivers concentrate on identifying gaps in opposing traffic and overlook someone entering the crosswalk.
Intersection visibility, turning speeds, and the separation of pedestrian and vehicle movements are therefore particularly relevant to reducing these conflicts.
Delaware Has the Highest Cyclist-Involvement Rate
Cyclist-involving fatal left-turn crashes were the least common vulnerable-road-user category in the Sweet James analysis.
Nationally, left-turning drivers were involved in fatal cyclist crashes at a rate of 0.03 per 100,000 residents ages 15 and older.
Delaware recorded the highest state rate at 0.24, followed by Washington, D.C., at 0.18.
Arizona ranked third at 0.16, while Florida and New Hampshire followed at 0.10 and 0.08, respectively.
| Rank | Jurisdiction | Cyclist-Involved Rate Per 100K |
|---|---|---|
| 1 | Delaware | 0.24 |
| 2 | Washington, D.C. | 0.18 |
| 3 | Arizona | 0.16 |
| 4 | Florida | 0.10 |
| 5 | New Hampshire | 0.08 |
Men had a higher recorded rate of cyclist involvement than women, while drivers ages 25 to 34 led the age-specific comparison at 0.05 per 100,000.
Drivers ages 75 and older followed at 0.04.
The findings show that cyclist-involved fatal left-turn crashes are relatively uncommon compared with motorcycle-related incidents, but several jurisdictions record rates well above the national figure.
Cyclists can be especially vulnerable at intersections where turning motorists must cross bicycle lanes or shared road space.
The analysis does not provide cyclist travel-distance exposure, meaning it cannot determine whether individual cyclists face greater per-trip risk in one state than another.
Drivers Ages 75 and Older Have the Highest Overall Involvement Rate
When all fatal left-turn crashes were considered, older drivers emerged as the highest-rate demographic group.
Drivers ages 75 and older had a national involvement rate of 12.77 per 100,000, more than double the 6.33 rate among drivers ages 65 to 74.
Drivers ages 21 to 24 recorded a rate of 6.04.
The older-driver pattern was unusually widespread, with motorists ages 75 and older recording the highest age-specific rate in 46 of the 51 jurisdictions examined.
States With the Highest Left-Turn Fatal-Crash Rates Among Drivers Ages 75+
| Rank | State | Rate Per 100K Drivers’ Age-Group Population |
|---|---|---|
| 1 | South Carolina | 25.68 |
| 2 | Kentucky | 24.98 |
| 3 | Florida | 22.19 |
South Carolina’s rate of 25.68 was approximately twice the national figure for drivers in this age category.
The research does not establish that age alone causes these collisions. Population-adjusted crash involvement can reflect numerous factors, including driving exposure, roadway conditions, health, visibility, and traffic complexity.
However, the findings emphasize the challenges of completing a maneuver that requires rapid assessments of several moving objects.
Left-turning drivers must judge approaching vehicle speeds, identify appropriate gaps, check traffic controls, and monitor pedestrians and cyclists.
These simultaneous decisions can be particularly demanding when traffic volumes are high or sight lines are obstructed.
Distraction, Impairment, and Hit-and-Run Risks Vary by Age
The study identified separate demographic patterns for three behaviors associated with fatal left-turn crashes.
Distraction was most pronounced among drivers ages 75 and older, while impairment was concentrated among drivers ages 25 to 34.
Hit-and-run involvement peaked among drivers ages 21 to 24.
National Behavioral Risk Findings
| Risk Category | Highest-Rate Age Group | Rate Per 100K |
|---|---|---|
| Distracted driving | 75 and older | 0.89 |
| Impaired driving | 25–34 | 0.43 |
| Hit-and-run involvement | 21–24 | 0.15 |
The national distracted left-turn fatal-crash involvement rate was 0.39 per 100,000 residents ages 15 and older.
Drivers ages 75 and older recorded a rate of 0.89, more than twice the 0.41 rate among those ages 65 to 74.
Impairment produced a different pattern, with drivers ages 25 to 34 recording the highest age-specific rate at 0.43, followed by ages 35 to 44 at 0.41.
Men had an impaired-driving involvement rate of 0.46, compared with 0.18 among women.
For hit-and-run incidents, drivers ages 21 to 24 recorded a rate of 0.15, narrowly exceeding the approximately 0.14 rates observed among drivers ages 25 to 34 and 35 to 44.
These categories represent separate crash-involvement patterns. They should not be interpreted as evidence that the same drivers or crashes involved all three behaviors.
Passenger Cars Lead Vehicle-Type Involvement
The analysis also examined vehicle categories involved in fatal left-turn crashes.
Passenger cars recorded the highest national population-adjusted vehicle-type involvement rate at 2.50 per 100,000 residents ages 15 and older.
That finding is important because passenger cars are among the most common vehicles on American roads.
The result does not establish that passenger cars are intrinsically more dangerous than other vehicle types. Instead, it reflects their involvement in the fatal-crash records examined.
The researchers also examined time-of-day patterns, finding that involvement rates rose during the late morning within the available dataset.
| Time Period | Fatal Left-Turn Driver Involvement Rate Per 100K |
|---|---|
| 10–10:59 a.m. | 0.24 |
| 11–11:59 a.m. | 0.29 |
| Noon–12:59 p.m. | 0.35 |
Noon to 12:59 p.m. recorded the highest rate within the study’s available time window.
However, the time-of-day dataset only covered crashes occurring between 1 a.m. and 12:59 p.m. Afternoon and evening data were not included, so noon cannot be identified as the most dangerous hour across a full 24-hour day.
Intersection Redesigns Could Address Some of the Most Dangerous Conflicts
The Sweet James research also examined countermeasures intended to reduce conflicts between turning drivers and other road users.
Some treatments aim to improve visibility. Others reduce turning speeds or eliminate direct crossings through opposing traffic.
Federal Highway Administration research cited in the study found that dedicated turn lanes were associated with reductions of 28% to 48% in total crashes, while positive-offset turn lanes were associated with a 36% reduction in fatal and injury crashes.
Engineering Strategies and Reported Safety Outcomes
| Safety Improvement | Reported Outcome |
|---|---|
| Dedicated left-turn lanes | 28%–48% reduction in total crashes |
| Positive-offset left-turn lanes | 36% reduction in fatal and injury crashes |
| Median U-Turn intersections | 75% fewer vehicle crossing conflict points |
| Restricted Crossing U-Turn designs | Up to 87% fewer crossing conflict points |
| San Francisco centerline-hardening pilot | 17% reduction in average left-turn speeds |
| Washington, D.C., centerline-hardening treatments | 70.5% reduction in vehicle-pedestrian conflicts |
The distinction between reduced conflicts and reduced actual crashes is important.
San Francisco’s centerline-hardening pilot reduced average left-turn speeds by 17% and the likelihood of turns exceeding 15 mph by 71%.
Washington, D.C., similarly reported a 70.5% reduction in vehicle-pedestrian conflicts, a 9.8% reduction in average left-turn speeds, and a 67.1% reduction in the odds of turning faster than 15 mph.
Those findings measure changes in driver behavior and conflicts rather than equivalent reductions in recorded crashes.
Still, they provide evidence that intersection geometry can influence how drivers approach vulnerable road users.
Why Reducing Left-Turn Conflicts Matters
Conventional intersections frequently require motorists to assess several potential conflicts before crossing opposing lanes.
A traditional four-leg intersection contains 16 vehicle crossing conflict points, creating opportunities for severe angle collisions when drivers misjudge traffic.
Median U-Turn designs can reduce those crossing conflicts to four, while Restricted Crossing U-Turn configurations can eliminate even more direct crossing opportunities.
Federal Highway Administration findings cited by Sweet James associate Median U-Turn intersections with a reduction of nearly 70% in severe crashes involving crossing conflicts.
A Michigan evaluation also found average reductions of 31% in total crashes and 32% in injury crashes following the installation of Median U-Turn designs.
These interventions are particularly relevant in locations where drivers must turn across several lanes of traffic or where pedestrians and cyclists regularly cross vehicle paths.
Separating turning movements, improving visibility, and reducing vehicle speeds can help address risks that are difficult to eliminate through driver education alone.
National Findings Point to Different Safety Priorities for Different Road Users
The five-year Sweet James analysis suggests that left-turn safety challenges cannot be reduced to one type of driver, vehicle, or intersection.
Motorcycles represent a major vulnerable-road-user concern, especially in Arizona, Florida, South Carolina, Nevada, and Delaware.
Pedestrian involvement is particularly elevated in Utah and Washington, D.C., while Delaware records the highest cyclist-involvement rate.
Drivers ages 75 and older have the highest overall population-adjusted fatal left-turn crash involvement rate, but younger motorists lead several behavioral and vulnerable-road-user categories.
Across the nation, the rate of fatal-crash involvement among left-turning drivers remains more than 14 times the rate associated with right turns.
Although these population-based rates do not measure danger per individual turning maneuver, the consistency of the national disparity underscores the need for targeted safety improvements.
The findings point toward an approach combining driver attention, safer intersection layouts, protected turning movements, and better accommodation of motorcycles, pedestrians, and cyclists.
Reducing direct crossing conflicts may be especially important in locations where high traffic volumes and vulnerable road users create multiple opportunities for severe crashes.
Ultimately, the study demonstrates that reducing fatal left-turn collisions requires more than identifying which drivers appear most frequently in crash records. It also requires addressing the intersection conditions and turning movements that place other road users in harm’s way.