["https:\/\/schema.org\/",[{"@type":"BlogPosting","@id":"https:\/\/www.attorneysofidaho.com\/blog\/an-analysis-of-contributing-factors-in-idaho-car-crash-causes\/#article","mainEntityOfPage":{"@id":"https:\/\/www.attorneysofidaho.com\/blog\/an-analysis-of-contributing-factors-in-idaho-car-crash-causes\/"},"headline":"Leading Causes of Idaho Car Crashes: 2025 Contributing Factors","name":"Leading Causes of Idaho Car Crashes: 2025 Contributing Factors","description":"See what Idaho's final 2025 crash report says about leading single- and multi-vehicle contributing circumstances, with definitions and limitations.","datePublished":"2025-04-17T05:00:19+00:00","dateModified":"2026-09-03T09:16:01+00:00","author":{"@type":"Organization","name":"Attorneys of Idaho","url":"https:\/\/www.attorneysofidaho.com\/about-us\/"},"publisher":{"@type":"Organization","name":"Attorneys of Idaho","logo":{"@type":"ImageObject","@id":"https:\/\/www.attorneysofidaho.com\/wp-content\/uploads\/2025\/07\/logo-footer.svg","url":"https:\/\/www.attorneysofidaho.com\/wp-content\/uploads\/2025\/07\/logo-footer.svg","width":0,"height":0}},"image":"https:\/\/www.attorneysofidaho.com\/wp-content\/uploads\/2025\/04\/an-analysis-of-contributing-factors-in-idaho-car-crash-causes-blog-img.png","url":"https:\/\/www.attorneysofidaho.com\/blog\/an-analysis-of-contributing-factors-in-idaho-car-crash-causes\/","about":["Car Accidents"],"wordCount":1871,"articleBody":"Short answer: Idaho’s final 2025 report does not name one cause for every crash. For one-vehicle crashes, its top recorded factors were animals in the road, speed, and failing to stay in a lane. For crashes with more than one road user, the top factors were failing to yield, following too closely, and inattention or distraction. These are factors marked by officers, not court findings about fault.What Does ITD Mean by a Contributing Circumstance?The Idaho Transportation Department’s 2025 Statewide Crash Database report comes from reports filed by Idaho law enforcement. For each vehicle, an officer may mark as many as three factors that may have played a part. One crash may therefore appear in more than one group.An officer’s label is not a court finding of negligence, legal cause, or each person’s share of fault. ITD also keeps crash facts, vehicle facts, and outcomes for people at different data levels. Mixing those levels can turn a useful number into a misleading claim.Single-Vehicle Crashes: Animals, Speed, and Lane Departure Led the FigureITD counted 7,954 one-vehicle crashes in 2025. They were 7,954 \/ 28,127 x 100 = 28.28% of all reported crashes. They accounted for 107 \/ 231 x 100 = 46.32% of fatal crashes. Crashes with more than one road user were more common. Still, one-vehicle crashes made up a larger share of fatal crashes than of all crashes.Leading entries in ITD Figure 3, single-vehicle crashes, 2025Order in figureRecorded circumstanceITD published percentageRaw numerator \/ numeric denominator1Animal(s) in roadway23%Not published in the annual report2Speed18%Not published in the annual report3Failed to maintain lane15%Not published in the annual reportTied nextInattention or distraction9%Not published in the annual reportTied nextAlcohol or drug impaired9%Not published in the annual reportITD excluded \u201cnone,\u201d \u201cnot applicable,\u201d and \u201cunknown\u201d from its percentage work. It grouped smaller factors as \u201call other.\u201d The report does not give the count behind each slice or the base count used for Figure 3. We therefore repeat ITD’s rounded labels. We do not present them as our own rates.Multiple-Vehicle Crashes: Yielding and Following Distance LedITD counted 20,173 crashes with more than one road user in 2025. That is 20,173 \/ 28,127 x 100 = 71.72% of all crashes. In this section, ITD includes crashes between motor vehicles. It also includes cases in which a motor vehicle strikes a person walking, a bicyclist, a train, or an equestrian.Leading entries in ITD Figure 4, multiple-vehicle crashes, 2025Order in figureRecorded circumstanceITD published percentageRaw numerator \/ numeric denominator1Failed to yield20%Not published in the annual report2Followed too closely18%Not published in the annual report3Inattention or distraction15%Not published in the annual report4Failed to obey signal or stop sign7%Not published in the annual report5Improper lane change6%Not published in the annual reportTied nextFailed to maintain lane4%Not published in the annual reportTied nextImproper turn4%Not published in the annual reportTied nextSpeed4%Not published in the annual reportFigure 4 also omits the raw count and base count behind each percentage. It does not show factors below 2% one by one. The figure supports the order above and a broad view of the pattern. It does not support a more precise ranking built from the report alone.There Is No Single ITD \u201cNumber One Cause of Death\u201dITD uses different measures for different questions. In fatal one-vehicle crashes, \u201coverturn\u201d was the top most harmful event in Table 7. ITD lists it at 52.3% of vehicles. That label means the event that caused the most injury or property damage to a vehicle. It does not explain why the vehicle rolled, name a medical cause of death, or decide legal fault.For all fatal crashes, ITD Figure 12 shows alcohol or drug involvement at 21%, failure to maintain lane at 17%, and speed at 15%. The report does not give the raw counts for those bars. An officer may also mark up to three factors for each vehicle. The percentages cannot be added or treated as separate shares of fatal crashes.Aggressive, Distracted, and Impaired Driving Are Overlapping Focus CategoriesITD also reports broad highway-safety groups. They overlap with the factors above and may overlap with each other. Do not add their shares.Reproducible 2025 focus-category calculationsITD categoryCrash calculationShare of all crashesFatality calculationShare of all fatalitiesAggressive driving13,610 \/ 28,12748.39% (ITD rounds to 48%)99 \/ 25239.29%Distracted driving4,396 \/ 28,12715.63% (ITD: 15.6%)34 \/ 25213.49% (ITD: 13.5%)Impaired driving1,613 \/ 28,1275.73% (ITD: 5.7%)87 \/ 25234.52% (ITD: 34.5%)ITD’s aggressive-driving group includes failure to yield, running a stop sign or signal, speeding, driving too fast for conditions, and following too closely. A crash enters the distracted-driving group when an officer marks inattention or a distraction in or on the vehicle. The impaired-driving group comes from the crash report. It can include an impaired driver, pedestrian, or bicyclist.Youth, Restraint Use, and Economic Cost Use Different DenominatorsITD also tracks youthful-driver involvement, safety-restraint use, and modeled economic cost. These measures provide safety context, but they are not additional causal rankings. Each uses a different population or method, so their percentages cannot be compared as if they shared one denominator.Youthful-driver, restraint-use, and economic-cost measures from Idaho’s 2025 crash reportMeasure2025 valueNumerator, denominator, and calculationDefinition or limitCrashes involving a driver age 15-196,092; 21.66% of all crashes6,092 \/ 28,127 x 100 = 21.6589%Crash involvement, not a finding that the youthful driver caused the crash; ITD Table 36Drivers age 15-19 as a share of licensed drivers87,172; 5.83%87,172 \/ 1,495,112 x 100 = 5.8305%Licensed-driver distribution; ITD Tables 17 and 36Drivers age 15-19 in fatal or injury crashes1,876; 12.43%1,876 \/ 15,093 x 100 = 12.4296%Drivers, not crashes or people injured; 1,876 is the sum of the age 15-19 rows in ITD Table 17Fatal-or-injury crash involvement ratio for drivers age 15-192.13; ITD reports 2.112.4296% \/ 5.8305% = 2.1318Share of drivers in fatal or injury crashes divided by share of licensed drivers; not an individual probabilityObserved statewide seat-belt use87.0%Raw people observed \/ eligible people observed is not published in the annual reportRepresentative shoulder-harness observation at 180 sites for passenger cars, pickups, SUVs, and vans; ITD Table 27 and releaseBelt use among killed passenger-vehicle occupants age 7 and older70 of 169; 41.42%70 \/ 169 x 100 = 41.4201%Crash-reported group: 70 used a belt, 71 did not, and 28 were unknown; ITD Tables 29-30Modeled economic cost of all Idaho crashes$6,081,450,113; $2,996 per resident$6,081,450,113 \/ 2,029,700 residents = $2,996.23, reported as $2,996AIS-to-KABCO and U.S. DOT value-based estimate, not bills, compensation, or case value; ITD Table 4Modeled economic cost of impaired-driving crashes$1,534,004,472; 25.22% of statewide estimate$1,534,004,472 \/ $6,081,450,113 x 100 = 25.2243%ITD Table 22 estimate; the report rounds the share to 25%Modeled economic cost of crashes involving youthful driversNearly $954 million; ITD reports 16%Comparison denominator is the $6,081,450,113 statewide estimate; exact youthful-driver dollars are not publishedPublished approximate amount and rounded share in the Table 36 narrative; do not reverse-engineer false precisionYouthful-driver involvement is not a causation findingITD defines youthful drivers as ages 15 through 19. The 2.1 figure is an involvement ratio: that group was 5.8% of licensed drivers but 12.4% of drivers in fatal or injury crashes. It is not adjusted for miles driven and does not say that every youthful driver caused the crash. The 32 people killed in crashes involving youthful drivers in 2025 were people of all ages; ITD reports that 17 were the youthful drivers.Observed belt use and crash-reported belt use are different samplesThe 87.0% observed-use figure comes from a representative roadside survey at 180 sites, according to ITD’s release, not from all Idaho occupants or the crash database. The annual report does not publish the number of people observed, so that percentage cannot be independently recomputed from the report. The 70-of-169 figure concerns only killed occupants age 7 and older in specified passenger vehicles. It includes a separate unknown-use group. Neither percentage should be substituted for the other.Economic cost is a model, not a legal recovery measureITD applies injury-severity occurrence costs derived from an AIS-to-KABCO conversion resource and U.S. Department of Transportation valuation guidance. The result estimates economic impact for traffic-safety analysis. It is not a sum of medical bills, verdicts, settlements, or damages available in any claim. Focus groups can overlap, so their modeled costs must not be added together.What These Patterns Suggest for PreventionThe data supports practical steps. It does not prove that one act caused a given crash:Scan for wildlife and roadway hazards, especially when visibility is limited.Choose a speed that is lawful and appropriate for traffic, visibility, weather, and road conditions.Leave enough following distance to respond without abrupt braking.Approach intersections ready to yield and obey traffic controls.Put distracting tasks away before driving and arrange a sober ride whenever alcohol or impairing drugs are involved.These steps address common patterns. They cannot guarantee that a crash will not occur.Statewide Patterns Do Not Determine Fault in One CrashA statewide group does not prove who was at fault in one crash. That review may use the crash report, photos, video, witness accounts, road evidence, vehicle data, and other records. Read how fault is determined in Idaho car accidents, what evidence may matter in an Idaho injury case, and how Idaho comparative-fault rules work.For statewide totals and five-year rates, use the separate Idaho car-accident statistics reference. If you want the firm to review the facts of one crash, visit the Idaho car-accident practice page.Methodology, Limitations, and Update ScheduleDataset: ITD Statewide Crash Database, calendar year 2025.Publication: Idaho Traffic Crashes 2025, released August 13, 2026.Coverage: qualifying motor-vehicle crashes on public roads investigated by law enforcement.Counting rule: crash-, unit-, and person-level measures use different denominators; an officer may record up to three contributing circumstances per vehicle.Figure limitation: Figures 3, 4, and 12 and Table 7 publish rounded percentages without the raw category counts needed for independent calculation. Those values are labeled as published, not recomputed.Recomputed values: Focus-category shares use the published category count divided by 28,127 total crashes; fatality shares use the category’s people killed divided by 252 total fatalities.Youthful-driver calculations: Table 17 age rows supply the numeric licensed-driver and fatal-or-injury-driver denominators; Table 36 supplies crash and fatality context. Involvement is not assigned causation.Restraint measures: Table 27’s observational result and Tables 29-30’s crash-reported result use different groups. The report does not publish the raw statewide observational count.Economic-cost method: Table 4 and Table 22 are modeled estimates based on injury-severity occurrence values. They are not case damages, and overlapping focus-area estimates are not additive.Companion files: A contributing-circumstance table and a separate youth\/restraint\/economic context table record each value, formula, locator, and source limitation for CMS upload.Review owner: Annual data verification for this page belongs to Attorneys of Idaho content operations.Next source check: Begin on August 2, 2027 and inspect ITD’s annual-report library each week until the final 2026 edition appears. Complete the corresponding page and data-file revision within 10 business days after publication.Download the Attorneys of Idaho companion files: Idaho 2025 contributing-circumstances companion CSV and Idaho 2025 youth, restraint, and economic-context companion CSV. These Attorneys of Idaho research companions organize information from the cited sources; they are not official ITD datasets or raw crash records.Sources and ReferencesIdaho Transportation Department, Idaho Traffic Crashes 2025 – explanation of data; Tables 4, 6-7, 14, 17, 21-22, 27, 29-30, 33, 35-36; and Figures 3-4 and 12.Idaho Office of Highway Safety’s crash-data and annual-publication hub – current report library and methodology entry point.ITD’s August 13, 2026 release for the final 2025 report – publication date, 180-site restraint-survey context, and agency summary.This article provides general information, not legal advice. 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