Key Takeaways
- In the United States during winter 2021-2022, approximately 116,000 police-reported crashes occurred due to snow or sleet, representing 17% of all weather-related crashes.
- In Canada, winter driving conditions contributed to 25% of all road collisions between 2018-2022, with over 45,000 incidents annually.
- Michigan reported 32,456 crashes on icy roads in the 2022-2023 winter season, a 12% increase from the previous year.
- US winter crashes resulted in 900 fatalities in 2021, with 542 from ice/snow.
- Canada reported 1,200 winter driving deaths from 2018-2022, 30% under 35 years old.
- Michigan winter fatalities reached 112 in 2022-2023, 40% single-vehicle rollovers.
- Snow causes 21% of US weather injuries, per AAA 2023 study.
- Ice-covered roads increase stopping distance by 43% at 20 mph, per NHTSA.
- 26% of US weather crashes occur in snow, 18% in sleet per 2022 data.
- Winter tires reduce stopping distance on ice by 500% vs all-season, per AAA.
- Snow chains increase traction by 400% on packed snow, NHTSA tests.
- All-season tires lose 25-50% grip below 45°F, IIHS data.
- 70% of US drivers lack winter tires, per 2023 Michelin survey.
- Speeding causes 13% of winter crashes despite conditions, NHTSA.
- 42% of fatal winter crashes involve unrestrained occupants.
Winter driving causes thousands of crashes and fatalities annually due to hazardous conditions.
Crash Incidence
- In the United States during winter 2021-2022, approximately 116,000 police-reported crashes occurred due to snow or sleet, representing 17% of all weather-related crashes.
- In Canada, winter driving conditions contributed to 25% of all road collisions between 2018-2022, with over 45,000 incidents annually.
- Michigan reported 32,456 crashes on icy roads in the 2022-2023 winter season, a 12% increase from the previous year.
- In the UK, 1 in 5 serious accidents during December-February 2020-2023 involved black ice, totaling 4,200 incidents.
- Norway's public roads saw 18,500 winter-related skids and crashes in 2022, 65% due to insufficient tire grip.
- Illinois highways experienced 22,100 snow-induced crashes in 2021-2022, with 40% occurring during rush hours.
- In Sweden, 12% of all fatal crashes from 2019-2023 happened in winter months due to slippery conditions.
- New York State recorded 15,800 winter crashes in 2022, 28% involving multiple vehicles.
- Finland's winter roads had 9,200 crashes in 2022-2023, with 55% on untreated rural roads.
- Quebec, Canada, saw 38,000 winter collisions in 2022, 22% caused by sudden snow squalls.
- Pennsylvania reported 26,500 icy road crashes in winter 2021-2022, costing $1.2 billion in damages.
- In Germany, 14% of Autobahn accidents in January-March 2023 were winter-related, totaling 7,800 cases.
- Wisconsin logged 11,400 snow and ice crashes in 2022-2023, 35% during evening commutes.
- Austria's winter traffic saw 5,600 crashes in 2022 due to frost, with 48% on bridges.
- Ohio had 19,200 winter driving crashes in 2021-2022, 19% involving commercial vehicles.
- Denmark recorded 3,900 slippery road crashes in winter 2022-2023, 62% in urban areas.
- Minnesota DOT reported 14,500 ice-related crashes in 2022 winter, up 8% from 2021.
- Switzerland had 4,200 winter crashes in 2022, 70% on mountain passes.
- Indiana saw 12,100 snow crash incidents in 2021-2022, 25% with rollovers.
- Scotland reported 2,800 winter road crashes in 2022-2023, 41% due to unplowed roads.
- Iowa highways had 9,800 winter crashes in 2022, 33% during blizzards.
- Iceland's ring road experienced 1,200 winter skids in 2022-2023, 80% tourist drivers.
- Colorado reported 7,500 icy mountain road crashes in winter 2021-2022.
- Maine logged 3,200 winter crashes in 2022, 52% on secondary roads.
- South Dakota had 4,100 snow-related crashes in 2022-2023 winter.
- Vermont recorded 2,100 icy crashes in 2021-2022, 60% in rural areas.
- North Dakota saw 3,800 winter driving crashes in 2022, 45% involving semis.
- Montana reported 2,900 snow crashes in 2022-2023, 55% on interstates.
- Wyoming had 1,800 winter road crashes in 2021-2022, 67% due to high winds.
- Alaska highways logged 900 winter crashes in 2022, 75% in darkness.
Crash Incidence Interpretation
Driver Behavior and Safety Practices
- 70% of US drivers lack winter tires, per 2023 Michelin survey.
- Speeding causes 13% of winter crashes despite conditions, NHTSA.
- 42% of fatal winter crashes involve unrestrained occupants.
- Distracted driving rises 18% in snow due to wipers/AC adjustments.
- Tailgating accounts for 25% rear-end winter pileups, AAA.
- Only 55% drivers check tire pressure before winter, per AAA poll.
- 31% skip emergency kits, stranding longer in blizzards.
- Alcohol-related winter fatalities up 20% holidays, CDC.
- 65% don't slow for yellow lights in snow, increasing T-bones.
- Phone use doubles crash risk on slick roads, per Virginia Tech.
- 48% ignore bridge ices first signs, per DOT surveys.
- Only 23% practice winter braking techniques yearly.
- Panic braking causes 35% loss of control on ice.
- 72% don't update wiper fluid for freeze protection.
- Fatigue from shoveling/snow doubles drowsy driving 15%.
- 39% follow too close in traffic, per IIHS rear-end study.
- Only 60% use headlights in snow, missing 20% hazards.
- Aggressive lane changes up 22% in plowed conditions.
- 55% don't signal turns in winter, confusing others.
- Kit contents missing in 40%, no blankets/shovels.
- 28% accelerate out of skids instead of steering.
- Holiday rushing increases speed 10 mph average.
- 67% rural drivers skip chains despite mandates.
- Mirror adjustments ignored by 35% in fog/snow.
- 51% don't clear all snow from vehicle before driving.
- Braking too hard common in 44% novice drivers.
Driver Behavior and Safety Practices Interpretation
Fatalities and Injuries
- US winter crashes resulted in 900 fatalities in 2021, with 542 from ice/snow.
- Canada reported 1,200 winter driving deaths from 2018-2022, 30% under 35 years old.
- Michigan winter fatalities reached 112 in 2022-2023, 40% single-vehicle rollovers.
- UK winter road deaths averaged 450 annually 2020-2023, 22% due to ice.
- Norway saw 85 winter fatalities in 2022, 60% from high-speed skids.
- Illinois reported 89 winter driving deaths in 2021-2022, 35% nighttime.
- Sweden had 120 winter fatalities 2019-2023, 45% on untreated roads.
- New York State winter deaths totaled 78 in 2022, 28% multi-vehicle.
- Finland recorded 52 winter fatalities in 2022-2023, 55% rural areas.
- Quebec winter fatalities were 145 in 2022, 25% snow squall related.
- Pennsylvania saw 98 winter deaths in 2021-2022, costing lives in pileups.
- Germany reported 320 winter Autobahn fatalities 2023, 18% of yearly total.
- Wisconsin winter fatalities hit 54 in 2022-2023, 38% evening hours.
- Austria had 92 winter road deaths in 2022, 50% on bridges/overpasses.
- Ohio reported 76 winter fatalities in 2021-2022, 22% commercial trucks.
- Denmark logged 34 winter deaths in 2022-2023, 65% urban slippery roads.
- Minnesota had 62 winter fatalities in 2022, 12% increase from prior.
- Switzerland saw 48 winter deaths in 2022, 72% mountain roads.
- Indiana winter fatalities totaled 51 in 2021-2022, 27% rollovers.
- Scotland reported 29 winter road deaths 2022-2023, 43% unplowed.
- Iowa had 42 winter fatalities in 2022, 36% blizzard conditions.
- Iceland logged 12 winter deaths in 2022-2023, 82% tourists.
- Colorado reported 38 icy fatalities winter 2021-2022.
- Maine had 21 winter deaths in 2022, 54% secondary roads.
- South Dakota saw 27 winter fatalities 2022-2023.
- Vermont recorded 16 winter fatalities 2021-2022, 62% rural.
- North Dakota had 31 winter deaths in 2022, 47% semis involved.
- Montana reported 24 snow fatalities 2022-2023, 57% interstates.
- Wyoming logged 19 winter road deaths 2021-2022, 69% high winds.
- Alaska had 11 winter fatalities in 2022, 77% dark conditions.
- US winter weather crashes injured 418,000 people in 2021.
- 54% of US winter fatal crashes in 2021 involved alcohol impairment.
- Snow and sleet caused 900,000 US crashes yearly, injuring 155,000 severely.
- In 2022, 17,000 US pedestrians injured in winter road incidents.
- Winter black ice led to 25% higher injury rates in crashes per NHTSA 2022 data.
- Canada winter injuries from driving totaled 120,000 annually 2018-2022.
- 35% of Michigan winter injuries in 2022 were head trauma from rollovers.
- UK saw 12,500 winter injury crashes 2020-2023 average.
- Norway winter injuries reached 2,500 in 2022, 55% fractures.
- 42% of Illinois winter injuries in 2021-2022 were back/spine related.
Fatalities and Injuries Interpretation
Road and Weather Conditions
- Snow causes 21% of US weather injuries, per AAA 2023 study.
- Ice-covered roads increase stopping distance by 43% at 20 mph, per NHTSA.
- 26% of US weather crashes occur in snow, 18% in sleet per 2022 data.
- Black ice forms at temperatures between 30-34°F, responsible for 15% surprise skids.
- Snow reduces visibility to under 1/4 mile in 70% of US blizzards.
- Wet snow on roads increases crash risk by 3.7 times vs dry, IIHS 2022.
- Frost on bridges forms 20 times faster than roadways, causing 10% more crashes.
- Sleet reduces tire traction by 30-50%, per AAA foundation tests.
- Canada sees 40 cm average snowfall in winter zones, correlating to 28% crash uptick.
- Michigan averages 50 inches snow yearly, with 22% roads untreated daily.
- UK frost nights average 45 per winter, leading to 12% morning crash spike.
- Norway's -10°C temps freeze roads in 80% of winter days.
- Illinois salt trucks cover 90% interstates, but rural roads lag 40%.
- Sweden plows 95% highways but only 60% local roads in snow.
- New York gets 60 inches snow average, with 35% commute delays.
- Finland's snow depth averages 50 cm, reducing speeds by 20%.
- Quebec blizzards drop visibility to 0 in 15% events, per EC.
- Pennsylvania uses 25 million tons salt yearly, yet 18% re-freeze.
- Germany Autobahns clear snow in 2 hours 85% time, per ADAC.
- Wisconsin -20°F wind chills make roads 4x slicker.
- Austria Alps get 200 inches snow, bridges ice first in 70% cases.
- Ohio averages 28 inches snow, 25% untreated county roads.
- Denmark coastal frost causes 15% more slips vs inland.
- Minnesota snow totals 50 inches, plowing 12 million miles yearly.
- Switzerland passes close 20% days from avalanches/snow.
- Indiana 30 inches snow average, 20% black ice incidents.
- Scotland highlands snow 100 inches, 30% roads impassable.
- Iowa blizzards ground 50% rural roads 3+ days yearly.
- Iceland 80 inches snow, geothermal melts urban 90% faster.
- Colorado mountains 300 inches snow, I-70 closes 10% winter days.
Road and Weather Conditions Interpretation
Vehicle and Tire Performance
- Winter tires reduce stopping distance on ice by 500% vs all-season, per AAA.
- Snow chains increase traction by 400% on packed snow, NHTSA tests.
- All-season tires lose 25-50% grip below 45°F, IIHS data.
- 4WD vehicles skid 20% more on ice than 2WD with winter tires.
- ABS brakes shorten ice stops by 30%, but require winter tires.
- Studded tires banned in 37 US states but legal ones cut crashes 25% where allowed.
- Battery capacity drops 40% at 0°F, stranding 12% winter drivers.
- Windshield washer fluid freezes at 20°F unless -20 rated, causing 8% visibility crashes.
- Engine oil thickens 2x below 32°F, slowing starts by 15%.
- Wiper blades harden and crack at -10°F, failing 22% in snow.
- Coolant antifreeze must be 50/50 mix to -34°F, else blocks 10% engines.
- Fuel lines gel at 10°F in diesel without additives, stopping 18% trucks.
- Tire pressure drops 1 PSI per 10°F, reducing traction 15%.
- Heated seats/mirrors reduce fog by 60%, per SAE study.
- Roof racks add 5% drag in wind, worsening control 12%.
- EV range drops 41% at 20°F vs 70°F, AAA tests.
- Brake pads wear 2x faster on salted roads, per Tire Rack.
- All-wheel drive improves snow accel by 25% but not stopping.
- Snow tires with 3PMSF symbol grip 50% better on ice.
- Defroster clears ice 40% faster with 70% alcohol mix.
- Suspension lowers 1 inch from snow weight, altering handling 10%.
- Headlight lenses fog 30% more in cold, reducing range 20%.
- Radiator fins clog with salt 25% faster, overheating 7% vehicles.
- Gas tanks under 1/4 full freeze lines 15% more often.
- Alloy wheels corrode 3x faster from road salt exposure.
- Cabin air filters clog with snow 40% quicker, fogging windows.
- Transmission fluid gels at 0°F without winter grade, slipping 12%.
Vehicle and Tire Performance Interpretation
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