In 2024, Chicago recorded 112,055 traffic crashes.1 Most people involved walked away. A smaller group did not. That year 25,582 people were injured in city crashes and 123 were killed.1 The distance between those two outcomes often comes down to what happens in the first hour and to which hospital the ambulance chooses.
For anyone who has just been in a wreck, the medical side moves fast and the choices get made for you. Knowing how that system works helps you make sense of the bills, the records, and the recovery that follow.
How Chicago EMS decides where you go
When paramedics reach a wreck, they run a four-step check before deciding where to drive. Region XI, the EMS system that covers Chicago, calls it trauma field triage, and it runs in order: the patient's vitals, then the anatomy of the injury, then the mechanism of the crash, then special considerations like age or blood thinners.2
Step one is the patient's vitals. A Glasgow Coma Scale of 13 or lower, a systolic blood pressure at or below 100, or a breathing rate under 10 or over 29 sends an adult straight to a trauma center.2 Step two is the injury itself: penetrating wounds to the head, neck or torso, two or more broken long bones, a crushed or mangled limb, and an open skull fracture all trigger trauma transport.2
Step three is about how the crash happened, because some wrecks are dangerous even when the patient seems steady. Ejection from the vehicle, a death in the same passenger compartment, a roof or occupant-space intrusion of more than a foot, or a pedestrian or cyclist run over at more than 20 mph all route a patient to trauma care on mechanism alone.2
The core rule is blunt. Region XI defines an adult trauma patient as anyone 16 or older, and those patients go to the closest Level I trauma center, with scene time kept to a minimum.2 Children 15 and under are taken to a pediatric Level I center when one is within about 25 minutes; past that, they go to the nearest Level I.2
The hospitals that take the worst wrecks
Chicago's severe injuries land at a short list of hospitals. Region XI's Level I adult trauma centers include John H. Stroger Jr. Hospital of Cook County, Northwestern Memorial, Mount Sinai, Advocate Illinois Masonic, Advocate Christ Medical Center in Oak Lawn, Advocate Lutheran General, Loyola University Medical Center, and Saint Francis in Evanston.2 Pediatric Level I care runs through Stroger, Lurie Children's, and Comer Children's at the University of Chicago.2 The Illinois Department of Public Health is the agency that designates each center.3
For decades that map had a hole in it. The South Side went 27 years without an adult trauma center after Michael Reese Hospital ended its trauma program in 1991.4 Someone badly hurt in those neighborhoods had to be driven miles north or west while the clock ran. UChicago Medicine opened a Level I adult trauma center on May 1, 2018, and closed the gap.4
The distance was never abstract. A study in the American Journal of Public Health tracked 11,744 Chicago gunshot patients and found that the 4,782 who were wounded more than five miles from a trauma center had longer transport times and higher death rates; being outside that five-mile ring raised the odds of dying by about 23%.5 The authors named the underserved stretches "trauma deserts."5 It's the same math behind the EMS rule to reach the nearest Level I fast.
The roads that fill the trauma bays
Crashes don't spread evenly across Chicago. In 2024 more collisions happened on Western Avenue, which runs nearly the full length of the city, than on any other street: 3,105, ahead of Pulaski Road (2,755), Cicero Avenue (2,585), and Ashland Avenue (2,455).6 Narrow the count to the crashes that actually hurt people, the fatal and incapacitating ones, and the order barely moves. Western led again with 51, then Cicero and Pulaski at 43 apiece and Ashland at 42.6
Those are the same corridors the city keeps targeting. Chicago's Vision Zero plan identified 43 High Crash Corridors across 70 miles of major streets, plus 8 High Crash Areas that carry outsized shares of deaths and serious injuries, most of them on the West and South Sides.7 The Chicago Department of Transportation set a goal of ending traffic deaths and serious injuries by 2026, and its own analysis found that almost 72% of fatal Chicago crashes involve one of five dangerous driving behaviors, speeding among them.7
Pedestrians and cyclists show up out of proportion to their numbers. Chicago recorded 3,073 crashes involving pedestrians and 2,301 involving cyclists in 2024, and 34 pedestrians were killed.1 Those are exactly the patients the mechanism-of-injury step is built to catch.
What a "serious injury" actually means
Not every crash injury is a trauma-center injury. Of Chicago's 112,055 crashes in 2024, about 83% produced no injury at all.1 But 1,628 crashes caused what Illinois calls an A-injury, the incapacitating kind: severe lacerations, broken limbs, skull or chest injuries, and internal abdominal damage.18 Another 9,968 crashes caused lesser but real injuries.1 The statewide picture matched it, with 8,124 A-injuries and 1,178 people killed across 303,913 Illinois crashes in 2024.8
The causes are consistent. Failing to yield the right of way was the leading contributing factor in Chicago crashes in 2024, cited in 13,066 of them, followed by following too closely at 9,776.1 Hit-and-run drivers were involved in 34,375 crashes, close to a third of the total.1 The volume isn't easing much either: the city logged 109,112 crashes in 2025 and 9,461 in January 2026 alone.910
After the emergency room
A trauma admission starts a paper trail that matters later. Ask for your ambulance run sheet, your ER records, and your imaging reports, and keep them with the official crash report.1 Illinois treats an incapacitating injury as its own category for a reason: it's the one that keeps people out of work and in follow-up care for months.8 If the medical bills and the insurance response start to outrun what you can manage alone, you can compare local options through the thatcarhitme.com legal directory.
This article is general information, not legal advice.
Sources
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ThatCarHitMe.com, Chicago 2024 Annual Crash Report. https://thatcarhitme.com/crash-data/illinois/chicago/2024-annual-report
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Chicago EMS System (Region XI), Trauma Patient Triage and Transport policy. https://chicagoems.org/wp-content/uploads/sites/2/2017/08/Trauma-Patient-Transport_with-algorithm.pdf
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Illinois Department of Public Health, Trauma Program. https://dph.illinois.gov/topics-services/emergency-preparedness-response/ems/trauma-program.html
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UChicago Medicine, "UChicago Medicine gets approval to be a Level 1 adult trauma center." https://www.uchicagomedicine.org/forefront/trauma-articles/uchicago-medicine-gets-approval-to-be-a-level-1-trauma-center
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Crandall M, Sharp D, Unger E, et al. "Trauma deserts: distance from a trauma center, transport times, and mortality from gunshot wounds in Chicago." American Journal of Public Health, 2013;103(6):1103-1109. https://pubmed.ncbi.nlm.nih.gov/23597339/
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City of Chicago, Traffic Crashes - Crashes dataset, Chicago Data Portal (dataset 85ca-t3if). https://data.cityofchicago.org/Transportation/Traffic-Crashes-Crashes/85ca-t3if
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Vision Zero Chicago, Chicago Department of Transportation. https://nacto.org/wp-content/uploads/Chicago.pdf
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Illinois Department of Transportation, 2024 Illinois Crash Facts & Statistics. https://idot.illinois.gov/content/dam/soi/en/web/idot/documents/transportation-system/resources/safety/crash-reports/crash-facts/2024-crash-facts.pdf
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ThatCarHitMe.com, Chicago 2025 Annual Crash Report. https://thatcarhitme.com/crash-data/illinois/chicago/2025-annual-report
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ThatCarHitMe.com, Chicago January 2026 Crash Report. https://thatcarhitme.com/crash-data/illinois/chicago/january-2026-report