Chicago logged 112,055 traffic crashes in 2024 and 109,112 in 2025.12 The pace hasn't eased in 2026, with 9,461 crashes recorded in January alone.3 Most of those are low-speed events: parked-car scrapes and rear-end taps in stop-and-go traffic. A smaller set does most of the serious harm. Three crash types account for a large share of the deaths and disabling injuries: the T-bone that catches your door, the head-on, and the rollover. Where each one happens in Chicago is not random. It tracks with how a road is built and how fast people drive it.
Here is the 2024 split from the City of Chicago's own crash records: 12,401 angle (T-bone) crashes, 926 head-on crashes, and 65 rollovers.4 Angle crashes alone were about one in nine of every reported crash. Head-ons and rollovers were rare by comparison, yet they injure and kill at a far higher rate per crash, which is why they deserve to be pulled out and looked at on their own.
T-bone crashes and the arterial grid
A T-bone, or angle crash, is a side impact: one vehicle hits the side of another, usually because someone ran a red light, misjudged a gap, or turned across oncoming traffic. In a city laid out on a signalized grid, these concentrate at intersections along the wide north-south and east-west arterials.
The City's 2024 data shows exactly where. Western Avenue recorded the most angle crashes of any street at 261, followed by Ashland Avenue and Halsted Street at 245 each, Pulaski Road at 243, and Kedzie Avenue at 226.4 Cicero Avenue (181), Damen Avenue (171), and Stony Island Avenue (137) were close behind.4 Those names are not a surprise. Four of them, Western, Ashland, Pulaski, and Cicero, are on the City's Vision Zero list of High Crash Corridors. Chicago used crash data to flag 43 such corridors and eight High Crash Areas, and seven of the eight areas sit on the West and South Side.5
Angle crashes are common, and they do real damage. In 2024 they were tied to 21 deaths and 335 serious, or incapacitating, injuries across the city.4 The reason a T-bone hurts so badly is geometry. The side of a car has far less crush space than the front, so the striking vehicle's force lands almost directly on the person sitting there.
Head-on crashes are rarer, and much deadlier
Head-on crashes were fewer than 1 percent of Chicago crashes in 2024, just 926 of them, but they killed 7 people and seriously injured 76.4 That works out to a fatality rate several times higher than an angle crash. Statewide the gap is even wider. Illinois recorded 2,682 front-to-front crashes in 2023, and those crashes caused 138 deaths, one of the highest death counts of any collision type even though it is one of the least common.6
Within the city, head-ons cluster on undivided two-way arterials where only a painted line separates opposing traffic. Kedzie Avenue and Pulaski Road led in 2024 with 25 head-on crashes each, followed by Western Avenue (24), Cicero Avenue (20), Ashland Avenue (18), and Grand Avenue (17).4 These are the same wide, fast streets that top the angle list. The overlap makes sense, because speed and heavy left-turn traffic feed both crash types.
The expressways are a different world. Wrong-way and crossover head-ons on the Dan Ryan, Kennedy, and Eisenhower are worked by the Illinois State Police rather than the Chicago Police, so most never enter the City's street dataset. They land instead in IDOT's statewide numbers, where Cook County by itself saw 160,036 crashes and 356 fatal crashes in 2023.6
Rollovers are uncommon here, but they kill out of proportion
Rollovers barely register in the raw Chicago counts: 65 in 2024 and 56 in 2025.4 A dense city with low speeds and few embankments simply doesn't produce many. National data explains why they still matter. Rollovers were 28 percent of all passenger-vehicle occupant deaths in 2023, according to NHTSA, despite being a small slice of crashes.7 Illinois mirrors that: 2,773 overturned crashes in 2023 caused 61 deaths, again a fatality rate several times the average across all crash types.6 Tall, top-heavy vehicles are the ones that tip. Among passenger-vehicle occupants killed in 2023, a rollover was involved in 38 percent of pickup deaths and 33 percent of SUV deaths, against 20 percent for cars.7
So where do they happen in a flat city? Where speed meets a curve. The clearest local case is the Oak Street S-curve on DuSable Lake Shore Drive, a sharp bend posted at 25 mph that has been a loss-of-control spot for decades. In 2020 that one curve saw 199 crashes, one death, and 32 injuries, and it kept hurting people even as crashes citywide dropped.8 IDOT's long-running Redefine the Drive plan would soften the curve and widen the lanes. Ramps and interchanges are the other setting where a fast, tired, or impaired driver can put a vehicle on its side, including the Jane Byrne Interchange where the Dan Ryan, Kennedy, and Eisenhower tie together.
Where these numbers come from
Two systems count Chicago crashes, and they don't line up cleanly. Crashes on city streets are reported by the Chicago Police Department and published in the City's open Traffic Crashes dataset, which is the source for the corridor and crash-type figures above.4 Crashes on the expressways are handled by the Illinois State Police and roll up into IDOT's statewide Crash Facts.6 If you were hit on Western Avenue, your crash is in the first system. If you were hit on the Kennedy, it is in the second. That distinction matters when you go to pull the report, because you are asking a different agency.
After a T-bone, head-on, or rollover
These three crash types share a few things: they tend to cause serious injuries, fault is often disputed, and insurers get involved fast. If you can, get the crash report number before you leave the scene, photograph where the vehicles ended up, and get checked by a doctor even if you feel okay, because side-impact and rollover injuries often surface a day later. If the other driver ran a light, crossed the center line, or was speeding, fault may be clearer than it feels right now. When you need help with a claim or a serious-injury case, you can find an attorney through the thatcarhitme.com legal directory.
This article is general information, not legal advice.
Sources
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City of Chicago year-over-year crash report, 2024 total (thatcarhitme.com crash data). https://thatcarhitme.com/crash-data/illinois/chicago/2024-annual-report
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Chicago year-over-year crash report, 2025 vs 2024 (thatcarhitme.com crash data). https://thatcarhitme.com/crash-data/illinois/chicago/2025-annual-report
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Chicago crash report, January 2026 (thatcarhitme.com crash data). https://thatcarhitme.com/crash-data/illinois/chicago/january-2026-report
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City of Chicago Open Data, Traffic Crashes - Crashes dataset (Chicago Police Department). https://data.cityofchicago.org/Transportation/Traffic-Crashes-Crashes/85ca-t3if
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City of Chicago, Vision Zero Chicago Action Plan announcement, June 2017. https://www.chicago.gov/city/en/depts/mayor/press_room/press_releases/2017/june/VisionZero.html
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Illinois Department of Transportation, 2023 Illinois Crash Facts & Statistics (Crashes by Type of Collision; County Motor Vehicle Crash Statistics). https://idot.illinois.gov/content/dam/soi/en/web/idot/documents/transportation-system/resources/safety/crash-reports/crash-facts/2023_crash_facts.pdf
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NHTSA, Traffic Safety Facts, Passenger Vehicles: 2023 Data (DOT HS 813 723). https://crashstats.nhtsa.dot.gov/Api/Public/ViewPublication/813723.pdf
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CBS Chicago, "Despite Fewer Crashes Citywide, Oak Street S-Curve On Lake Shore Drive Remains Dangerous As Ever." https://www.cbsnews.com/chicago/news/lake-shore-drive-oak-street-s-curve-dangers/