What Are the Top Causes of Car Accidents in Chicago?

Key Takeaways

• Distracted driving, speeding, impaired driving, following too closely, and failure to yield are common factors in Chicago crashes.
• Each behavior may violate the Illinois Vehicle Code and can serve as evidence of negligence when it contributes to a crash.
• You can recover damages if your share of fault is 50% or less, and nothing above that line.
• Most Illinois injury lawsuits must be filed within two years of the crash date.

The top causes of car accidents in Chicago are distraction, speeding, impairment, tailgating, and failure to yield. Those behaviors are more than bad habits. Each behavior may violate a specific provision of the Illinois Vehicle Code, and that violation can serve as evidence of negligence when it contributed to the crash.

If your car is sitting in a body shop and an adjuster keeps calling every afternoon, that confusion makes sense. The cause an insurance company assigns to your collision can affect how much fault it tries to place on you and how it values your claim, and its first phone call is rarely a neutral fact-finding exercise.

At Conboy Law, we examine what the physical evidence shows rather than accepting the first explanation offered, and you can call our team to talk through what happened.

How Illinois Law Turns a Crash Cause Into a Legal Claim

Naming the cause of a collision is not trivial. It is how fault gets assigned, and fault determines who pays for medical expenses, lost wages, and pain and suffering.

Adjusters reach their own conclusions quickly, often before anyone pulls camera footage or vehicle data. Our attorneys treat that early conclusion as an opening position rather than a finding.

Negligence and Proximate Cause

Negligence means a driver failed to use reasonable care. An injured person must establish four things: A duty of care existed, the other driver breached that duty, the breach caused the collision, and real losses followed.

Proximate cause is the link between the breach and the harm. A driver who looks down at a text near Ashland and Division, drifts through a crosswalk, and strikes a pedestrian has created that link plainly.

When Breaking a Traffic Law Signals Fault

A traffic citation does not establish civil liability by itself. Depending on how the traffic case is resolved, evidence such as a guilty plea may be relevant in a later injury case. What matters more is how Illinois divides responsibility when both drivers made mistakes.

Illinois follows a modified comparative fault rule set out in 735 ILCS 5/2-1116. An injured person recovers nothing if their share of fault is more than 50%, and damages are reduced in proportion to fault at 50% or less.

That threshold explains why an insurer works so hard to move a few percentage points onto you. Every point it shifts is money it does not pay.

How Distracted Driving Causes Chicago Car Accidents

Phones are the obvious culprit, though the legal definition of distraction reaches further than most drivers expect.

Illinois prohibits operating a vehicle on a roadway while using an electronic communication device, and the statute expressly names streaming video, video conferencing platforms, and social media access in 625 ILCS 5/12-610.2. When the violation is a proximate cause of a crash resulting in great bodily harm, permanent disability, disfigurement, or death, it can constitute aggravated use of an electronic communication device.

The statute reaches several behaviors drivers often assume are permitted:

• Watching or streaming video on a phone or tablet while driving
• Joining a video call on a work application from behind the wheel
• Opening a social media app while stopped at a red light
• Dialing a full phone number by hand rather than pressing a single button

Hands-free operation remains an exception for voice calls, but it offers no protection for video or social media use.

Dense traffic magnifies the danger. On a crowded arterial street, a two-second glance at a screen covers most of a city block, and a driver who looks up late has no room left to brake.

Proving distraction takes more than suspicion. We request phone records, infotainment system data, and nearby camera footage to establish what a driver was doing in the seconds before impact.

Speeding and Driving Too Fast for Conditions

Speed appears in two separate legal failures, and only one of them involves a posted sign.

The 30 Mile-Per-Hour Default and the Alley Rule

Unless another restriction applies, the maximum speed limit in an urban district is 30 miles per hour, and 15 miles per hour in an alley, according to 625 ILCS 5/11-601. The same section adds that staying under the posted limit does not relieve a driver of the duty to decrease speed when approaching an intersection, rounding a curve, or facing hazardous weather.

That second rule matters enormously in a dense city. A driver traveling 28 miles per hour through a snow squall on Western Avenue may still be driving too fast for conditions.

Impaired Driving Crashes

Alcohol and drug impairment remains among the most destructive causes on any roadway, and the resulting collisions are rarely minor.

Illinois prohibits driving with an alcohol concentration of 0.08 or more under 625 ILCS 5/11-501. The same section separately prohibits driving under the influence of drugs or intoxicating compounds to a degree that makes safe driving impossible.

Prosecutors handle any criminal case against an impaired driver separately from your injury claim. A conviction is not required before an injured person pursues a civil claim, and an acquittal does not end one.

For an injured person, the civil side is what matters. Conboy Law pursues the compensation available through the at-fault driver's insurance and through any other responsible party. We also look for commercial policies and employer liability that an individual policy alone would not reach.

If another driver's choices left you hurt, you do not have to work out the cause on your own. Call 312-726-9000 to talk with our team about what happened and what options may be open to you.

Following Too Closely and Rear-End Collisions

Stop-and-go traffic on the Dan Ryan produces rear-end collisions daily, and tailgating is usually the reason.

Illinois traffic law requires drivers to leave a following distance that is reasonable and prudent for the speed, traffic, and condition of the road. The Secretary of State's Rules of the Road recommends a three-second gap, widened further when weather or pavement is poor.

Fault in a rear-end crash often lands on the trailing driver, but that outcome is not automatic. Brake light failures, abrupt lane changes, and unexpected braking by driver-assistance systems can each shift the analysis.

Injuries from these collisions often surface a day or two later. Neck and back symptoms that feel minor at the scene can develop into something that keeps you off work, and a gap in the medical record gives an insurer an argument. Prompt evaluation protects your health and the evidence at the same time.

Failure to Yield at Chicago Intersections

Intersections concentrate risk because they force drivers to judge gaps, speeds, and right-of-way in a second or less.

Left-Turn Collisions

A driver turning left within an intersection or into an alley, private road, or driveway must yield to oncoming traffic close enough to be an immediate hazard, as 625 ILCS 5/11-902 requires. Left-turn crashes tend to strike the passenger compartment directly, which is why injuries in these collisions are often severe. 

The turning driver frequently claims the oncoming vehicle was speeding, turning the case into a dispute over closing distance and reaction time.

Red-Light and Stop-Sign Violations

A driver who enters against a signal usually strikes the side of a vehicle that has the right of way. These T-bone impacts leave very little crush space between an occupant and the striking vehicle.

Evidence in intersection cases fades quickly. Business security cameras overwrite footage within days, and independent witnesses scatter before anyone writes down a name. A preservation request sent in the first week often decides whether a case rests on video of the impact or on two drivers' conflicting memories.

How We Prove What Caused Your Chicago Crash

Cause is established with records, not arguments. The work starts while the evidence still exists.

Preserving proof follows a rough order of urgency:

1. Photograph vehicle positions, debris, skid marks, and roadway conditions before anything is moved.
2. Collect contact information for every witness, including passengers in the other vehicles.
3. Seek medical evaluation promptly so the record connects your injuries to the collision.
4. Send preservation letters to businesses and agencies holding relevant camera footage.
5. Request event data recorder downloads before a vehicle is repaired or salvaged.

Acting quickly on those steps protects options that otherwise disappear on their own.

Beyond the basics, Conboy Law pursues evidence sources that most people never think to request:

• Signal timing records from the city for intersection collisions
• Cellular records and infotainment logs showing device activity
• Commercial vehicle telematics and hours-of-service logs
• Roadway maintenance records where pavement or signage played a role

Each source can move the fault percentage, and under state law every percentage point changes what you may recover. A shift from 40% fault down to 20% is not a technicality, and it changes what a claim is worth by a meaningful margin.

Timing governs all of it. Most Illinois injury lawsuits must be filed within two years of the date the claim accrued, under 735 ILCS 5/13-202.

Frequently Asked Questions About Chicago Car Accident Causes

Talk With a Chicago Car Accident Lawyer at Conboy Law About What Caused Your Crash

Being blamed for a crash you did not cause can make an already difficult situation more stressful. At Conboy Law, we review the available evidence, explain how Illinois law may apply, and help you understand your options.

You do not have to give the other driver’s insurer a recorded statement before speaking with an attorney. If another driver’s negligence injured you in Chicago, contact Conboy Law at 312-726-9000 for a free case evaluation.