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Proving Fault in an Illinois Head-On Collision: What the Evidence Actually Shows

Sun 22 Feb, 2026 / by / Car Accidents

Last Updated: October 31, 2026

Lane position at impact is a fact. 735 ILCS 5/2-1116 uses that fact in measuring the injured person’s own share. The section does not assign fault because of the type of crash alone.

Fault Evidence and the Injured Person’s Share

735 ILCS 5/2-1116 diminishes damages when the plaintiff’s contributory fault is not more than 50 percent of the proximate cause, and it bars recovery when that share is more than 50 percent. The source is P.A. 103-1053, effective December 20, 2024. The section does not assign fault to one driver because that driver crossed a center line.

Photographs, marks on the pavement, and the location of the vehicles can be used to prove where the impact occurred. Those facts may also bear on the injured person’s own share of the proximate cause under section 2-1116.

Lane Position and the Scene

In a head-on crash, investigators often ask which vehicle left its lane and where contact began relative to the center line. NHTSA describes crash investigations that combine scene marks, vehicle inspections, photographs, interviews, and records. The point of impact and final resting positions are distinct parts of that reconstruction.

Witness statements and available video, including dash cameras or fixed cameras, may also bear on lane position and speed. Compare them with the scene and vehicle evidence; the weight of the evidence depends on the facts of the crash.

Preserving Vehicles and Scene Evidence

Scene markings, weather, and road conditions can change after the crash. Photographs and measurements taken while conditions remain may preserve facts that later change. Vehicles may be repaired, sold, or scrapped, which can affect later inspection.

Identify who has the vehicles, photographs, video, and electronic records so counsel can address preservation before relevant material is lost through ordinary use or disposal. A written request can identify what should be preserved; whether a legal duty exists and what consequences follow from a loss require a separate assessment of the facts and applicable law.

Event Data and Electronic Records

An event data recorder stores limited technical information around a crash, rather than audio or video. For covered vehicles equipped with an EDR, 49 CFR 563.7 specifies data such as indicated speed, throttle, and brake status. Steering input is conditional if recorded; do not assume every vehicle captured it or that it proves a lane departure.

The actual recording must be assessed for the particular vehicle and event by someone qualified to retrieve and interpret it. Under 49 CFR 563.9, covered air-bag-deployment event data must be locked against overwriting, while certain non-deployment events may be overwritten or not recorded when the buffers are full. That is different from a universal rule that starting the engine erases the crash record.

Access and admissibility are separate questions. The federal Driver Privacy Act of 2015, section 24302, places ownership with the owner or lessee and restricts access by others, with exceptions that include consent or authorization from a court or other specified authority. Obtaining data does not by itself establish that it will be admitted as evidence.

Frequently Asked Questions

Can the injured person recover if that person bears part of the fault?

Yes, when that share is not more than 50 percent of the proximate cause. The damages are then diminished by that share. A share above 50 percent bars recovery.

Does a rear-end collision carry a presumption of fault?

A rear-end impact does not automatically establish negligence as a matter of law. Rettig v. Heiser, 2013 IL App (4th) 120985, paragraphs 32-34, discusses that distinction. A fact finder may still reasonably infer negligence from the evidence, as illustrated in Perez v. K & B Transportation, No. 19-2984 (7th Cir. July 24, 2020), pages 8-10. Section 2-1116 addresses the injured person’s contributory share; it does not replace that evidence inquiry.

Does a speed within the posted limit end the inquiry?

625 ILCS 5/11-601(a) provides that no vehicle may be driven on a highway of this State at a speed greater than is reasonable and proper with regard to traffic conditions and the use of the highway, or that endangers any person or property. A speed within the applicable maximum does not relieve the duty to decrease speed when a special hazard exists by reason of weather or highway conditions, or with respect to other traffic. The source is P.A. 104-787, effective August 7, 2026. The section does not name a feet-per-second figure.

When does section 13-202 require the action to be filed?

735 ILCS 5/13-202 requires the actions it covers to be commenced within 2 years next after the cause of action accrued. That two-year sentence does not cover damages resulting from first-degree murder or a Class X felony when the perpetrator is convicted of that crime. The source is P.A. 99-90, effective January 1, 2016. 735 ILCS 5/13-211(a) lets a person who was under 18 when a cause specified in sections 13-201 through 13-210 accrued bring the action within 2 years after attaining 18. That subsection does not state a general delayed-discovery exception.

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