The “But I Was Doing the Speed Limit!” Defense (And Why It Fails)
As an Illinois personal injury lawyer, I hear it all the time. A client or a defendant says, “I don’t understand why I’m being blamed; the sign said 55, and I was doing 55.”
In the eyes of Illinois law, that sign is a maximum, not a guaranteed safe harbor. Under 625 ILCS 5/11-601, the state imposes a constant “duty of due care” that requires you to adjust your speed based on reality, not just the number on a post.
If you’ve been injured in an accident where the other driver was “technically” following the speed limit but clearly driving too fast for conditions, here is what you need to know about liability.
Understanding 625 ILCS 5/11-601
The Illinois Vehicle Code is very specific about this. Subsection (a) of the statute states:
- “Speed must be decreased as may be necessary to avoid colliding with any person or vehicle on or entering the highway in compliance with legal requirements and the duty of all persons to use due care.”
- Essentially, the law says you must drive at a speed that is reasonable and proper given the current conditions. If you are driving 65 mph during a blinding Lake Michigan “lake effect” snowstorm, you are likely violating the law—even if the speed limit is 70 mph.
When “The Limit” Is Too Fast
Here are several scenarios where a driver is legally required to slow down below the posted limit:
- Weather Conditions: Rain, ice, snow, or fog that reduces traction or visibility.
- Road Hazards: Potholes, construction zones, or debris.
- Winding or Narrow Roads: Physics doesn’t care about the speed limit; if a curve is sharp, you must slow down to maintain control.
- Pedestrians and Intersections: Approaching a crosswalk or a busy intersection requires a heightened level of “due care.”
- Visibility Issues: Driving into a direct sunset or through heavy smoke.
How This Affects Your Personal Injury Claim
In a personal injury lawsuit, the burden is on the plaintiff (the injured party) to prove that the other driver was negligent.
In Illinois, the violation of a statute intended to protect human life—like 625 ILCS 5/11-601—is considered prima facie evidence of negligence. .
The “Failure to Reduce Speed” Trap
Many drivers receive a citation for “Failure to Reduce Speed to Avoid an Accident.” While a traffic ticket isn’t an automatic “win” for your civil case, it is a powerful piece of evidence. It shows that a responding officer determined the driver’s speed was inappropriate for the circumstances, regardless of the posted limit.
The Bottom Line: Don’t let an insurance adjuster tell you that their client isn’t at fault just because they weren’t “speeding.” If they weren’t driving for the conditions, they were breaking the law.