How to Prove Another Driver’s Liability for Running a Red Light in Wisconsin

The information on this site is for general informational purposes only, may be outdated, and is not legal advice; do not rely on it without consulting your own attorney. See full disclaimer.

Disclaimer: This article is for informational purposes only and does not constitute legal advice. Consult an attorney to discuss the specifics of your case.

Detailed Answer

When a driver runs a red light and causes a crash, Wisconsin law provides tools to establish their liability. You must prove four elements of negligence: duty, breach, causation and damages. In many cases, violating a traffic signal triggers negligence per se, shifting the burden to the at-fault driver to justify the violation.

1. Negligence Per Se via Traffic Signal Violation

Wisconsin Statute §346.37(1)(c) makes it unlawful to enter an intersection on a red signal. Viewing that violation as negligence per se means:

  • The statute defines the standard of care.
  • Proving the driver ran the red light satisfies breach of duty.
  • The at-fault driver must then offer a legal excuse for the violation.

Link to statute: Wis. Stat. §346.37(1)(c).

2. Elements of a Negligence Claim

  1. Duty: Every driver must obey traffic signals.
  2. Breach: Running the red light violates that duty.
  3. Causation: The breach must directly cause the collision.
  4. Damages: You must have suffered compensable harm (medical bills, vehicle damage, pain and suffering).

3. Gathering Evidence

  • Police report documenting signal violation and crash details.
  • Traffic-camera or red-light-camera footage.
  • Eyewitness statements describing the sequence of events.
  • Photographs of the scene, skid marks and vehicle damage.
  • Accident reconstruction or expert testimony, if needed.

4. Comparative Fault in Wisconsin

Wisconsin follows a pure comparative negligence rule. Under Wis. Stat. §895.045, you can recover damages even if you share fault. Your recovery is reduced by your percentage of fault.

Link to statute: Wis. Stat. §895.045.

Helpful Hints

  • Call the police immediately and request a crash report.
  • Preserve all evidence: photos, videos and documents.
  • Get contact information for witnesses at the scene.
  • Seek medical attention promptly and keep records of treatment.
  • Consult a qualified attorney early to understand your rights.

The information on this site is for general informational purposes only, may be outdated, and is not legal advice; do not rely on it without consulting your own attorney. See full disclaimer.