Last Clear Chance Doctrine

The last clear chance doctrine is a counter-defense to contributory negligence. Under traditional contributory negligence rules, any negligence by the plaintiff completely bars recovery. The last clear chance doctrine softens this harsh result by allowing a contributorily negligent plaintiff to recover if the defendant had the last clear chance to avoid the accident but failed to take it.

The doctrine originated in Davies v. Mann (1842), the "donkey case," where the plaintiff negligently left his donkey fettered in the road and the defendant drove a wagon over it. The court held that the defendant's negligence in failing to avoid the donkey — despite having the opportunity to do so — was the proximate cause of the harm, and the plaintiff's earlier negligence did not bar recovery.

The doctrine comes in several variations depending on the plaintiff's situation. When the plaintiff is in a position of "helpless peril" — unable to extricate themselves from danger — the defendant is liable if they knew or should have known of the plaintiff's predicament and could have avoided the harm. When the plaintiff is in a position of "inattentive peril" — able to avoid harm but unaware of the danger — the defendant is liable only if they actually knew of the plaintiff's danger and failed to exercise reasonable care.

The last clear chance doctrine has declined in importance with the widespread adoption of comparative negligence, which proportionally allocates fault between the parties. In comparative negligence jurisdictions, the doctrine is generally subsumed into the overall fault allocation. However, it remains relevant in the few jurisdictions that still follow contributory negligence and appears on exams as a historical and analytical concept.

On exams, last clear chance should be considered whenever contributory negligence is at issue and the defendant had a subsequent opportunity to prevent the harm.