Also known as: radii of danger · zone of danger
Written by attorneys · grounded in primary & secondary sources — see below
A spatial boundary in negligence law that limits the class of plaintiffs to whom a defendant owes a duty of care. The boundary encompasses those persons whom a reasonable actor would foresee as being at risk of injury from the defendant's conduct. Plaintiffs outside this boundary are unforeseeable and therefore owed no duty.
River Culinary's staff ignored repeated complaints about Frankie pacing and shouting near the restrooms. Earl entered solely to use the restroom and was attacked there by Frankie. Earl sued for negligence. Because the complaints identified a localized risk to restroom users, Earl stood inside the radius of danger created by the known conduct. The court therefore held that River Culinary owed Earl a duty of care.
Consolidated Rail's tank car leaked a toxic chemical near People Express's terminal. The airline suffered economic losses when it evacuated the facility. People Express sued for negligence. Because the spill created a foreseeable risk of harm to nearby commercial operations, the airline stood inside the radius of danger. The court therefore found that Consolidated Rail owed People Express a duty of care.
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A driver struck a child in a crosswalk while the child's mother watched from the curb. The mother suffered emotional distress and sued for negligence. Because the mother stood in immediate proximity to the accident scene, she remained inside the radius of danger created by the driver's conduct. The court therefore held that the driver owed the mother a duty of care.
The radius of danger confines the defendant's duty to those plaintiffs a reasonable person would foresee as being at risk from the negligent conduct. A plaintiff outside that boundary is unforeseeable and therefore owed no duty even if injury occurs.
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Physical proximity matters only when it makes the risk of injury to that plaintiff reasonably foreseeable at the time of the negligent act. Courts examine whether a reasonable person in the defendant's position would have anticipated harm to someone situated like the plaintiff.
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Yes when the known risk is localized to a specific area and the plaintiff is injured in that precise location. The alignment between the reported danger and the site of injury renders the plaintiff foreseeable despite lacking customer status.
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…trauma caused by the defendant's negligence only if the plaintiff were present at the scene of the accident and were in the zone of danger, is an artificial and unrealistically restrictive barrier. We shall explain that the availability of a cause of action for emotional trauma should turn on the defendant's breach of a duty…