The Reasonably Prudent Person: Fix the Comparator Before Judging Conduct
The reasonably prudent person standard asks what a reasonable actor with the defendant’s relevant circumstances would have done at the time of the conduct. It is an objective comparison, not an inquiry into whether this defendant honestly tried, lacked confidence, or believed the conduct was safe.
Run the analysis in this order:
- Identify the actor and the exact conduct. Judge the decision when it was made, not the entire course of events after the injury.
- Reconstruct the circumstances. Include facts the actor knew or reasonably should have known, the time and place, the apparent danger, available alternatives, and any urgency.
- Select the correct comparator. Begin with the ordinary reasonable adult, then ask whether a child, physical disability, professional role, or qualifying emergency changes the standard.
- Compare the conduct with that comparator. The question is whether the selected reasonable actor would have taken the precaution or chosen the alternative under those circumstances.
- Separate unreasonable conduct from a bad outcome. An accident does not itself establish breach, and reasonable care does not require the safest imaginable choice.
The ordinary adult comparator includes the actor’s actual knowledge and superior skill. A person who knows that a bridge is icy, understands a specialized instrument, or has learned of a particular danger must act as a reasonable person with that knowledge. By contrast, the comparator does not ordinarily adjust downward for poor judgment, inexperience, forgetfulness, or a mistaken belief that a precaution was unnecessary.
The standard is objective but circumstance-sensitive. “Reasonable person” does not mean a person in ordinary conditions. It means a reasonable person placed in the same relevant conditions. Hindsight is excluded: the fact that the danger became obvious after the event does not make it obvious before the event.
This is a closed-book topic: memorize the baseline comparator and every special-standard trigger and consequence.
Special Actors: Age, Impairment, and Professional Skill
The crucial near-miss is between a changed comparator and an unchanged comparator. A physical disability changes the hypothetical person; mental impairment and voluntary intoxication generally do not. A child receives a child comparator unless the child undertakes an adult activity; a professional receives a professional comparator rather than an ordinary-person comparator.
| Actor or situation | Governing comparator | Decisive limitation or exception | Common near miss |
|---|---|---|---|
| Child | Reasonable child of similar age, intelligence, and experience | Adult activity triggers the adult standard; traditional age presumptions may also determine capacity | The child’s actual care or good intentions do not replace the objective child standard |
| Physical disability | Reasonable person with the same physical disability | The actor must account for known or reasonably foreseeable limitations | A physical disability differs from mental illness or voluntary intoxication |
| Mental disability or voluntary intoxication | Ordinary reasonable person; intoxication is judged against a sober reasonable person | The impairment generally does not excuse negligent conduct | Do not lower the standard merely because this defendant could not exercise ordinary judgment |
| Professional service | Reasonably competent professional in the same field and, when relevant, specialty | Personal inexperience or lack of confidence does not lower the professional standard | Specialized knowledge matters only when the actor is acting in the professional role |
| Qualifying emergency | Reasonable person facing the same emergency | The emergency must be sudden and unexpected and not created by the actor’s negligence | A difficult, busy, or pressured situation is not automatically an emergency |
Children. A child is ordinarily judged by the conduct of a reasonable child of similar age, intelligence, and experience. The child is not compared with a reasonable adult merely because an adult might have acted more carefully. Traditional age presumptions often taught with this rule treat children under five as conclusively incapable of negligence, children from five through fourteen as presumptively incapable subject to rebuttal, and children over fourteen as presumptively capable subject to rebuttal. If the facts make the age-presumption issue relevant, apply the governing jurisdictional rule supplied or indicated by the problem.
The major exception is the adult-activity exception. When a child engages in an activity normally undertaken only by adults-such as operating a motor vehicle, motorboat, or aircraft-the child is judged by the adult reasonable-person standard for that activity. The exception concerns the activity that produced the risk, not every act the child performs. A child riding an ordinary bicycle remains under the child standard; a child driving a car is judged as an adult driver. A child’s lack of instruction does not restore the child standard.
Physical impairment. A person with a physical disability is judged by a reasonable person with the same physical disability. Thus, the question may be what a reasonably prudent blind person, deaf person, or person with limited mobility would have done under the same conditions. The actor must still take reasonable account of known limitations. If the actor knows that a medical condition makes driving dangerous, continuing to drive may be unreasonable even though the comparator also has that condition.
A sudden physical incapacitation creates a different issue. If a seizure, fainting episode, or similar loss of control was genuinely unforeseeable, the actor may not be negligent for failing to anticipate it. If the condition or its disabling effect was known or reasonably foreseeable, the actor must take precautions a reasonable person with that knowledge would take. This is not a general reduction of the standard; it is an inquiry into foreseeability of the incapacitation before the conduct.
Mental impairment and intoxication. Mental illness, cognitive limitation, emotional instability, or poor reasoning ordinarily does not produce a more forgiving negligence standard. The actor is compared with an ordinary reasonable person. Voluntary intoxication likewise does not excuse negligence; the actor is judged against the conduct of a reasonable sober person. A defendant cannot choose impairment and then use that impairment to redefine reasonable care.
Do not confuse an impairment with a professional’s specialized skill. A professional’s superior knowledge is relevant because the actor undertook professional service, not because every person with unusual knowledge is automatically held to a professional standard.
Professionals. A professional who renders professional services is held to the standard of a reasonably competent professional in the same field under the same circumstances. A specialist is generally compared with a reasonably competent practitioner in that specialty; a general practitioner is not automatically judged by the standard of every specialist. The professional cannot defend by saying that the defendant was inexperienced, newly licensed, or less skilled than peers.
The professional standard applies to professional conduct. When the same person engages in ordinary nonprofessional conduct, the ordinary reasonable-person standard ordinarily governs that conduct. A licensed physician who negligently drives a car is ordinarily judged as a driver, while a physician treating a patient is judged as a reasonably competent physician under the circumstances.
The Emergency Adjustment: Sudden Danger Without Self-Created Risk
The emergency doctrine changes the circumstances against which conduct is evaluated. It applies only when there is a sudden and unexpected emergency and the actor did not create the emergency through negligence. The question then becomes what a reasonable person would have done while facing that emergency, without the time for ordinary deliberation.
The doctrine is not a no-liability rule. A person in an emergency must still act reasonably; the doctrine recognizes that reasonable choices may be made under pressure and that hindsight is especially unreliable. If the actor negligently creates the emergency-such as by driving carelessly before the sudden maneuver-the actor does not receive the emergency adjustment for the resulting response.
A routine deadline, crowded workplace, heavy traffic, or ordinary pressure is not automatically an emergency. Nor does an actor create an emergency merely because a reasonable response later proves unsuccessful. The decisive questions are whether the event was sudden and unexpected and whether the actor’s own negligence caused it.
The emergency adjustment is layered onto the actor’s other classification. A child engaged in an adult activity, a professional treating a patient, or a person with a physical disability does not become an ordinary unrestricted adult merely because an emergency occurs. Apply the appropriate comparator while accounting for the emergency conditions.
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One Item With Two Credits: Classifying the Actor and the Crisis
Twelve-year-old Alex drove a full-size motorboat in a marked channel during a supervised race. Operating that motorboat was an activity normally undertaken only by adults. A deer suddenly jumped from a low bank into the channel, creating an unexpected danger that Alex had not caused through earlier negligence. Alex immediately swerved, and the boat struck a dock.
Practice
Which TWO statements are most accurate?
| (A) Alex must be judged by the conduct of a reasonable twelve-year-old because Alex’s age always controls. | (B) Alex must be judged by the adult reasonable-person standard because operating the motorboat was an adult activity. | (C) The sudden deer means Alex cannot be negligent because the emergency doctrine provides an absolute defense. | (D) The emergency doctrine cannot apply because Alex is a child. | (E) The emergency should be evaluated by asking what a reasonable person would have done while facing that sudden and unexpected danger. | (F) Alex’s lack of adult experience automatically requires the child standard even when Alex operates an adult activity. | |
|---|---|---|---|---|---|---|
| Your answers |
Three Classification Drills: Putting the Standard on the Facts
Practice
A driver carefully obeyed the speed limit but continued through a narrow street after learning that a bridge ahead was covered with ice. The driver argues that an ordinarily careful driver would not have known about the ice. What standard governs the driver’s conduct?
A nine-year-old rode an ordinary bicycle through a neighborhood and collided with a pedestrian after failing to look around a parked van. No motor vehicle or other adult activity was involved. Which standard applies?
A licensed dentist performed a dental procedure and argues that the dentist should be judged by an ordinary reasonable person because the dentist had less experience than other dentists. Which standard applies?
High-Yield Points - ⚡ Biggest Takeaways
Select the comparator before deciding whether conduct was unreasonable. A child doing an adult activity receives the adult standard for that activity. Physical disability changes the comparator; mental impairment and voluntary intoxication generally do not. An emergency requires sudden unexpected danger not negligently created by the actor.
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