A more thorough explanation:

A reasonably prudent person is a hypothetical standard used in legal cases to determine whether someone acted with negligence. This standard is based on a person who exercises the degree of attention, knowledge, intelligence, and judgment that society requires of its members for the protection of their own and of others' interests.

The reasonably prudent person acts sensibly, takes proper precautions, and does things without serious delay. This standard is also known as the reasonable person, prudent person, ordinarily prudent person, or highly prudent person.

For example, if a driver is involved in a car accident, the court may ask whether a reasonably prudent person would have acted differently in the same situation. If the answer is yes, the driver may be found negligent and held responsible for damages.

It's important to note that the reasonable person standard is not necessarily the same as the average person. The reasonable person is someone whose notions and standards of behavior and responsibility correspond with those generally obtained among ordinary people in our society at the present time.