Jur.2d, Premises Liability, s 27 at 258 and cases cited therein. Further, negligence law does not require an owner or occupant to be an insurer against all accidents that occur on the premises. Jur.2d, Premises Liability, s 23 at 254. Only Unreasonable Risks Cause A Duty to Arise Not every condition encountered by a plaintiff who sustains injury is by the fact of the happening of an accident, alone, deemed to be dangerous. It is only conditions that present an unreasonable risk of harm that are dangerous .
People can hurt themselves on almost any condition of the premises.
That is certainly true of an ordinary flight of stairs. But it takes more than this to make a condition unreasonably dangerous. If people who are likely to encounter a condition may be expected to take perfectly good care of themselves without further precautions, then the condition is not unreasonably dangerous because the likelihood of harm is slight. This is true of the flight of ordinary stairs in a usual place in the daylight. It is also true of ordinary curbing along a sidewalk, doors or windows in a house, counters in a store, stones and slopes in a New England field, and countless other things which are common in our everyday experience.