An occupier who establishes a delivery system requiring entrants to walk backwards through a narrow doorway cannot rely on the obviousness of a hazard in the doorway as a complete answer to liability, where the delivery task necessarily diverts the entrant's attention from the hazard. The weight to be given to an expectation that an entrant will exercise reasonable care for their own safety depends on the circumstances, including the demands of the task the entrant is performing. A delivery driver's failure to avoid a known hazard while concentrating on manoeuvring a heavy load may be an error of judgment rather than contributory negligence.
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