A public authority that invites persons to use its land owes a duty of care even to those who fail to take reasonable care for their own safety, where the risk of injury cannot be eliminated by the exercise of reasonable care by any individual user and the authority is in a position to control the danger. The obviousness of a risk does not relieve a public authority of its obligation to take reasonable measures to guard against it in such circumstances. The degree of a plaintiff's contributory negligence cannot determine whether a duty of care exists.
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