A local council exercising some control over a beachside promenade, pools and steps does not owe a duty to erect warning signs about slippery rocks on a tidal rock shelf between pools that is not itself under the council's control, where the risk of slipping on wet or marine-growth-covered tidal rocks is obvious to any reasonable adult. The Shirt calculus does not provide a short pathway to a ready conclusion of breach merely because a simple and cheap measure can be suggested; the court must address the degree and magnitude of the risk, its degree of probability, and other relevant factors including the obviousness of the risk and the practical difficulties of the suggested response.
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