A highway authority's duty of care requires it to take additional precautions beyond standard signage when conditions deteriorate to the point where the authority's own officers recognise the heightened danger. Where available workers can be deployed as flagmen at no additional cost to warn particularly vulnerable traffic of hazards not conveyed by existing signage, failure to do so constitutes a breach of duty. Internal protocols requiring authorisation from a superior before taking action do not excuse delay in implementing reasonable precautions.
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