An employee's implied contractual duty to exercise reasonable care in the performance of duties does not extend to a duty to take care for the employee's own safety, and breach of such a duty (even if it existed) would not operate as a defence to the employer's breach of its duty to provide a safe system of work. The employer's duty to provide a safe system of work includes anticipating foreseeable acts of negligence by employees. An employee's misjudgment in assessing workplace conditions, particularly where conditions are adverse (wet, slippery, restricted visibility), does not amount to contributory negligence.
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