DECISION
18 It appears that the primary judge assumed in Telstra's favour that a concrete cover had initially been placed over this pit, and had not been displaced by Telstra itself. It is not entirely clear why the primary judge made these assumptions in favour of Telstra, when it led no evidence to that effect, but no challenge is made on behalf of Mr. Bisley to those assumptions. The primary judge also accepted Telstra's submission that it would have been entirely unrealistic to require that Telstra should maintain constant vigilance of the manhole in order to ensure that the cover was not removed, and no complaint is made on behalf of Mr. Bisley about that finding.
19 The primary judge found that the pit without the cover was a hidden trap, and constituted a risk of serious injury to a person who fell into it, and these findings were plainly open to him. Furthermore, the primary judge found it was foreseeable that from time to time people would be on the area; and although the primary judge did not express this in terms of likelihood of the risk eventuating, it is plain from the tenor of his judgment that he accepted that there was a significant risk that persons present on the area, where this hidden trap existed, could fall into it.
20 In those circumstances, it was plainly open to the primary judge to conclude that Telstra had an obligation to exercise reasonable skill and care with a view to ensuring that the pit it created did not cause injury. In circumstances where "constant vigilance" was impractical, this might have been achieved by installing a robust cover that was difficult to move. It was plain from the evidence that, at the time of the accident, the cover was not over the hole, nor were fragments of it in the hole, nor was it obvious in a position immediately adjacent to the hole. In those circumstances, in my opinion the inference was open to the primary judge, in the absence of further evidence, that the cover had been removed.
21 When one has regard to the assumption favourable to Telstra that it had not been removed by Telstra, to the lack of attraction of such a cover to larceny, and to the circumstance that it did not appear to have been broken in place by vandals, it was in my opinion open to the primary judge to consider that the fact of its removal supported an inference that it was "easily removed", or at least that its removal was not so difficult as to make reasonable, in circumstances where there was no "constant vigilance", the lack of any warning of the presence of the pit. In so far as Telstra relied on the robustness and permanence of the cover to overcome any inference of negligence from its creation of the pit, it was open to Telstra to lead evidence of its robustness and permanence, which it did not do. In those circumstances, in my opinion the inference of easy removal could more readily be drawn by the primary judge.
22 Having drawn that inference, in my opinion it was open to the primary judge to reach the view that the exercise of reasonable skill and care by Telstra, in circumstances where the pit cover was readily removable, would have required the placing of warning signs. As submitted by Ms. Katzmann SC for Mr. Bisley, the evidence of similar markers on nearby pits, and the evidence that markers were subsequently put on this pit, coupled with the absence of evidence that the expense of doing so was unreasonable, could support the inference that the expense and inconvenience of installing such warnings was not such as to prevent it being a breach of Telstra's duty of care not to have installed such markers: cf. Nelson v. John Lysaght (Australia) Limited (1975) 132 CLR 201.
23 Turning to the particular submissions of Mr. Watson, in my opinion the matters raised by the various provisions of the Civil Liability Act relied on by Mr. Watson were taken into account by the primary judge. In terms of s.5B(1), the primary judge found the relevant risk was foreseeable, and not insignificant, and that a reasonable person in Telstra's position would have taken precautions which Telstra failed to take. In determining whether a reasonable person would have taken such precautions, the primary judge did take into account the probability that harm would occur if care were not taken, the likely seriousness of the harm and the burden of taking precautions to avoid the risk of harm. There was no explicit reference to the social utility of Telstra's activity, but there is nothing to suggest that the primary judge did not accept and act on the basis that Telstra's activity had substantial social utility. Similarly, in terms of s.5C(a), in finding that the taking of appropriate precautions was not unduly or disproportionately costly, there is nothing to suggest that the primary judge left out of account that similar precautions may need to be taken in relation to similar pits. The same general comment applies to s.42 of the Act.
24 In my opinion, the primary judge did in substance find that Telstra acted unreasonably. For the reasons given above, the primary judge was not in error to hold that there was an evidentiary onus on Telstra on the question of what happened to the pit cover. The primary judge's statement that there was a duty on Telstra "to ensure that adequate warning was provided" was not in my opinion an inaccurate statement as to the content of Telstra's duty, which plainly was a duty to exercise reasonable care; but rather, it was a statement of a conclusion as to what the exercise of reasonable care required in the circumstances of this particular case. In so far as it suggests an elevation of a duty of care into something like strict liability, it is no more than an infelicitous expression.
25 The primary judge did not decide in Mr. Bisley's favour on the basis of a deficiency in design. Rather, he found that, in circumstances where he inferred that Telstra had used a cover that was easily removable, Telstra's duty of care required the placing of some warning; and in my opinion, that view of the case was within the pleadings.
26 Finally, in my opinion the finding that, had such a warning been in place the accident would not have happened, was well open to the primary judge. The failure of Mr. Bisley to give evidence that, if such a warning sign had been in place, he would have avoided the pit, was of no significance because, as pointed out by Ms. Katzmann, that evidence that could not have been given, by reason of s.5D(3)(b) of the Civil Liability Act.