Mr Wright was not challenged in cross-examination on this evidence.
34 Mr Wright's unchallenged evidence makes it impossible to accept the appellant's submission that the respondent breached his duty of care by failing to keep sufficiently to the left of the road. Mr Wright's report, a plan prepared by him and photographs showing his yellow markings at the site all confirm that at the commencement of the skid, perhaps 13 metres from the point of impact, the respondent's left tyre was within 0.6 metres of the western edge of the road. At this point, the bull bar would have protruded even further towards the edge of the road (as appears from the photographs of the station wagon). While the road was certainly narrow, Mr Maiden did not explain how the respondent could have reasonably been expected to drive even closer to the edge than he did. The fact that the vehicle's left tyre finished only 0.3 metres from the edge at the point of impact is attributable to the narrowing of the road and the vehicle sliding with the camber of the roadway. The physical evidence supported the respondent's own evidence that he was "hard up on the … left hand side of the road" as he was approaching the curve.
35 Nor did Mr Maiden explain how it could have made any difference had the respondent driven closer to the western side of the road as he approached the curve. On the primary Judge's findings, which cannot be successfully challenged, the appellant's motorcycle collided upright and head on with the station wagon, without the appellant braking or swerving, the point of impact being on the left hand side of the station wagon. Since the respondent applied his brakes hard and went into a skid, he presumably would have been unable to swerve to the left. Leaving that difficulty aside, had the respondent travelled closer to the edge of the road, or veered as far as he could to the left (which was not very far) the collision would simply have occurred at a point closer to the centre of the station wagon's bull bar. Moreover, taking a path closer to the western edge of the road would have limited even further the respondent's line of vision towards the oncoming motorcycle.
36 It is also difficult to understand how the physical evidence is compatible with the submission that his Honour should have found that the respondent was travelling at an excessive speed in the circumstances. Mr Wright's evidence was that, despite the respondent being prevented from seeing the appellant until very late (because of the path the appellant took across the curve), the respondent had come to either a complete stop or nearly a complete stop at the point of the collision. This conclusion was consistent with the respondent's impression that his vehicle was moving slowly at the point of impact and with the evidence of his passenger, Ms Balkin, that the station wagon was "pretty much…at a stand still" at the point of impact. There was no error in the finding that it was the appellant's speed, unchecked by any braking, that caused him to collide with the respondent's stationary or almost stationary station wagon.
37 Mr Maiden challenged the conclusions reached by Mr Wright as to the respondent's speed, on the ground that he had wrongly assumed that the motorcycle, immediately after the collision, had come to rest just in front of the station wagon. Mr Maiden relied on evidence from the appellant suggesting that his motorcycle had in fact come to rest behind the station wagon, indicating that the respondent's vehicle may have been travelling faster than Mr Wright had thought. However, the respondent's evidence was that after the collision the appellant ended up on the grass, some two metres to the front and side of the station wagon. The respondent's passenger, Ms Balkin, gave evidence to the same effect. That evidence was entirely consistent with the physical evidence dealt with in Mr Wright's report. The primary Judge was entitled to prefer that evidence over the appellant's evidence that the motorcycle finished up behind the station wagon.
38 As I have noted, the appellant's written submissions contend that Constable Christensen could not have located the point of impact from the debris on the road, since the appellant's father and sister had given evidence that they had removed debris before Constable Christensen arrived at the scene. But his evidence was that the appellant's father and sister were present at the scene when he arrived. Moreover, neither the appellant's father nor his sister suggested that they had removed all debris from the site. It was not put to either Constable Christensen or Mr Wright in cross-examination that they were incorrect in reporting that they had seen debris at the site of the collision. Nor was it put to Constable Christensen that the motorcycle had been removed from the site by the time he attended the site of the collision on the day it had occurred.
39 Mr Maiden rather faintly suggested that the respondent had breached his duty of care by failing to sound his horn as he approached the curve. Whether there was any breach of duty depends on whether, in the circumstances, a reasonable person in the respondent's position would have taken the precaution of sounding the horn: Civil Liability Act 2002, s 5B(1)(c). As the primary Judge pointed out (at 21), the response of a reasonable person would be dictated by a number of factors, including reasonable expectations as to the line that oncoming traffic would follow. On his Honour's findings, had the appellant been travelling along the left hand side of the track as he approached the curve, not only would he have seen the respondent's station wagon earlier, but the respondent would have seen the motorcycle earlier and would have had no difficulty in avoiding a collision.
40 The logic of the appellant's position is that the driver of every vehicle driving along a track of this kind would be obliged, in the exercise of reasonable care, to sound his or her horn every time the vehicle approached a curve that restricted vision to some extent. However, the exercise of reasonable care did not require the respondent to assume that at every such curve a motorcycle or similar small vehicle would approach on the right hand side of the track, rather than on the left, and at a higher speed than was safe in the circumstances.
41 As Mr Rewell pointed out, it is not permissible to reason from the fact that, in hindsight, action might have been taken that would have avoided a collision to conclude that the defendant failed to exercise reasonable care. As the High Court observed in Derrick v Cheung [2001] HCA 48; 181 ALR 301, at 305 [13]:
"Few occurrences in human affairs, in retrospect, can be said to have been, in absolute terms, inevitable. Different conduct on the part of those involved in them almost always would have produced a different result. But the possibility of a different result is not the issue and does not represent the proper test for negligence. That test remains whether the plaintiff has proved that the defendant, who owed a duty of care, has not acted in accordance with reasonable care."