The speed of the plaintiff's motorcycle
22The plaintiff consistently maintained that his prebraking speed was 90 km/h. He reluctantly agreed that this speed exceeded the limit of 80 km/h, stating that it was a technical breach only.
23In addition to Mr Keramidas and Dr Rechnitzer, expert opinion was obtained from Mr McDonald and Mr Jamieson.
24Mr McDonald provided a number of reports in which he estimated the plaintiff's prebraking speeds variously between 102-105 km/h; 90-100 km/h; and 103-115 km/h. He also accepted Mr Keramidas' estimates of the plaintiff's speed. Mr McDonald was not called for cross examination and his opinions were undermined by the criticisms of Dr Rechnitzer that were not challenged by the defendant. In particular, he was critical of Mr McDonald's estimate of a speed of 100 km/h because it was based on an understatement of the weight of the motorcycle and its rider. A further difficulty with Mr McDonald's estimates was that they were based on speeds at impact and at the start of the skid marks that were different to those that were subsequently agreed by Mr Keramidas and Dr Rechnitzer and accepted by the parties.
25Mr Jamieson adopted a preskidding speed of 90 km/h and an impact speed of 78 km/h, speeds that were accepted by Mr Keramidas and Dr Rechnitzer or close to their agreed speeds.
26Mr Jamieson's report did not provide an estimate of the plaintiff's prebraking speed. In cross examination he rejected the defendant's contention that this speed would necessarily exceed 90 km/h. His opinion was that motorcycles have highly efficient braking systems. In addition, motorcyclists, because they travelled in an open environment and were required to maintain their motorcycles in an upright position, were more alert than car drivers. He acknowledged that deceleration rates depended substantially on the skill of the motorcyclist and the evenness of the road pavement.
27Mr Jamieson also said that he relied on the physical evidence available in arriving at his opinion. In this case there was none that suggested that there was any braking before the skid marks appeared on the road and he noted that, if responding to a vehicle crossing the path of travel, a motorcyclist would apply the brakes as hard as possible, potentially locking them very quickly.
28Mr Keramidas relied on the plaintiff's evidence in Local Court proceedings that prior to impact he changed gear and applied the brakes to his front wheel only. On this basis and on the assumption that the plaintiff applied his brakes immediately, he concluded the plaintiff was 25.4 to 29 metres south of the skid marks when he changed gear and was travelling between 97 and 113 km/h.
29Dr Rechnitzer did not address the likely speed of the motorcycle prior to the appearance of the skid marks. Like Mr Jamieson, he said any such calculation would be based on speculation rather than physical evidence.
30An aspect involved in the estimation of the plaintiff's prebraking speed arose from his evidence of retardation manoeuvres undertaken in response to the emergency that faced him. In the statement (Exhibit 3) that the plaintiff provided to Senior Constable Cleary on 27 September 2010 he said that after he saw the defendant's utility starting to turn into the driveway:
I immediately pulled on the front brake and tried to steer away towards the back of the car to avoid hitting the front of the car.
I was able to wash off enough speed and was able to change gear down.
31In evidence to the Local Court, the plaintiff said that his immediate reaction when he saw the utility turning across the road was to apply heavy pressure to his front brake. He attempted to steer to the right away hoping to pass behind the utility as it continued on its path across the road. He said nothing of a change of gear.
32In evidence to District Court, the plaintiff said that, after applying the front brake, he steered to the left with a view to passing in front of the utility. It became apparent that the utility was continuing its crossing, so he steered to the right to attempt to pass behind it. He again said nothing of changing gear.
33The plaintiff denied that this was the first occasion on which he claimed to have veered to the left in response to the hazard he faced. In any event, he said, he only contemplated it for split second.
34The plaintiff acknowledged that the police statement made reference to a gear change. He said this statement was provided 11 days after the accident, while he was still under treatment in hospital and after a number of extensive operative treatments. He accepted that, if this was what he told police, it was what he believed at the time. He now considered it unlikely and that more probably any gear change took place as he approached the curve in the road and before the hazard presented by the turning utility came into view. He said he had no time to change gear when he was braking and steering.
35Mr Keramidas and Dr Rechnitzer were asked a number of questions about the time that might be involved in changing gear and steering first to the left and then to the right. The point of these questions was to determine whether the distance between the plaintiff and the defendant when he first sighted the utility was greater than the 50 metres that he claimed so that it was likely that he was travelling at a speed greater than 90 km/h.
36Dr Rechnitzer took issue with Mr McDonald's subsequent assessment of 103-115 km/h and Mr Keramidas' assessment of 97-113 km/h. He said these assessments were speculative because they were based on the plaintiff's statement that he was able to reduce speed sufficiently to change down a gear. He noted that when giving his evidence in the Local Court the plaintiff was confused about the point of impact and that, when he spoke of changing down a gear, he might have been referring to earlier part of his journey. Further, he said, a gear change was inconsistent with the plaintiff's recollection that he first saw the defendant when the front of the utility was already across the double white lines.
37Dr Rechnitzer was not able to estimate the time that would be required to change gear, veer to the left and then to the right. Mr Keramidas agreed that these manoeuvres were taken into account in his estimates of speed. He also was unable to provide an estimate but said:
No, I think that the best estimation I've been able to give is actually the estimation I gave in my report, and that's where, by the way, those additional speeds, or the higher speeds come from, because we agreed up to the point of skidding. So it would be somewhere in that range of 113 km/h. (Transcript 230.21)
38In the course of his evidence, Mr Keramidas reversed the opinion expressed in his report that a change of gear after the brakes were applied would further reduce speed prior to the point at which the skid marks appeared. He and Dr Rechnitzer agreed that it was not possible to change gear once the rear wheel was locked so that, if there was a change of gear, it occurred before the skid marks appeared. They further agreed that changing gear, in any event, might not result in any reduction in speed.
39The defendant relied on a statement of Ms O'Brien dated 6 February 2014 (Exhibit 11) to the effect that she was overtaken by a motorcycle on Freemans Drive between Freemans Waterhole and Palmers Road. She estimated the speed of the overtaking motorcycle to be 120 - 130 km/h. She drove at an average speed of 80 km/h and came to the scene of the accident. She stated that she was certain that the plaintiff was the motorcyclist who overtook her in the area of Freemans Waterhole.
40There was substantial debate between myself and Mr Wilson, counsel for the defendant, concerning the admissibility of this evidence having regard to the capacity of a driver of a motor car to estimate the speed of an overtaking vehicle and its relevance to the determination of the prebraking speed at which the plaintiff travelled immediately before the accident.
41The plaintiff ultimately did not oppose the admission of the statement into evidence and did not require Ms O'Brien for cross examination. However, I continued to express my reservations concerning the weight that could be given to this material, particularly having regard to the following:
(1)Mr Keramidas and Dr Rechnitzer agreed that the distance from the roundabout on Freemans/Palmers Road to the point of impact was 9,700 metres and that this distance, at a constant speed of 80 km/h would be covered at the rate of 22.3 metres per second. If Ms O'Brien arrived at the point of impact two minutes after the accident, the plaintiff covered the same distance at an average speed of 110 km/h. If she arrived four minutes after the accident, the plaintiff's average speed was 177 km/h.
(2)The defendant said that Ms O'Brien arrived about four minutes after the accident. In cross examination she agreed that, because of her shocked condition, she was unsure of times of events after the accident and that the time of Ms O'Brien's arrival could have been between 1 and 20 minutes after the accident.
(3)Senior Constable Cleary said that at the time he interviewed Ms O'Brien she did not state that the motorcycle that overtook her was the motorcycle involved in the accident. Further she did not nominate the overtaking speed of the motorcycle.
(4)In his evidence in the Local Court, Senior Constable Cleary did not recall that Ms O'Brien told him that motorcycle travelled at excessive speed. Further, he said that he did not believe the blue motorcycle referred to by Ms O'Brien was that ridden by the plaintiff because of the distance between locations.
(5)Most significantly, notwithstanding this material, Mr Keramidas made no change to his opinion that the prebraking speed of the motorcycle was between 97-113 km/h.
42The parties provided a number of estimates of motorcycle speeds and required stopping distances in an effort to advance their positions concerning the cause of the accident. They included:
(1)Mr Keramidas' Table of Time/Distance and Stopping Potential (Exhibit 5B) provided a calculation of the total stopping distances required at various speeds on the basis of a sight distance of 120 metres to the point of impact, perception/response time of 1.10 seconds and braking rate of 0.8 g. The table established that at speeds between 75 km/h and 125 km/h, the plaintiff, had he seen the defendant from a distance of 120 metres, could have stopped his motorcycle before impact. The conclusion that could be drawn from this table was that if the plaintiff was beyond the defendant's sight line at the time she started to turn across the northbound lane, his speed was more than 125 km/h. Alternatively, the plaintiff travelled at some lower speed but was unable to bring the motorcycle to a stop prior to impact because:
(a)he was not paying attention; or
(b)he misjudged the situation and thought that the defendant would have moved from his path of travel before he arrived at the point of impact.
(2)Dr Rechnitzer challenged any finding that, on the basis of this table, at a prebraking speed of 125 km/h, the plaintiff could have stopped five metres prior to impact. He said this proposition assumed that the hazard was in fact perceived by the plaintiff at the distance of 120 metres and ignored a key point, namely that when the motorcyclist was 120 metres away the utility was also still moving towards the point of impact and had not yet crossed to the other side of the road. Mr Keramidas agreed.
(3)Dr Rechnitzer also disagreed with the proposition that, if the plaintiff had not misjudged the situation and had taken emergency action earlier, it was likely that he would have arrived at the point of impact .5 of a second later and likely that he would have avoided impact. He said this proposition contained too many assumptions.
(4)Another hypothetical proposition established that at a speed of 130 km/h or above the plaintiff would have been beyond the defendant's line of sight at the time she started to turn. If, at a distance of 120 metres, the plaintiff reacted to the emergency two seconds prior to impact, at a speed of 200 km/h, the collision would have been unavoidable. If he reacted to the emergency three seconds prior to impact, the speed would have been 145 km/h; at four seconds, 108 km/h.
(5)Tables 1, 2 and 3 to Dr Rechnitzer's report analysed time and distances on the basis of his estimate of a prebraking speed of 90 km/h, Mr Keramidas' estimate of a prebraking speed of 97 km/h and Mr Keramidas' estimate of a prebraking speed of 113 km/h. Mr Keramidas accepted the calculations set out in these tables were mathematically correct. In each case, the analysis established that, unobstructed by a truck, the motorcycle was within the defendant's line of sight at the time at which she was about to cross the double white lines, even if her speed when crossing the northbound lane was 10 km/h as propounded by Mr Keramidas.