19 With respect there was a precaution that a reasonable person would have taken, namely to reduce his speed to that shown on the advisory speed sign.
20 The plaintiff saw the advisory speed sign and knew what it meant. He also knew that the road was wet and three chevron signs told him he was approaching a tight curve. He acknowledged in cross-examination that the 65 kph on the advisory sign was the maximum safe speed in good conditions and that if the road was wet it would be prudent to take the curve at a lower speed (black 1/200-1).
21 The appeal on this point challenges the inference the trial judge drew from primary facts which are not in dispute and she was not in a position of advantage. In my judgment she erred in finding that there was no precaution that a reasonable person in the plaintiff's position would have taken and this court should intervene and substitute a finding of contributory negligence based on the plaintiff's excessive speed.
22 The remaining issues are causation and apportionment. The findings of negligence against the RTA and the deceased stand, and a finding of contributory negligence based on excessive speed has been substituted. The judge found that the negligence of the RTA was causative but the negligence of the deceased was not because (para [88]) up to speeds of 85 kph the condition of the rear tyres played no part in the capacity of the vehicle to travel through the curve without loss of traction. She also appears to have found that the plaintiff's speed was not causative because he would have had no problem if the road surface had been adequate (para [58]).
23 The front wheels on the vehicle were roadworthy and did not lose traction in the curve but the rear wheels did. This caused the vehicle to fishtail and to cross onto its incorrect side of the road (para [2]).
24 The judge accepted the evidence of Mr Jamieson, the expert called for the plaintiff, and Mr Kiernan, the expert called for AAMI. In their view the Mazda's loss of traction in the curve was due to three causes, the speed of the vehicle, the state of the rear tyres, and the condition of the road surface.
25 Mr Jamieson said that if any one of those factors had been eliminated the crash probably would not have occurred (blue 1/24, 26).
26 Mr Kiernan said that the likely reason for the rotation of the rear wheels was that the smooth tyres started to slide but the treaded front tyres did not (blue 2/286). This, as Mr Jackson QC for the RTA submitted, indicated that the condition of the rear tyres played a part in the accident. It also indicated that if all the tyres had been good the vehicle would have safely negotiated the curve. In Mr Kiernan's opinion the critical speed for the smooth tyres on this corner in wet conditions was 75 to 80 kph (2/287).
27 Mr Kiernan also considered that the road factors referred to, the smooth rear tyres, and a speed well in excess of that recommended all contributed to the accident. He said that if the driver had observed the recommended speed limit he would not have lost control of his vehicle (2/288, 291), and that the rear smooth tyres caused the loss of control at the estimated speed of between 80 and 90 kph (blue 2/ 439).
28 The judge found that but for the condition of the road surface the Mazda could have safely negotiated the curve despite its bald rear tyres at speeds up to 85 kph (para [85]). She therefore concluded that the Mazda's speed, and the state of the rear tyres played no part in the accident (para [88]).
29 These findings are contrary to the expert evidence of Mr Jamieson and Mr Kiernan that Her Honour accepted. This established that the accident would not have happened but for the negligence of the RTA and that it would also not have happened but for the speed of the vehicle and the state of the rear tyres. The preliminary, but for test of causation: March v Stramare (E & M H) Pty Limited [1991] HCA 12, 171 CLR 506, 514, 515-6 was applied to the negligence of the RTA. It should also have been applied to the negligence of the deceased, and the contributory negligence of the plaintiff.
30 As Hodgson JA pointed out during argument the state of the tyres could only be excluded as a cause if the accident would have occurred even if the rear tyres were roadworthy. There was no expert evidence to that effect. The same point applies in respect of the driver's speed. This could only be eliminated as a cause if the accident would still have happened if the car had been travelling at 65 kph. The speed, the state of the tyres, and the state of the road, including the absence of additional signage, were all concurrent causes of the accident operating at the moment when control was lost.
31 Mr Jackson submitted that the judge erred in thinking that she had to identify the cause of the accident that is a single cause. It is not clear that she made that error. However she evidently thought that having found that the RTA's negligence was a cause there was no need for any further inquiry into causation. She failed to apply the same test to the factors for which the driver and the deceased were responsible. As Mason CJ said in March v Stramare (E & M H) Pty Limited (at 512):
"… courts readily recognise that there are concurrent and successive causes of damage on the footing that liability will be apportioned as between the wrongdoers."
See also Andar Transport Pty Ltd v Brambles Ltd [2004] HCA 28, 217 CLR 424, 441-2.
32 In my judgment this court must intervene and substitute findings that the negligence of the deceased and the contributory negligence of the plaintiff were concurrent causes of the accident, and liability must be apportioned.
33 The established approach to apportionment in a case such as this is to first determine the extent to which the plaintiff's damage should be reduced having regard to his share of the responsibility (Law Reform (Miscellaneous Provisions) Act 1965 s 10(1)) which must be compared with the responsibility of all defendants liable to the plaintiff: Barisic v Devenport [1978] 2 NSWLR 111; Fitzgerald v Lane [1989] AC 328.
34 Apportionment requires an evaluation of the causative potency of the plaintiff's contributory negligence, and that of the negligence of the relevant defendants. It also requires an evaluation of the relative culpability of the parties, namely the degree to which their conduct departed from the standard of care of the reasonable man: Barisic v Devenport (above) at 140-1 per Samuels JA.
35 In my judgment the defendants' breaches of duty and the plaintiff's failure to take reasonable care for his own safety had equal causative potency because all were operative when control of the vehicle was lost. However the RTA's negligence in failing to reduce the speed limit and erect a warning (slippery when wet) sign also contributed to the plaintiff's excessive speed.
36 The culpability of the parties also differed. The plaintiff should not have exceeded the advisory speed in wet conditions on a tight corner marked by three chevron signs but the RTA had not reduced the speed limit to 80 kph or warned him that the curve was slippery when wet. The RTA alone knew that the road surface provided inadequate friction, that it was slippery when wet, and dangerous in wet conditions above 80 kph. The plaintiff did not know that the rear tyres were bald, but the deceased ought to have known this. His culpability in ignoring an advisory speed sign for a tight corner in wet conditions was significantly less than it would have been if he exceeded the speed limit and ignored a warning sign. In the circumstances I would apportion responsibility as between the plaintiff and the defendants 20:80.
37 The culpability of the RTA was much greater than that of the deceased because it knew of the problems at this corner but did nothing while it was not established that she was aware of the condition of her rear tyres. It was also partly responsible for the plaintiff's excessive speed. Nevertheless her neglect of duty to other road users, including the plaintiff, showed a marked departure from the standard of care of the reasonable vehicle owner. In the circumstances I would apportion responsibility between the RTA and the deceased in the proportion 75:25.
38 The RTA and AAMI are each entitled to verdicts but not judgments on their cross claims in accordance with the principles established in Andrews v Nominal Defendant (1962) 63 SR (NSW) 110.
39 The following orders should be made:
1. Appeal allowed.
2. Judgment in favour of the Plaintiff for $1,211,287.87 set aside.
3. Judgment in favour of Australian Associated Motor Insurers Ltd set aside.
4. Set aside the order that the second defendant pay the costs of the first defendant.
5. In lieu thereof substitute judgment for the plaintiff for $969,030.24 with costs against both defendants with effect from 28 November 2006.
6. On the first defendant's cross-claim verdict for the cross-claimant AAMI against the cross-defendant RTA for $726,772.68 and 75% of the costs of the plaintiff of the proceedings in the Common Law Division.
7. On the second defendant's cross-claim verdict for the RTA against AAMI for $242,257.56 and 25% of the costs of the plaintiff of the proceedings in the Common Law Division.
8. No order as to the costs of either cross-claimant of the proceedings on the cross-claim.
9. First and second respondents each to pay one-half of the appellant's costs of the appeal.
10. The first respondent is to have a certificate under the Suitors' Fund Act.
11. Liberty to apply in respect of any claim for indemnity costs.