Roads and Traffic Authority v Royal

The High Court of Australia heard an appeal concerning a motor vehicle collision at an intersection where Bago Road met the northbound carriageway of the Pacific Highway. The plaintiff, Mr George Smurthwaite, was injured when his vehicle, while attempting to cross the highway, collided with the vehicle of Mr Grant Royal, the first respondent. The plaintiff had stopped at a stop sign and holding line before proceeding into the path of oncoming traffic, including a dedicated right-turn lane. The plaintiff, suffering from cerebral trauma, was unable to recall the events immediately preceding the collision. The Roads and Traffic Authority (RTA), the appellant, was alleged to have been negligent in the design of the intersection.

The central legal issues before the High Court were whether the design of the intersection by the RTA constituted a cause of the collision, and whether the Court of Appeal had erred in its approach to determining causation. Specifically, the High Court considered whether the Court of Appeal had correctly applied the "but for" test and other considerations relevant to contested questions of causation, particularly in reversing the primary judge's conclusion that the RTA's actions did not cause the accident. The Court also examined whether the Court of Appeal had fulfilled its duty to conduct an appeal on disputed questions of fact by reaching its own independent conclusion, and whether it had given undue weight to the advantages enjoyed by the primary judge in assessing witness credibility and factual findings.

The majority of the High Court found that the Court of Appeal had erred in its assessment of causation. They reasoned that the primary judge's conclusion that the accident was not caused by the RTA's negligence was open to him on the evidence. The majority emphasised that the plaintiff, from his stationary position, was undoubtedly able to see the defendant's vehicle approaching. Evidence from the defendant and other witnesses indicated that the plaintiff's vehicle had begun to move out before the collision. The majority concluded that no error of law or other error affected the approach of the Court of Appeal, and that there was no warrant for their intervention.

Consequently, the High Court allowed the appeal with costs, setting aside the orders of the Court of Appeal and ordering that the appeal to that Court be dismissed with costs. This decision effectively reinstated the primary judge's verdict in favour of the Roads and Traffic Authority.