Police in Western Australia have appealed to Hong Kong drivers to be cautious when using the state's roads after a fatal accident involving a family from the city. A 50-year-old Hong Kong woman died and her husband and nephew were critically injured in the accident on Sunday afternoon in the south of the state. The family of 11 were travelling to Margaret River in two station wagons when one of the vehicles failed to take a bend on the Bussell Highway near Carbunup, about three hours south of the state capital, Perth. A police spokesman said the 53-year-old male driver remained in critical but stable condition in Sir Charles Gardiner Hospital in Perth. His 14-year-old nephew, who was airlifted to the children's wing of the city's Princess Margaret Hospital for emergency surgery, is also critical but stable. The family has asked that the name of the woman who died be withheld until her husband makes a full recovery. Most of the group, who began their Lunar New Year holiday in Perth on Friday, left Australia for Hong Kong yesterday afternoon. Police spokesman Mike Jones said officers did not believe alcohol or speed had caused the crash. The family left Perth at 9.30am on Sunday and had a two-hour break for lunch before starting the final leg of the drive. Senior Constable Jones urged overseas visitors to be aware of the driving conditions in the state. 'It is a concern to West Australian police that foreign nationals coming to the state don't realise the distances to places. It is important for drivers to take regular breaks.'