A man suffered serious injuries after his high-powered Subaru rolled into power pole Emergency personnel treat a young man trapped in his car at Castle Hill. A MAN suffered serious injuries after a car he was driving rolled and struck a power pole at a busy intersection in Sydney's north west this afternoon. Ambulance paramedics and a trauma doctor from the CareFlight helicopter treated the man, in his early 20s, while he was still in the wreckage of his car at the corner of Old Northern and Castle Hill roads, at Castle Hill. The roof of the high-powered Subaru was crushed in the incident, hampering access for emergency personnel. CareFlight director Ian Badham said the helicopter had to land at a nearby oval. "It appears the car entered the intersection just before 3.30pm and rolled before hitting the pole," Mr Badham said. The driver was the only occupant and it appears there was no other vehicle involved. Mr Badham said the condition of the injured driver was stabilised by the doctor before he was taken to Westmead Hospital. Peak hour traffic was disrupted. Police reopened all northbound lanes on Old Northern Road just after 5pm