Two teenagers have died after the petrol-powered trail bike they were riding crashed into a bus on a restricted transitway in Sydney's west, with the mayor saying he had feared such a tragedy following recent near misses on the road. NSW Police say the 15-year-old rider and his 14-year-old passenger were riding the petrol trail bike on Liverpool Parramatta Transitway, known as the T-Way, at Bossley Park just after 7pm on Monday.