Four pedestrians waiting at a Tsing Yi bus stop were injured, two critically, when a container truck mounted the kerb and crashed into them yesterday morning. Witnesses said the 53-year-old truck driver, identified only as Mr Law, appeared to have fallen asleep when his vehicle mounted a narrow footpath near Ching Wah Court. The truck skidded 24 metres before stopping, knocking down the four pedestrians, metres of railing and a fire hydrant. The driver had been travelling south in the slow lane along Tsing Yi Road West, one of the busiest routes to the airport, when the accident happened at about 9.30am. Two men, a Mr Wong, 21, and Mr Sze, 39, were fighting for their lives at Princess Margaret Hospital last night. A 43-year-old woman surnamed Yip was in serious condition and a man surnamed Lo was stable. Police said the driver passed a breath test and that investigations would focus on the speed of the vehicle and its mechanical condition. They said they could not comment on witnesses' reports that the driver had fallen asleep. 'It's a rare case,' Senior Inspector Kiang Kwok-ming from the New Territory South traffic unit said. 'We are looking into if anyone was speeding or there were mechanical malfunctions.' Kwai Tsing district councillor Ting Yin-wah said the narrow pavement was partly to blame for the injuries. 'If the pavement's width was two or three metres, it might have been avoided as commuters might have had a better chance to escape, but it's just one-metre wide.' A woman who regularly commutes from the bus stop said the pavement was still too narrow despite efforts to widen it. Reports that the driver had fallen asleep raised concerns about the long hours worked by truck drivers. Medium and heavy truck concern group chairman Lai Lim-tak said more than 20 per cent of the 20,000-odd truck drivers in the city worked more than 16 hours a day, as cargo orders were flooding in before the Lunar New Year. 'Sometimes they drop off the containers in the terminal and start right off to fetch another one without breaks,' he said. Bus operators are required to give drivers a rest after six hours and the drivers are not allowed to work more than 11 hours a day, but there are no such rules for goods delivery companies. And such companies 'will definitely oppose an extension of the policy into their industry because that implies less time for work and lower income', Mr Lai said.