A man was killed and his three colleagues injured - two critically - when their car mowed down four concrete poles and smashed into a lamppost in Yuen Long yesterday. Front-seat passenger Yip Chik-lam, 43, a father of four, was thrown out of the car as its roof was ripped off in the 4am crash on Town Park North Road. Police said he died instantly. Two back-seat passengers - Yip Kam-kin, 24, and Wong Chun-yin, 20 - had to be freed from the wreckage by firefighters. Last night, the two men were in critical condition in Tuen Mun Hospital. Driver Law Wai-lun, 20, who survived without serious injury, managed to climb out. He was arrested for drink-driving and driving without a licence. It is understood that Law took control of the wheel as Yip Chik-lam, who had been driving, had been drinking heavily in a Yuen Long pub. The four men were believed to have worked in a marble tombstone factory. Police said preliminary investigations showed one of the wheels of the car mounted the footpath and it hit the poles. 'The car then slammed into a lamppost, which peeled off the left car-body and roof,' a police investigator said. Officers from New Territories North traffic unit were investigating the cause of the accident and whether the car was travelling above the 50km/h speed limit. The unlicensed driver was released on $5,000 bail. He has to report to police next month. Police asked witnesses to contact them on 2455 4221 or 2455 4224.