SINGAPORE: A 37-year-old man was killed on Monday morning (Dec 19) after another driver allegedly went against the flow of traffic on the Ayer Rajah Expressway (AYE) in the direction of Tuas. The incident, which occurred near Tuas West Road, caused a multi-vehicle collision involving four cars, a motorcycle and a bus, according to the police. The man was trapped in the driver’s seat of his car, and had to be extricated by Singapore Civil Defence Force (SCDF) personnel using hydraulic rescue tools.He was pronounced dead at the scene. Channel News Asia understands that the accident took place after the other driver made a U-turn and went against the flow of traffic. A 53-year-old man has been arrested for causing death by a rash act, the police said, adding that investigations are ongoing. The penalty for causing death by a rash act is up to five years in prison, a fine, or both.SCDF said it was alerted to the accident at about 8am, and dispatched four ambulances, a fire engine, a Red Rhino, two fire bikes and a support vehicle. Two men and two women, aged between 34 and 53, were taken to National University Hospital with unknown injuries. The SCDF said it alerted the hospital to be on standby to receive those injured.