A Singaporean man, 25, was killed in an accident on the Pan-Island Expressway in the direction of Changi, after the Central Expressway exit near Upper Serangoon Road, yesterday. The crash involving his motorcycle and a truck occurred around 4.30pm, said a police spokesman. The motorcyclist was pronounced dead at the scene. The truck driver, a Malaysian aged 50, was arrested for causing death by a negligent act, and police are investigating. The Straits Times understands that there were no passengers. The accident caused a jam that at one point reached Bukit Batok. Traffic began to ease only after 8.30pm.