A 25-year-old Singaporean man was killed in an accident on the Pan-Island Expressway on Monday.

The mishap involving his motorcycle and a truck occurred at about 4.30pm on the highway towards Changi, after the Central Expressway exit, said a police spokesman.

The motorcyclist was pronounced dead by paramedics at the scene.

The truck driver, a 50-year-old Malaysian, was arrested for causing death by negligent act, and police investigations are ongoing.

The Straits Times understands there were no passengers in either vehicle.

The accident caused a massive jam that at one point stretched all the way to Bukit Batok.

Traffic began to ease only after 8.30pm.