One person was killed and four others sustained injuries, when the van they were travelling in collided head-on with a container lorry near Avudangawa in Sigiriya.
The injured were admitted to the Dambulla Base Hospital.
The victims were identified as employees of a famous wedding decor company, who were returning to Kandy from a wedding held in the Sigiriya area.
Initial investigations revealed the van driver had fallen asleep when the accident had occurred, Sigirya Police said.
The deceased has been identified as a 36-year-old resident of Dambulla.