Four persons, including two women, were injured when 17 vehicles collided with each other in the 23.3 km Kalutara area on the Southern Expressway, the Southern Expressway Police said.
Luxury cars, vans and lorries were among the vehicles involved in the accident, police said.
The road leading to Dodangoda was congested for several kilometers due to the accident and the vehicles were evacuated within a few hours and traffic was restored to normal, an official of the Road Development Authority said.
According to the police, the accident had taken place when a van traveling in front had applied the brakes and the other vehicles in the rear had applied the brakes in the same manner.