Five people believed to be from the same family died Sunday afternoon when the vehicle they were travelling in collided head on with bus.
The accident happened near Longisa High School in Bomet county on the Bomet-Narok highway.
Three children aged between 11-15 and the father died on the spot while a girl died while undergoing treatment at Tenwek Hospital.
Bomet county traffic base commandant Daniel Kameta said the driver of the bus attempted was overtaking a matatu at a sharp corner when he saw the oncoming Salon car.
"The car was speeding downhill when the two collided head on," he said.
"Two women survived. One of them is believed to the children's mother. They are responding well to treatment at Tenwek Hospital."
The bodies were taken to Longisa Hospital mortuary.
Kameta urged motorists to be cautious while driving in the area.
He said although the number of accidents has reduced, there is need for drivers to be followe traffic rules.
Meanwhile, two boda boda riders are admitted to Tenwek Hospital after their motorcycle was involved in an accident near Kyogong Secondary School.
The boda boda rider tried to overtake a car.