At least 34 passengers were Thursday morning injured after a bus they were traveling in rolled into a ditch along the Muhoroni-Londiani highway, Kericho County.
Police said one of the passengers suffered a miscarriage.
She is stable in hospital, police said.
The accident happened at about 3 am on Thursday.
Rift Valley Regional Police Commander Tom Odera told the media the bus had originated Nairobi and was headed for Busia.
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He said the victims were evacuated from the scene and rushed to hospital with multiple injuries.
The driver of the bus said he was trying to avoid hitting a car that was ahead of him after it applied emergency breaks as they drove the stretch.
This forced his bus to veer off and roll into a ditch, he said.
The incident happened at Tunnel Centre, which is among places regarded as blackspot for accidents.
The injured were rushed to Fort Ternan Hospital.
This comes in the wake of a campaign to address accidents in the country ahead of the festive season.
Police say they have mounted a campaign with other stakeholders to ensure minimum accidents.
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