At least 30 persons were killed and dozens injured in a road accident on a major highway in west Kenya on Sunday.The accident occurred at dawn when a bus and a trailer collided at a known black spot on the Nakuru-Eldoret highway, Xinhua news agency reported.Police said the bus was carrying passengers to Nairobi from the border town of Busia, and the trailer was heading to the town of Eldoret in northwest Kenya.Gideon Kibunja, the Rift Valley Head of the Directorate of Criminal Investigations, said 28 bodies were found from the wreckage of the bus at the scene, while another two were retrieved from the trailer.