Four people died on the spot on Monday after a 14-seater matatu rammed into a 60-seater bus at the Hill Tea area along the Eldoret-Nakuru highway.
According to a police report, the tragic incident occurred at around 5.00 am when the matatu en route to Nakuru collided head-on with the bus full of passengers.
The driver of the matatu, which was carrying 16 people at the time of the accident, died alongside three other passengers.
Nine other passengers who were seriously injured were rushed to Eldama Ravine Sub-County Referral Hospital for treatment.
Meanwhile, the bodies of the deceased were moved to the same facility.
"The National Police Service urges motorists and all other road users to exercise extreme caution while on the roads, especially during this rainy season," read police statement in part.
Police recorded the incident less than a day after 12 people died and 8 others were injured along the Kikima-Machakos Road in Mbooni, Makueni County.
An eyewitness who spoke to the press on Saturday attributed the accident to a brake failure while the driver was attempting to negotiate a corner.
Mbooni West Deputy County Commissioner Stanlas Apwoka confirmed the tragedy adding that the 14-seater matatu was carrying excess passengers.
Makueni Governor Mutula Kilonzo later condoled with the families of the deceased, vowing to offer full aid to those injured in the accident.
"To those who have lost their loved ones and their family members, on behalf of my family and me as well, I express my sympathy and for those who are nursing injuries will ensure that they receive treatment fully," noted Mutula Kilonzo Jr.
"I want to take this opportunity to caution drivers, especially during this rainy season and festivities, against carrying excess passengers."
National Transport and Safety Authority (NTSA), the police, and Interior Principal Secretary Raymond Omollo, in separate advisories, urged road users to exercise caution while driving during the December festivities.