Transport Cabinet Secretary Davis Chirchir in a past event/COURTESYThe Rironi-Naivasha section of the Rironi-Mau Summit highway is expected to be completed and opened to traffic by October 30, Roads and Transport Cabinet Secretary Davis Chirchir has said.
Chirchir said the ongoing works on the section were progressing well and motorists would soon begin using the upgraded road.
“In one and a half months to come, the section of Rironi to Naivasha Road of Rironi-Mau Summit construction will be complete,” Chirchir said during an interview.
He said once the Rironi-Naivasha section is completed, the government will shift focus to the remaining sections of the corridor, including the Rironi-Mai Mahiu-Naivasha road.
According to the CS, the plan is to first open the upper side of the A8 corridor to traffic before proceeding with works on the A8 South section as the works on the stretch to Mau Summit continues.
“After this we go to Naivasha side, that is Rironi-Mau Mai Mahiu-Naivasha. We'll open the upper side, that is A8, to traffic, then go to A8 South,” he said.
Chirchir said the government expects the entire corridor to be completed by June 2027, paving the way for improved movement between Nairobi, Naivasha and the western part of the country.
“By June 2027, that whole corridor will be complete,” he stated.
The Rironi-Mau Summit corridor is a key transport route linking Nairobi with the Rift Valley and western Kenya and is heavily used by motorists transporting passengers and goods.
President William Ruto launched its construction on November 28, 2025.
The project is valued at approximately Sh170 billion to Sh 183.7 billion and implemented through a Public-Private Partnership (PPP) involving the China Road and Bridge Corporation (CRBC) and NSSF.
The scope of work covers Phase I of the Nairobi–Nakuru–Mau Summit (A8) and Nairobi–Maai Mahiu–Naivasha (A8 South) corridors.
It upgrades the existing two-lane section between Rironi and Naivasha to four lanes, and later Naivasha to Mau Summit to six lanes.
The project is expected to improve traffic flow and reduce congestion along the busy Nairobi-Nakuru highway, while also enhancing road safety and reducing travel time.
The Rironi-Naivasha section has been undergoing upgrading as part of broader efforts to improve the northern corridor and provide additional road capacity along the route.
Once the section is opened, motorists will have access to the completed portion as construction continues on other parts of the corridor.
The phased approach is intended to allow completed sections to be put into use instead of waiting for the entire corridor to be finished.
The June 2027 target for completing the wider corridor is expected to provide motorists with a fully upgraded route between Rironi and Naivasha and onward connections through the Mau Summit corridor.
The project is part of the government's wider investment in road infrastructure aimed at easing congestion on major highways and improving the movement of people and goods across the country.
