Kiambu County residents have reason to celebrate today as President William Ruto’s Cabinet approved the dualling of the 23.5-kilometre Pangani–Muthaiga–Kiambu–Ndumberi road, a long-overdue upgrade that promises to end the daily traffic nightmare for thousands of commuters heading to and from Nairobi.
If the previous tender document (KeNHA/2889/2025) is the one to be used—as widely expected since no new design has been announced—the narrow two-lane B32 will become a modern four-lane dual carriageway with two-lane service roads on both sides and continuous pedestrian walkways. Six footbridges will make school runs and market trips far safer in busy areas like Ridgeways, Thindigua, and Kiambu Town.
The upgraded main trunk road will run in three clear sections: Muthaiga to Kirigiti Junction; Kirigiti Junction through Kiambu Town to the Governor’s Office; and Governor’s Office to Ndumberi–Sasini. The route starts at Pangani near Thika Superhighway, passes Muthaiga Golf Club, Ridgeways, Runda, Windsor, Thindigua, enters Kiambu via Kirigiti Junction, touches the Governor’s Office area, and ends at Ndumberi near Sasini Estate. New bridges and overpasses will rise at Muthaiga Golf Club Spur, Mua Road, DCI, Coffee Garden, Tala Road, Ridgeways U-turn, Runda U-turn, and Kirigiti Junction, while full interchanges at Kamiti Road, Banana Road, and Northern Bypass will keep traffic flowing without endless stops.
Heavy through-traffic will largely avoid the busiest parts of Kiambu Town centre thanks to two dedicated bypasses: Githunguri Road–Sasini–Boma Road and Riabai–Kiriguini B Road. These routes will divert long-distance vehicles away from markets, matatu stages, and narrow streets, reducing congestion in the town centre while service roads maintain local access.
Several feeder roads will also be upgraded, including Ridgeways Road from Kiambu Road to Thika Road (Roasters), Evergreen–UN Avenue through Runda, Wambui Road, Muthaiga North, Mua Park Road/Serengeti Avenue, KIST Junction to Kamiti Road, Junction Boma Road to Kirigiti, and links to public institutions and key settlements. These improvements will include new pavements, street lighting, and bus bays.
The project is financed through a Sh38.7 billion loan from China EXIM Bank and will be delivered under an Engineering, Procurement and Construction (EPC) contract. Works are scheduled to take 36 months, with a 24-month defects liability period to follow. KeNHA has committed to keeping the existing road operational during construction and to managing traffic diversions, though motorists should anticipate dust, noise, and temporary delays, particularly in Ridgeways and Kiambu Town areas.
Once complete, the expanded highway is expected to cut travel times to Nairobi, reduce pressure on Thika Superhighway, improve road safety for pedestrians, and enhance connectivity for businesses and farmers in Kiambu County.
