The Ministry of Roads has improved roads in Nairobi, including reducing traffic congestion.

Important ones include Processional, Mbagathi, Juja, Nairobi-Ruiru-Thika roads and the 22km from Jomo Kenyatta International Airport through Uhuru Highway.

Work is underway on the Eastern and Northern bypasses and Nairobi-Thika high way (50km). Other roads in the city are being improved under the Nairobi Roads Project at a cost of Sh2.4 billion ($30 million).

The construction of Jomo Kenyatta International Airport (JKIA) road included expanding the Museum Hill Road up to Gigiri (UNEP headquarters), street lighting and traffic lights at a cost of Sh2 billion ($25 million). An extra lane was added between JKIA and Nyayo Stadium and Runda Whispers Bridge constructed.

Upgrading works of the Nairobi-Thika highway involve expansion to eight lanes as well as construction of interchanges at six locations to replace roundabouts. The project  also involved improvement of major arteries — Outering, Ngara, Murang’a and Forest roads linking Pangani to Uhuru Highway as well as rehabilitation of drainage and bridge Construction .

In Nairobi, four bypasses are under construction. When completed, they will ease traffic congestion in the city. The Eastern bypass (40km) starts at City Cabanas, passes through Ruai and ends at Ruiru. Sections of this bypass are already motorable. The Southern bypass (30km) starts on Mombasa road near the former American Embassy unit ends on Naivasha Road after Kikuyu town. The Northern bypass (25km) starts after Ruaka trading centre on Limuru Road, passes through Runda and joins the Eastern bypass ending at Ruiru. The 20km Western bypass (link road) connects the Northern and southern bypasses through Westlands.

The Chinese government is funding the construction of the Northern and Eastern bypasses under a design-and-build arrangement at a cost of Sh8.6 billion ($107.5million). The EU, Chinese, Japanese governments have interest in funding the Western bypass. The Government is looking for funds to build the Southern. Plans are underway to improve and expand Outering and Ngong roads.