PERFOMANCE ANALYSIS OF NAIROBI EASTERN BYPASS Nairobi Eastern Bypass Capacity and Level of Service Study


The continued increase in the number of motor vehicles in Kenya has led to great congestion on our roads, especially in the capital city Nairobi. The number of cars accessing Nairobi streets is rising by the day and this has led to major traffic snarl ups, as well as an  increased number of accidents. These congestions are especially common on the highway comprising of Mombasa road, Uhuru Highway and Waiyaki Way, which is the main highway going through the city of Nairobi. Vehicles with no business in the Central Business District have for a long time been forced to use Uhuru Highway for lack of an alternative route. The congestion led to Kenya National Highways Authority designing and constructing alternate routes for such vehicles. Thus the inception, construction and operation of the three main bypasses around Nairobi, which are the Eastern, Northern, and Southern Bypasses.

 The Nairobi Eastern Bypass project is a project that was started back in January 2011 and completed in May 2012. This section of the bypass starts from Mombasa road at the Cabanas interchange, passes through Pipeline and then Utawala and goes over Kangundo Road. The Eastern Bypass then proceeds all the way to the recently constructed Thika Super Highway. The total length of this section of road is 39km. The Nairobi Eastern bypass is an Asphalt Concrete pavement and is classified as a class B road.  The Nairobi Eastern bypass is a two lane, two way single carriageway that is 9 m wide and has an open channel earth surface drain on either side. The Eastern Bypass was constructed to help ease the traffic congestion along Mombasa Road, through Uhuru Highway and into Waiyaki Way. For the purpose of this study, the stretch from Thika Superhighway to the Kangundo Road junction will be considered.

The performance evaluation established the capacity of the road and traffic flow being handled by the road in vehicles per hour. The study also determined the level of service of the road. In order to achieve the above parameters, a field data collection and analysis was done. The findings of the study have been properly outlined in chapter 4, 5 and 6 of this report. The objectives, which were to determine the operational capacity and level of service of the Nairobi Eastern Bypass, were met.  In chapter 7 of this report, a number of recommendations have been forwarded based on the findings. Should these recommendations be implemented, then the problem of congestion on the road may be solved.