Assessment of Congestion and Performance Evaluation of Roundabouts on CMC-Megenagna Road
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Date
2020-07
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Addis Ababa University
Abstract
Traffic congestion is one of the major problems that is being faced by developed and
developing countries around the world. Addis Ababa being the capital city and the busiest city in
the country, traffic congestion is a common phenomenon in the day to day activity. This study
mainly focuses on assessing the traffic congestion by taking the road section from CMC to
Megenagna as a case study. This road section in one of the most complained road section by road
users. There are two roundabouts along the study road which are congested during the peak
hours of the day. The performance of the roundabouts was evaluated using SIDRA
INTERSECTION software as a tool. Also in order to see the level of congestion it is important to
quantify the traffic congestion. Travel time approach is used to measure the congestion intensity
and reliability.
The result showed that both roundabouts are performing below the satisfactory level in terms of
capacity and delay performance measures. High demand flow on one or two approaches, high
circulating flows and the existence of heavy vehicles during the peak periods contributed for the
poor performance of the roundabouts. Using this road in the morning peak hours causes a
traveler to spend 13.1 minutes per kilometer of delay on average and should reserve maximum
14 times the off peak travel time to reach on time
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Keywords
Roundabouts, Congestion, CMC-Megenagna road, performance evaluation