Assessment of Traffic Congestion Analysis Measures in Addis Ababa City (A Case Study of Mexico Square to German Roundabout Road Segment)
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Date
2024-06
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Addis Ababa
Abstract
One of the most prevalent issues with urban transportation systems is traffic congestion. When
there is a disruption in the regular flow of traffic, it leads to a decrease in speed, a delay in travel,
and a substandard quality of service, this is known as traffic congestion.
Depending on the causes, traffic congestion can either be recurrent or non-recurrent. Recurrent
congestion is brought on by transient signal changes, capacity violations, and excessive traffic
demand. On the other side, unusual events like work zones, severe weather, and other
occurrences could cause non-recurring congestion. Numerous methods for evaluating traffic
congestion have been devised, taking into account various factors such as speed, travel duration,
frequency of delays, quality of service, and other congestion indicators. The level of service
method and travel time-based measurements, which are the two categories into which the
already existing congestion measures were divided, then examined within this research.
The road segment Mexico square – German roundabout was chosen from the city’s core area
and three road sections were selected from this segment to achieve the stated objective. The
relevant data was manually collected by the researcher from selected segments, utilizing
equipment appropriate for the study's objectives. The results showed the travel time based
measures showed variations in the congestion state while indicating a similar congestion trend
during peak and Off-peak hour for the Africa union – Pushkin square and Mekanisa Abo –
Mekanisa road sections while showing a uniform congestion state for the Mekanisa – German
Roundabout Road section. The capacity for the level of service was modeled using three traffic
flow models, the Greenshields, Greenberg and Underwood model. The result indicates the
underwood model better explained the data compared to the other two models. And, the
advantages and disadvantages of the measures used have been discussed from the results.
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Keywords
Traffic Congestion, German Roundabout, Road Segment