Thesis Open Access

Turbo Roundabout as an Alternative of conventional Roundabou : Case study at Africa union Intersection

Mahlet Yegizaw


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    <subfield code="a">Melaku Sisay ( PhD )</subfield>
    <subfield code="u">Addis Ababa Science &amp; Technology University</subfield>
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    <subfield code="a">&lt;p&gt;Addis Ababa is experiencing rapid growth in the business and construction activities&lt;br&gt;
which in turn increase the number of vehicles with an alarming rate. For this reason,&lt;br&gt;
currently there is an attempt to develop infrastructures like road networks improvement and&lt;br&gt;
evaluation and improving intersection control mechanism in the city. But still there is a&lt;br&gt;
huge gap in developing road segment and intersection with good operational and safety&lt;br&gt;
performance. The introduction of the turbo roundabout in Addis Ababa can have a&lt;br&gt;
massive impact on the road safety and capacity problem in the city.&lt;br&gt;
In this study the roundabout at Africa Union intersection was modeled using VISSM&lt;br&gt;
software and proposed and designed Turbo roundabout using Torus software as an&lt;br&gt;
alternative solution in terms of operational and safety performance.&lt;br&gt;
Traffic volume is a major input, motorized Traffic data was collected in morning and&lt;br&gt;
night time peak hour for 2 consecutive days from 8:00am to 9:00 am in the morning&lt;br&gt;
and from 5:30pm to 6:30pm for night peak hour. The hourly traffic volume distribution&lt;br&gt;
revealed that the peak hour traffic between 8:00am to 9:00 am in the morning.&lt;br&gt;
Pedestrian volume count was used from secondary data of previous study on each&lt;br&gt;
approach that cross the road on both directions in-bound and out-bound to the approach.&lt;br&gt;
Then both existing and proposed intersection operational performance analysis is&lt;br&gt;
conducted using VISSIM software.&lt;br&gt;
The results showed 85sec delay and 80m queue lengths with F LOS. As an alternative&lt;br&gt;
solution reconstruction of the intersections has been made into Rotor turbo roundabouts&lt;br&gt;
and results revealed the intersection better performance with 32 sec delay, 34m queue&lt;br&gt;
length with D LOS. Finally, the performances for two types of roundabouts are&lt;br&gt;
determined with the using VISSIM software.&lt;br&gt;
The analysis has proven that with the input parameters, rotor turbo roundabout offers&lt;br&gt;
better performances and safety improvement compared to the existing intersections as&lt;br&gt;
it can be taken as an alternative solution.&lt;/p&gt;</subfield>
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    <subfield code="c">2020-07-30</subfield>
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    <subfield code="a">Conventional Roundabout, Turbo Roundabout, Operation, Capacity, Safety</subfield>
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    <subfield code="a">Mahlet Yegizaw</subfield>
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    <subfield code="a">Turbo Roundabout as an  Alternative of  conventional  Roundabou :  Case study  at Africa union Intersection</subfield>
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