A case study on roundabout capacity and its efficiency at Kota Samarahan
Modern Roundabouts are very typical design of intersections used in Sarawak. At a very high traffic flow, roundabouts will fail when the traffic demand is exceeding its designed capacity. Thus, this project aimed to determine the capacity of the roundabout using two most popular methods, namel...
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| Main Author: | |
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| Format: | Final Year Project Report / IMRAD |
| Language: | en |
| Published: |
Universiti Malaysia Sarawak, (UNIMAS)
2006
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/47685/1/Iswandy%20ft.pdf http://ir.unimas.my/id/eprint/47685/ |
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| Summary: | Modern Roundabouts are very typical design of intersections used in
Sarawak. At a very high traffic flow, roundabouts will fail when the traffic
demand is exceeding its designed capacity. Thus, this project aimed to determine
the capacity of the roundabout using two most popular methods, namely Highway
Capacity Manual (HCM) Gap acceptance Method and Linear Regression Based
Method, UK. Gyratory 4, which is located at Kota Samarahan was selected as the
study site. Traffic volume studies were conducted at the selected study site to
obtain the required data for further analysis. From the results obtained, the two
methods used showed a quite considerable differences in the outputs. Generally,
based on the observation made during the traffic volume data collection, the
outputs of UK Empirical method produced a more reliable results compared with
HCM Model. By using UK Linear Method, only one arm (7th Mile) exceeds its
operational capacity (0.88). Whereas in HCM, v/c ration of right lane for two
arms, namely 7`h Mile (5.02) and Serian Road (5.06) produced the highest value.
These results are clearly indicated that the roundabout has failed to serve the
current traffic demand, which are not true when compared with the actual
observed operational capacity. Subsequently, some potential solutions are
addressed in this report to be adopted to mitigate the existing situations. |
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