Extent of traffic shockwave propagation induced by midblock u-turn facilities
The aim of study is to determine the extent of traffic shockwave propagations induced by midblock U-turn facilities. Based on the hypothesis that shockwave would result from U-turning at midblock facility, 24 hour data were collected which is volume and speed at two sites in FT005 Skudai - Pontian h...
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| Pengarang Utama: | |
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| Format: | Thesis |
| Diterbitkan: |
2013
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| Subjek-subjek: | |
| Capaian Atas Talian: | http://eprints.uthm.edu.my/4578/ http://eprints.uthm.edu.my/4578/1/NURUL_FARHANA_JAILANI.pdf |
| Penanda-penanda: |
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| Ringkasan: | The aim of study is to determine the extent of traffic shockwave propagations
induced by midblock U-turn facilities. Based on the hypothesis that shockwave
would result from U-turning at midblock facility, 24 hour data were collected which
is volume and speed at two sites in FT005 Skudai - Pontian highway, Malaysia. The
two sites are denoted as site A and site B. The study of highway capacity is the most
important part in the identification of road performance. Any change made at the
roadway for example installing a midblock U-turn facilities would result in highway
capacity 1oss. There are mainly three causes of capacity loss which are due to the road
condition itself, due to ambient and due to the traffic operation. When capacity loss
happen, it would lead to traffic shockwaves. Traffic shockwave is a motion of
propagation of a change in density and flow.When shockwaves happen, it would lead
to reduction of roadway level of service. Speed, fow and density for with and without
midblock U-turn facility are estimated using Greenshields Model. All data was
collected using Automatic Traffic Counters (ATC). Shockwave velocity propagation
with and without midblock U-turn facility were estimated by determining and
comparing the capacity and density of roadway. Direct empirical capacity estimation
methods are use to estimate capacity of roadway. Results shows that there is
significant shockwave velocity propagation happen on the exit of the U-turn
midblock facility which is about -35.1 kmlhr. While a minor shockwave happens at
the approaching of the U-turn. This study concluded that midblock U-turn facilities
will induce traffic shockwave that may lead to road accidents. |
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