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Network based indicators for prioritising the location of a new urban transport connection: Case study Istanbul, Turkey

Gavu, Emmanuel Kofi (2010) Network based indicators for prioritising the location of a new urban transport connection: Case study Istanbul, Turkey.

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Abstract:The city of Istanbul in Turkey is divided by the Bosphorus strait which currently has two suspension toll bridges. Recent population increases has brought immense pressure on the bridges in terms of containing the flow of traffic. There are therefore plans by city authorities for additional connections to improve traffic flow. Key among these improvement proposals is the third bridge location over the Bosphorus strait. Five options have been tabled and there is the need to decide on one of these choices. This research considers three of these options located within the old municipal boundaries of the city, where most congestion occurs. To address the issue, the aim of this research is to operationalise network indicators that can be used to prioritise the location of a new transport connection. Current indicators to measure network performance do not always consider network structure analysis. The main idea is that some transport connections are more important than others and that the relationship can be realized from analyzing the structure of transport networks. To do this, graph theory indicators of alpha, gamma, beta and space syntax parameters are explored at different degrees of network aggregation. Another method of assessing networks is by the traditional Volume to Capacity (V/C) ratio; this is also used to evaluate traffic conditions on the existing and proposed network improvement options over the Bosphorus. The results show that indicators such as the alpha, gamma and beta at various aggregation scales are too much aggregated and could be used with other indicators like the space syntax measures to obtain meaningful results. The space syntax parameters of local and global integration were used to show effects of additional network connection on indicator performance. It was realised that with addition of a new connection, global integration values for areas around the first bridge increase. The V/C ratio will be used to correlate results from space syntax parameters to analyse whether similar patterns are realised. Conclusions from this work will determine whether graph theory measures are useful indicators in this kind of decision problem or whether a combination with demand and supply based indicators like the V/C are the most appropriate. As a result, the most effective new connection will be suggested. Key words: Bosphorus strait, Congestion, Alternatives, Indicators, Transport model
Item Type:Essay (Master)
Faculty:ITC: Faculty of Geo-information Science and Earth Observation
Programme:Geoinformation Science and Earth Observation MSc (75014)
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