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The aim of this study is to understand the reasons behind the mode choice preferences of passengers using a public transport transfer center. For this aim, a questionnaire data obtained at an interim transfer center in Istanbul is utilized. This interim center hosts stops for paratransit, bus and metro modes. A multinomial logit model of modal preferences is estimated and the coefficient results of this model are used to analyze and compare modes.

Application of sustainable transportation policies for resolving the transportation problem of Istanbul that has a population of 14.7 million in 2015 is of vital importance. This study focuses on economical and social goals of sustainable transportation by researching the relationship between urban accessibility, affordability and the transportation system. The purpose of this study is to investigate the combined role of affordability and accessibility and to introduce an accessibility measure to compare different transportation infrastructure schemes in Istanbul. For this purpose, the accessibility has been measured by means of a joint logit model. The main outcomes have been shown on an accessibility map and an elasticity analysis has been presented for different user groups. It has been concluded that accessibility is much higher in the central areas and decreases in the outskirts of the city. Results of the joint logit function have indicated that the effects of gender, income and car availabilities on mode choice are significant. The elasticity analysis has shown that mode choice decisions of car users are not sensitive to the transportation cost.

Istanbul is the major city of Turkey and is a typical large urban settlement facing serious problems of transportation. Amongst the others, Istanbul is unique in a way that the Istanbul Strait (Bosporus Strait) separates the metropolitan area into two main land areas creating a bottleneck and crucial traffic problems along a very strategic corridor between the two continents, Asia and Europe. The construction of the First Bridge (1973) and the Second Bridge (1988) and their beltways have highly influenced the travel and spatial development patterns in the city. Besides, the two Bridges have long been one of the main sources of traffic problems and a number of infrastruture developments, under construction or planned, will be provided for the allevaition of the congestion across the two sides of the city. However, there is an increasing call for better policy integration and evaluation in order to better fit with the aims of sustainable mobility. In this policy sense, this paper discusses the past and current policies concerning the Istanbul Strait crossings which is a very special case of urban planning and policy making practices.