Scopus İndeksli Yayınlar Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12573/395
Browse
2 results
Search Results
Article Spatial Proximity and Accessibility Patterns of X-Minute Cities(Elsevier Ltd, 2026) Östh, John; Türk, Umut; Kourtit, Karima; Nijkamp, PeterThe 15-minute city concept has gained prominence in urban planning as a framework linking proximity, mobility, and quality of life at the intra-urban scale. An open question is whether this concept remains meaningful when applied to spatially connected urban regions or national urban systems. To address this issue, the new X-minute city concept allows proximity thresholds to vary with spatial context, mobility conditions, and service distribution. This paper develops an operational framework with the aim to examine and highlight spatial accessibility patterns from an X-minute city perspective, using the relatively urbanized area of the Netherlands as a national-scale case study. Accessibility is analyzed at the building level using OpenStreetMap data and a combination of object-based k-nearest-neighbor measures, distance-decay functions, inequality metrics, Average Nearest Neighbor analysis, and quantile regression. Concepts from central place theory are employed as an interpretive lens to understand service clustering and accessibility patterns, rather than as a formal model to be tested. The results show pronounced spatial disparities in accessibility between urban and rural areas, as well as substantial variation within cities. Major urban centers such as Amsterdam, Rotterdam, and Utrecht exhibit high accessibility levels due to dense service provision, while peripheral and rural areas face systematically lower accessibility. Next accessibility outcomes also differ sharply across population groups. Elderly residents and groups reliant on walking experience the highest levels of inequality, with accessibility distributions remaining highly uneven at short-distance thresholds. Cycling expands the range of effective activity spaces and reduces inequality, but does not offset structural disadvantages in areas with sparse service provision. The findings point to the limits of uniform proximity targets and reveal the need for context-sensitive accessibility planning that explicitly accounts for service distribution, mobility constraints, and population heterogeneity within national urban systems.Article Citation - Scopus: 2Impact of High Speed Railway Systems on Inter-Regional Trips and Accessibility in Turkey(Istanbul Teknik Universitesi, Faculty of Architecture itudergisi@itu.edu.tr, 2020) Baş, Ahmet; Yüzer, Mehmet AliHigh-speed trains are faster, safer, more comfortable than road transport for trips of 250–1000 kilometers. Accordingly, a significant increase has been observed in inter-city railway transport following the construction of high-speed railway (HSR) connections. The present study shows the effects of HSR on accessibility and potential savings in time when compared to other transportation modes. The time saved by HSR systems has been shown to change purpose trip. The level of accessibility provided by the HSR between Konya–Ankara–Istanbul link is compared with the accessibility of other travel modes through an investigation of the weighted average travel times and an analysis of costs. Furthermore, data gathered from a field study carried out among users of the Konya-Ankara HSR link is used to identify the distribution of travel choices among different transportation modes, based on such social and economic indicators as income, car ownership and employment status. It is found that HSR service increases accessibility between cities, and changes travel demands and purpose, in favor of railways, and that economic factors such as income and car ownership are important in the use of HSR services. Finally, this research identifies social and cultural activities as a new reason for travel, in which users diversify their travel destinations because of the time savings offered by HSR systems. © 2020 Elsevier B.V., All rights reserved.