Haluk GERCEK – Istanbul Technical University, Istanbul, Turkey
An ideal network design approach has to consider many details of the planning process simultaneously to yield optimal results. However, this is usually not possible due to the computational complexity. Mathematical programming approach is often limited to small networks. This study proposes a decision support model (DSM) in order to phase a citywide bicycle network plan integrated with the public transport system in Istanbul Metropolitan Area. The role of bicycle as a non-motorized transportation, and its contribution to sustainable travel goals are first presented. Secondly, layers of data produced for the GIS mapping regarding the public transport routes planned for the target year 2023, locations of transfer centers, public transport travel demand at each transfer center, and a revised citywide bicycle network are explained. The proposed bicycle network was decomposed into 14 clusters that consist of areas around the transfer centers that are accessible within 15 minutes bicycle travel time.
A survey was carried out with 42 transportation planning experts to collect data about the weights of the criteria and sub criteria considered to prioritize the clusters by using the Analytic Hierarchy Process (AHP). AHP is a multi-criteria decision-making procedure that contains both qualitative and quantitative critera defined at several levels. The relative weights of criteria and sub criteria were calculated by pairwise comparisons. A sensitivity analysis was also included to examine the impacts of different criteria on the priorities of the network clusters. The DSM is intended to assist the municipality departments in prioritizing bicycle improvements, and help guide the implementation of the citywide bicycle network plan prepared by the municipality.