جستجوی مقالات مرتبط با کلیدواژه « bus network design » در نشریات گروه « عمران »

The most important issue that must be considered at the same time as the development of cities is the design and modification of the public transportation network, and the most important part of which is the design of the bus network. In the city of Mashhad, the creation of metro and BRT lines in the urban network, as well as population growth, have caused fundamental changes in the pattern of urban travel, and therefore it is necessary to modify the network of bus lines. The methods that have been presented to design the bus network have paid less attention to the implementation aspect, and their implementation in real and large-scale networks is very time-consuming. The main goal of this study is to provide an effective and practical method for designing the urban bus network. The method of this study is a combination of heuristic and meta-heuristic methods and is based on genetic algorithm. In order to apply this solution method and the possibility of its implementation for the city of Mashhad, programming in C++ environment was used, which provides the possibility of fast design of the bus network for different purposes and limitations. The output and results of this method were extracted for the city of Mashhad and the optimal bus network was compared with the existing network. The results showed that the demand coverage and other performance indicators in the proposed bus network have a significant improvement compared to the existing network.

Bus network design is the first step in urban transportation planning process, and due to its influence on the consequent steps, such as timetabling, vehicle scheduling and crew scheduling, this step plays an important role in the process of transportation planning. One of the important issues in transit network design is locating transfer points. However, in the previous studies this issue was not considered, and it has been only paid attention to optimizing parameters such as travel time. This study is focused on defining the location of transfer points, as a result of transit network design, such that transfers are performed in points with higher capacities. Applying the genetic algorithm, the presented methodology is implemented on a virtual network, and the results showed that considering transfer constraint affects defining the location of transfer points.

Bus transportation system is of the most important public transportation. Improvement of this system has a considerable effect on the efficiency of the urban transportation system as well as increasing passengers’ satisfaction and attraction. Consequently, this will result in energy saving and reduction in volume of traffic and environmental pollution. All the issues about bus network design including the optimal routing and the fleet size in each path are taken into account as a crucial issue in public transportation planning. These issues are so complicated that no exact solution can be found in real cases. This study attempts to introduce a method to find optimized path of the bus network in terms of passengers’ satisfaction through applying ant colony algorithm as a metaheuristic algorithm. The passengers’ satisfaction is assessed by an overall objective function which includes some desirable parameters such as the fulfilled (coverage of) demands, the path frequency, the network accessibility, the number of transfers and the traveled distance. In this paper, the Sioux-falls network is simulated in proposed model and the results are compared with the shortest path algorithm. The improvement in represented paths via proposed algorithm is remarkably evident compared with those from shortest path algorithm.

Urban bus transportation is one of the common public transportation modes, which has a significant position among all other modes. Any attempt in order to increase the effectiveness and desirability of this mode has a positive influence on the urban trips. Bus network design due to its considerable influence on the performance of this mode is of great importance. And various approaches have been proposed in this context, which have different advantages and disadvantages. Reaching the optimal network in the shortest possible time, considering the parameters which are in conflict with each other most of the time, is the main reason of the complexity of bus network design problem, and makes constraints for the designers. The present paper proposes a heuristic approach for solving bus network design, which is based on graph theory. The proposed methodology designs bus network in two steps of route generating and route selection. For the evaluation purpose, this method compared to other heuristic methods. The results showed that the proposed method outperforms the other existing heuristic network design methods