Analysis of the Parameters of Transfers in Rapid Transit Network Design

The rapid transit network design problem consists of the location of train alignments and stations in an urban traffic context. The originality of our study is to incorporate into the location model the decisions about the transportation mode and the route, to be chosen for urban trips. This paper proposes a new design model which includes transfers between train lines. The objective of the model is to maximize the number of expected users in the transit network taking limited budgets into consideration, in addition to location and allocation constraints. Furthermore, the transfer costs are considered in the generalized public costs when the users change lines. Waiting time to take the metro and walking time to transfer is included in the formulation of the costs. The analysis of transfer parameters is carried out using a test network. Some computational experience is included in the paper.Ministerio de Fomento 2003/1360Ministerio de Ciencia y Tecnología BFM2003-04062/MAT

A Rapid Transit Network Design Model . . .

In this paper we propose a model for the problem of designing a rapid transit network which includes transfers. Our objective is to maximize the number of expected users in the transit network taking limited budgets into consideration. Additionally, the existing competition between private and public modes is assumed when the generalized cost for the user trips is calculated. Some computational experiment with the model is provided

Metaheurística GRASP para el diseño de redes de tránsito rápido

En este trabajo se presenta un procedimiento heurístico GRASP para el problema del diseño de redes rápidas de transito (Rapid Transit Network Design Problem, RTNDP). El problema RTNDP consiste en determinar las líneas y la localización en ella de las estaciones de una red de tránsito rápido. Para establecer el diseño óptimo se tienen en cuenta algunos criterios relevantes como el coste de la inversión necesaria o el uso futuro de la red. Las alternativas se analizan a partir de la demanda de trayectos, de la distribución de trayetos, de los modelos de elección de los usuarios y del equilibrio del trá co. La metaheurística GRASP proporciona las pautas para diseñar un proceso constructivo adaptativo para obtener las líneas que forman la red. La heurística es contrastada frente a la aplicación de un optimizador comercial basado en su formulación como un problema de programación lineal enteraMinisterio de Educación y Ciencia BFM2003-04062/MATEMinisterio de Fomento 2003/136