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In this paper we analyse the role of walking accessibility to transit facilities. Microdata and GIS tools have been used to calculate distances walked by different population groups in accessing Metro stations. Distances walked by the population were used to determine the threshold distances of the station service areas and calculate the population covered by the Metro network. With respect to Metro ridership, different distance-decay functions were adjusted and the sensitivity of the population groups to the distance was measured. Two indicators were proposed, based on the distance-decay functions, to measure access quality and potential demand. The Madrid Metro network was used as the study area. Results show that young people and adults, men, immigrants, and public transit captives are willing to walk longer distances and are less sensitive to the effect of distance. When walking distances have been used in order to fix the limit of catchment areas, the amount of the population covered is lower than when a standard threshold (0.5 miles) is used, but overestimations affect each age group in a different way. The access quality indicator shows that the population group in the worst situation is children and that stations in the centre of the network have higher access quality values. However, the synthetic accessibility indicator shows that potential demand is lower for the most central and most peripheral stations than for the stations located in the intermediate areas. It has been proved that both indicators are sensitive to changes in the spatial distribution of population groups within the catchment areas. These results demonstrate some of the advantages of the proposed methodology and argue in favour of its use in public transport planning.

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<p>El objetivo del presente trabajo es analizar por medio de la Teoría de Grafos la red vial de la Provincia de Corrientes, para determinar desigualdades en la accesibilidad, conectividad y centralidad de la misma. Según esta Teoría el espacio geográfico se reduce a un grafo, es decir, un dibujo compuesto por arcos y nodos que representan a elementos de la realidad, como rutas y las intersecciones de las mismas o ciudades respectivamente. Generado el grafo a partir de las rutas pavimentadas, se procede a la construcción de las matrices de datos (conectividad y accesibilidad), al cálculo de índices con diferentes niveles de complejidad, y la elaboración de una cartografía que expresa las relaciones topológicas. Pese a su carácter preferentemente descriptivo, es posible evidenciar algunos desequilibrios en la estructura espacial de la red vial.</p><p> </p>