Accessibility indicators for regional economic development : an application to the regional distributive effects of high-speed rail in Spain

The inauguration of a HSR line increases the accessibility to people, resources, goods, and markets, which brings locational advantages, thus attracting new households, economic activities, allowing greater agglomerations. Intuitively, the locations where the accessibility increases higher than average may gain more economic opportunities and more growth. Accessibility indicators measure the relative location importance, affecting the attractiveness and economic development potentials of regions. They are also able to measure the disparities among regions to define how transport and development impacts are distributed across geographical areas or population. In order to evaluate the impacts of accessibility on the regional economic growth, choosing the most suitable accessibility indicator is rather crucial. To analyze how well different types of accessibility indicators are able to capture the spatial distributions of the regional economic variables, this paper is set to study the ex-post impacts of accessibility due to the HSR network expansion in the 2000s at provincial level in Spain and its relation to the evolution of several economic performance indicators (GDP, population, employment and number of firms) during the same time period. Four accessibility indicators corresponding to different conceptualizations are introduced: one location indicator, two economic potential indicators and one daily accessibility indicator. The study area and the zoning level for the analysis is comprised of 47 provinces in continental Spain. The visualization procedure for accessibility indicators and the economic variables is supported by ArcGIS® software. To calculate the accessibility values, travel times between all the municipalities by railway are computed for the year 2000 and 2010 using a GIS-based network with network analysis tool box in ArcGIS®. The relative changes of accessibility and economic variables for all the provinces of Spain are presented and analyzed. The distribution patterns of the accessibility indicators and economic variables are compared. The obtained results are expected to help better understanding the concept of accessibility and its explanatory power in the economic impact analysis