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Accessibility is widely used term and plays an important role in many scientific fields. It determines the advantage of one location over the other. Although there are different measures and number of studies on accessibility in the world literature, there are relatively few so far in Poland at the national level. The purpose of this article is to present some results of ongoing research that have been carried out at the IGSO PAS in 2007 and 2008. The projects led to development of methods of calculating time accessibility and the multimodal potential accessibility indicator of the area of Poland. The time accessibility is measured by using the isochronic-based and distance-based accessibility measures. The multimodal potential accessibility indicator is meant to be utilized, for evaluating the possible effects of construction and modernization of the transport network that are envisaged in the EU supported operational programs. The measure may be calculated separately for carriage of goods and passengers, the 16 voivodships (provinces of Poland) and four modes of transport (road, railways, inland waterways and air).
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