The development of the national road network, its constant expansion and modernization is the basis for the long-term economic and civilization advancement of the country. Before accession to the European Union in May 2004. Poland had the least developed road infrastructure among all the candidate countries. From 25.05.2003 in polish legal system is in force the Act concerning the preparation and implementation of investment in public roads. The intention of the legislature was to simplify the procedures for the preparation and realization of investments in public roads to enable creation of efficient transport connections via a modern network of highways, expressways and roads of other categories. Special road act is a legal tool by which the national road network can be developed efficiently and in a simplified way.