The paper aims at determining the influence of the accession of Poland to the European Union on financing and scope of road projects in Warmia and Mazury voivodeship. The material for the study was obtained from the Voivodeship Roads Management (VRM) in Olsztyn, which is responsible for administration, maintenance and development of the roads network in Warmia and Mazury voivodeship. The paper presents the current sources for road projects financing in Poland. On the basis of the study it was established that the accession of Poland to the European Union had a positive influence on road infrastructure development in Warmia and Mazury voivodeship mainly through increasing the number of sources of financing. After gaining the status of a European Union member by Poland the share of funds allocated for current maintenance of roads in the structure of expenditures of the Voivodeship Roads Management in Olsztyn decreased while the share of funds for new road projects increased.