Buses belong to the most important means of public transportation that significantly impact the economic and environmental aspects of people in different countries. This study has focused on studying the relationship between buses and their effect on GDP, road networks and population in Hungary, Poland, Czech and Slovakia. We evaluated the number of buses and the GDP per capita for each country for different years and examined the changes over time and the effect of increasing GDP per capita on the number of buses for these countries. We evaluated the transportation system for each country in terms of the number of buses, the area of the country, the paved road network, and the number of inhabitants with income levels there. Poland excels in the number of buses compared to its vast area and high population, but it is lagging in GDP per capita. Slovakia is the smallest in terms of its population and area but has the highest GDP per capita. The Czech Republic is the best in caring for the road network, constantly updating it, and adding newly paved roads and expressway sectors.