The minimum spanning tree of Bulgaria's road network

The minimum spanning tree shows the "minimum wire" needed to connect all nodes in a network. In case of a road network, that would be the minimal road length. Notice the small mistake on the east side of the map and observe how the connections are formed. Reducing over-investments on road infrastructure is the only way to calm down poor people who have nothing on the table. Asphalt shouldn't become their main topic of conversation.