The data refer to communal and local urban roads (including bridges) to 1998; from 1999 on, they refer to communal roads in urban areas and communal roads in rural areas. The information concerns district, regional and national roads and bridges (in rural and urban areas). Up to reference period 2001 the road vehicles data are based on the report T-03; from reference period 2002 onwards the road vehicles data are based on administrative source ( district vehicle registers data base). The railway transport data are based on the PKP reports and the air transport data (LOT, PL, TL) reports. The information about postal offices to 2001 including telecommunication service offices. The telephone subscribers data refer to the wire telephone network. The postal and telecommunication services data are based on the ŁP and ŁT reports.