The document discusses the relationship between land use allocation and traffic flows in the Attica basin region of Greece. It analyzes recorded daily traffic counts from 1991 to identify three categories of roads based on vehicle volumes. It then uses principal component analysis to identify three main functional components of economic activities in the region: 1) functional centers and light manufacturing, 2) industrial and supplementary land uses, and 3) central business districts. The analysis finds that the allocation of these economic activity components is strongly associated with the road categories, with functional centers located along lower-volume roads, industries located along higher-volume roads, and central business districts also located along higher-volume roads. The study concludes the functional and traffic structures of the Attica basin have