In 2009 and 2010, floristic research was carried at two sites in Wrocław, Poland. The first site was along 3.5 km stretch of the newly built city ring road between Bielany and Oporów. The second site was along a newly built road near the post office in Oporów. The aim of the study was to determine whether spatial and technical urbanization in the area has favored the development of a variety of segetal and ruderal communities. The sites examined were divided into four parts. Part 1 comprised the 2 to 3 meter wide zone immediately adjacent to the road. Part 2 comprised the 10 to 15 meter wide zone which had been used to load soil when the road was being built. Part 3 comprised wastelands, and Part 4 comprised cultivated fields. 11 species were found in Part 1, 64 in Part 2, 42 in Part 3, and 17 in Part 4. The appearance of different species did not last long because during construction, the soil screes in Part 2 were eliminated and the plants growing there were damaged. For two or three years after road construction was finished, many species were found in Parts 1 and 3, which increased the richness of the flora along the the Wrocław ring road.