The end of summer and beginning of the school year means major setbacks for drivers in Denton. In the past week motorists report significant increases in traffic triggered by the return of school and big end-of-the-summer events to town. "It is horrible everywhere you go," said University of North Texas student Charles Atchinson. The biggest problem spots seem to be around the UNT and Texas Woman's University, where the return of students significantly adds to the city's population each year and to the traffic flow on the streets. "6,000 folks in the housing," said UNT Transportation Director