Chaddick Institute at DePaul University tracks U.S. intercity bus trends A Greyhound bus makes a stop at Chicago's Union Station to load and unload passengers. Intercity bus travel is expected to be at its highest level for the 2015 Labor Day holiday in at least a decade, find researchers from DePaul’s Chaddick Institute for Metropolitan Development. (Photo by Jeff Carrion) CHICAGO--(ENEWSPF)--August 20, 2015. Late summer vacations, college kids on the move and travelers headed to family events will result in hundreds of intercity buses being "sold out" over the Labor Day holiday, according to . . .