NASCAR's Chicago Street Race will affect traffic around Grant Park for over a month. City officials released details about road closures and traffic patterns leading up to the races over July 4th weekend. The two-point-two-mile course is set to close the major thoroughfares of DuSable Lake Shore Drive, Columbus Drive and Michigan Avenue. The earliest pre-race closures begin June 2nd, when parking restrictions start on Columbus Drive between Jackson and Balbo.