After a 30-year absence, the Detroit Grand Prix is returning to downtown. Motorists should expect road closures, detours, and parking challenges. The Detroit News Guide provides comprehensive information about parking and ticketing. The event spans three days, beginning at 8:30 a.m. on Friday and concluding at 4 p.m. on Sunday. The main race is the IndyCar series, featuring additional races such as IMSA sports cars, Indy NXT drivers, and Trans Am series muscle cars. All races will take place on a 1.7-mile, nine-turn street course.