 because that's where the drivers are headed right now. To call the start for today's NASCAR XFINITY Series, Loop 110 for the Motor Racing Network from Grand Rapids, Michigan. Here's Jeff Striegel. 50 laps of racing, the 18th race of the season for the NASCAR XFINITY Series. 38 teams getting ready to go. 12 turns of street course racing in Chicago. The green flag is in the air, and the Loop 110 is underway. The field heads to turn one.