Work starts Wednesday along Lake Shore Boulevard to build the track for the Honda Indy.
Two lanes in each direction between Strachan Avenue and Ontario Drive will be closed nightly until July 17.
Lake Shore Boulevard will be completely closed for the race weekend, July 18-20, and will fully re-open the following Monday at 6 a.m.
The event includes two full Indy car races, a local craft beer garden, food trucks, and race-related displays.
Click here for more information on the Honda Indy.