Downtown Chicago course presents significant challenge for NASCAR Cup Series

Preparation continues for the inaugural NASCAR Chicago Street Race Weekend Friday, June 30, 2023, in downtown Chicago. (AP Photo/Erin Hooley)

CHICAGO (AP) — There are seven 90-degree turns. There are manhole covers, and transitions from concrete to asphalt and back. The margin for error is small, and any rain will make the course exponentially more difficult.