Wind-tunnel tests are used to find ways to help the cars slice more quickly through the air. The area on oval tracks on the inside of the racing surface closest to the infield. Also where drivers exit pit lane. Can be affected by humidity and temperature of the track. Oval tracks are slanted away from the outside retaining wall to help the cars stay on the racing surface.
Banking typically is several degrees more in the corners than on the straightaways.
The chassis of a typical Indy car is made of carbon fiber and aluminum. Cars line up behind a pace car and travel at a restricted speed until the green flag is waved to resume racing. Teams prefer to make their pit stops during a caution because there is less risk of losing positions. Using the atmosphere like an airplane, the car is pushed against the track to make it corner better. The rear spoiler on a stock car captures the air coming off the roof and helps hold the rear of the car on the track.