1.   NASCAR has also employed roof flaps, aerodynamic devices that help stabilize a car when it is in danger of losing contact with the ground.

2.   In addition, new aerodynamic devices were ordered this year to make it easier to pass.

3.   The governing body is constantly tinkering with spoilers and other aerodynamic devices to prevent one make of car from having a clear advantage over another.

4.   The new aerodynamic devices make a bigger hole in the air, sapping horsepower, promoting drafting and bringing back the traditional slingshot-style pass.