In stock car racing, did the steel cage replace the roll bar?

Question

Or can a stock car have both a steel cage and a roll bar?

Answer 1

All of the tubing that is used to build a cup car is made of steel. A roll bar is just part of the whole "cage" that makes up the car.

Answer 2

In any race car, a roll cage is in place of a roll bar, as all the parts found in a roll bar are part of the cage.