The smile sticks out as he drives the No. 54 Audi for JDC-Miller Motorsports in the Continental Tire SportsCar Challenge. So does his other set of wheels — the wheelchair he uses when he's not behind the wheel.
"I do it (racing) to get myself out of the wheelchair. It's a big thing," said Johnson, who is paralyzed from the waist down. "I'm a totally separate person (in the car). I don't have to deal with any of the stresses in life. I can really just focus on what I'm really good at — driving a race car and having fun doing it.