- OFF LINE
- Driving off the best racing line. Drivers will go off line to attempt a pass or to move out of the way of faster cars.
- ON THE THROTTLE
- A driver has the pedal to the metal.
- OPEN WHEEL
- Champ car style race cars, which are designed to have the suspension, wheels and tires, exposed, no fenders. Additionally, sprint cars, midgets and modifieds fall into this category.
- Over total lateness, meaning a rally car has fallen so far behind schedule it is excluded.
- A driver gains time and position on an opponent by applying the brakes later and deeper into a corner.
- OUTSIDE GROOVE
- The outside racing line. Sometimes a car will handle and perform better on the outside/inside line and a driver opts not to use the optimum groove.
- An oval-shaped track such as Atlanta Motor Speedway.
- A condition when the front of a car has more grip than the rear. This is the same as a car being "loose."
- A term commonly used by announcers meaning a pass.