A short track is an oval track less 1 mile in length.
An intermediate track is an oval track quyal to or greater than 1 mile and less than 2 miles in length.
A superspeedway is a track with an oval, or D‑shaped oval configuration which is equal to or greater than 2 miles in length.
A road course is a race track comprised of both left‑hand and right‑hand turns, as opposed to an oval which is comprised exclusively of only left or right hand turns.
A restrictor plate is a device installed on the intake manifold of an engine which restricts air intake to the engine to limit its power. It is used on certain high‑speed tracks. NASCAR has since moved away from traditional restrictor places in favor of tapered spacers to reduce horsepower and speed.
Oval tracks are measured along a single line located exactly 15 feet from the outside wall. On road courses, they calculate the length by averaging the lengths of the inner and outer track edges.