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 short track is an oval track less than or equal to 1 mile in length.
An intermediate track is an oval track >greater than 1 mile but less than 2 miles.
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 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.