indy car racing
Indy car racing is named after the Indianapolis 500 and look much like a Formula One car, with monocoque construction, a single seat in an open cockpit, and open wheels. Indy cars use aerodynamics as well, like wings and a ground-effects panel to force the car into the track. Indy cars burn methanol, which doesn’t ignite as easily as gasoline and provides maximum horsepower without overheating the engine. Indy races are held on oval tracks (California Speedway) as well as on road courses (Road America) and are between 150 to 200 miles long, with cars reaching speeds of 200 miles per hour on an oval track. The most famous Indy race is the Indianapolis 500, with a first place prize that has been as much as $1 million.

infield
Oval tracks are enclosed loops. Anything inside this loop is referred to as the infield, and it usually must be accessed by tunnels or bridges so vehicle and foot traffic do not interfere with the racing surface.

interval
The time-distance between two cars. Referred to roughly in car lengths, or precisely in seconds.