How car racing works.

Britannica defines automobile racing as professional and amateur sport practised worldwide on roads, tracks or closed circuits. Wikipedia groups the major categories as single-seater (open-wheel), touring car, stock car, sports car and endurance (including GT), drag racing, off-road and karting, with hillclimb, drifting and autocross among the others. What separates them for a newcomer is less the car than the way the result is decided.

Four ways to decide a winner

Wheel-to-wheel racing

Honda's Formula 1 explainer describes a Grand Prix weekend running Friday to Sunday with free practice, then qualifying to set the starting order, then the race. The full sequence, including Safety Car rules and points, is on the race weekend.

Several classes often share the track at once. At the 2026 24 Hours of Le Mans there were three classes, with Hypercar competing for overall victory alongside LMP2 and LMGT3, according to RacingNews365. RACER's guide says IMSA's WeatherTech SportsCar Championship runs four classes together (GTP, LMP2, GTD PRO and GTD), and that IMSA cars carry coloured LED panels showing each car's position within its own class. In sports car and endurance racing, Wikipedia notes, two or more drivers often take turns in one car.

Racing against the clock

Rally

Hyundai's WRC explainer describes a rally as several days of timed special stages on closed roads, connected by untimed road sections on public roads where normal traffic law applies and the cars must be road legal. Red Bull's guide says cars start each stage at intervals (it cites three minutes) and the winner has the lowest total time across all stages. Crews drive the stages slowly beforehand in a reconnaissance and write pace notes, which the co-driver reads aloud on the stage.

Rallycross

Peugeot Sport describes rallycross as a mix of rallying and circuit racing on short laps that alternate asphalt and gravel. Each driver must take the longer joker lap once per race. Unlike a rally, the cars race each other directly: the 2024 World RX format, as World RX describes it, runs heats from fixed side-by-side grids, two six-car semi-finals and a six-car final.

Time trials, time attack and hillclimb

SCCA Time Trials states that time trials are not wheel-to-wheel competition; cars share the track, but passing happens carefully in passing zones with a point-by. NASA Time Trial scores each driver on their fastest lap of the day. World Time Attack Challenge describes time attack the same way, with cars going out at intervals in search of one perfect lap. SCCA treats HillClimb as a type of Time Trials event run on a closed section of mountain road.

Autocross

SCCA calls its autocross programme Solo. The course is laid out with traffic cones in a parking lot or airfield, and the fastest time wins provided the driver does not hit cones or go off course. SCCA describes overall speeds as low. More is on autocross.

Drag racing: elimination rounds

NHRA describes a drag race as a timed acceleration contest from a standing start, run as a tournament in which the loser of each race is eliminated. Britannica notes the usual distance is a quarter mile. Starts are controlled by the "Christmas Tree" of lights. In bracket racing, Sonoma Raceway's NHRA brochure explains, each driver predicts their own elapsed time (the dial-in), the slower car gets a head start equal to the difference, and running quicker than your dial-in (a breakout) can lose the race.

Drifting: judged, not timed

The FIA defines drifting as intentionally triggered oversteer, judged on line, angle, style and speed. At the 2022 FIA Motorsport Games, solo qualifying runs were scored out of 100 (line 40, angle 30, style 20, speed 10). In tandem battles each pair runs twice, swapping lead and chase.

Classes

Many formats split cars into classes so that similar cars compete with each other. SCCA says its autocross classes cover different levels of modification. NASA Time Trial groups cars by adjusted weight-to-power ratio, from TT1 to TT6, with separate classes for electric vehicles. In professional sports car racing, IMSA's GTD PRO and GTD both use FIA GT3 cars, but GTD PRO is all-professional while GTD requires mixed professional and amateur lineups, according to RACER.

Who writes the rules

At international level the FIA publishes the International Sporting Code and its appendices. Appendix H (2026 edition, published 23 June 2026) covers the supervision of the road and emergency services, including flag signals, and Appendix L covers drivers' licences, medical examinations and drivers' equipment. The FIA also publishes a separate Esports International Sporting Code.

In the United States, a 2018 ACCUS document, still linked from SCCA's 2026 forms page, names ACCUS-FIA as the FIA's national authority, with IMSA, IndyCar, NASCAR, NHRA, SCCA and USAC as its member clubs. We could not confirm that list from a current source.

At club level the organizer's own rulebook governs. SCCA publishes the General Competition Rules (GCR) for road racing and separate Solo Rules for autocross, and tells new road racers to know the GCR's flag and close-quarters sections before they drive. NASA's rules are its Club Codes and Regulations (CCR). Individual events then add Supplemental or Supplementary Regulations and a drivers' briefing. SCCA notes, for example, that an event's Supplemental Regulations say which flags or lights it uses.

The practical point for anyone entering an event: read that event's rules and attend its briefing, because the details on this site may not match them. Start with flags, then getting started.