Relay One
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| Category | Open-wheel single-seater Formula auto racing |
|---|---|
| Country | International |
| Inaugural season | 1959 |
| Drivers | 20 |
| Teams | 10 |
 Current season | |
Division I Relay Circuit Motorsport (also known as Relay I Racing, Relay One, or RC1) is the highest class of international racing for open-wheel single-seater relay circuit cars sanctioned by the International Relay Motorsport Federation (IRM).
An RC1 season consists of a series of races, known as Grands Prix, which take place worldwide on purpose-built circuits and closed public roads. A points system is used at Grands Prix to determine two annual World Championships: one for drivers, the other for constructors. Each driver must hold a valid Super Licence, the highest class of racing license issued by IRM. The Division I World Championship Series, known as the R1 Championship Grand Prix, has been one of the premier forms of racing worldwide since its inaugural season in 1959.