Definition of yellow flag

The term "yellow flag" in a sporting context refers to a warning signal displayed to indicate dangerous conditions or hazards that may affect the safety of athletes or vehicles. In particular, it's commonly used in motorsports like Formula One and MotoGP to alert drivers that there is an increased risk of sliding or aquaplaning due to wind, rain or standing water. The origin of the "yellow flag" tradition comes from the use of signal flags in naval warfare in the late 1800s. The yellow flag, also known as the "Quarantine Flag," was flown to signal that a ship was infected with disease and should be avoided. It's unclear exactly where and when the flag signal started being used for motorsports, but it's believed to be around the 1920s or 30s when automobile and motorcycle races grew in popularity. Initially, yellow flags were used to mark a section of the track where a competitor's car had broken down, and as such, other drivers were warned to take extra caution through that area. As races became more competitive and dangerous, the usage of yellow flags expanded to include other hazardous situations, such as heavy rain or debris on the track. The current racing rules and protocols vary by sport, but the yellow flag remains a clear and recognizable signal for athletes to slow down and exercise caution.