Auto racing has existed since the invention of the automobile. Races of various sorts were organised, with the first recorded as early as 1867. Many of the earliest events were effectively reliability trials, aimed at proving these new machines were a practical mode of transport, but soon became an important way for competing makers to demonstrate their machines. By the 1930s, specialist racing cars had developed.
There are now numerous different categories, each with different rules and regulations.
In many types of auto races, particularly those held on closed courses, flags are displayed to indicate the general status of the track and to communicate instructions to competitors. While individual series have different rules, and the flags have changed from the first years (e.g., red used to start a race), these are generally accepted.
Aerodynamics
Aerodynamics and airflow play big roles in the setup of a racecar. Aerodynamic downforce improves the race car's handling by lowering the center of gravity and distributing the weight of the car equally on each tire.[14] Once this is achieved, fuel consumption decreases and the forces against the car are significantly lowered. Many aerodynamic experiments are conducted in wind tunnels, to simulate real life situations while measuring the various drag forces on the car.[15] These "Rolling roads" produce many wind situations and direct air flow at certain speeds and angles.[16] When a diffuser is installed under the car, the amount of drag force is significantly lowered, and the overall aerodynamics of the vehicle is positively adjusted.[15] Wings and canards channel the airflow in the most efficient way to get the least amount of drag from the car. It is experimentally proven that downforce is gained and the vehicles handling is considerably changed when aerodynamic wings on the front and rear of the vehicle are installed.
https://en.m.wikipedia.org/wiki/Car_racing
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