1938 the firs official rule book of nascar was composed!

Mechanic William France, Sr., moved to Daytona Beach, Florida, from Washington, DC, in 1935 to escape the Great Depression. He was familiar with the history of the area from the land speed record attempts. France entered the 1936 Daytona event, finishing fifth. He took over running the course in 1938. He promoted a few races before World War II. France had the notion that people would enjoy watching "stock cars" race. Drivers were frequently victimized by unscrupulous promoters who would leave events with all the money before drivers were paid. In 1947, he decided this racing would not grow without a formal sanctioning organization, standardized rules, regular schedule, and an organized championship. On December 14, 1947, France began talks with other influential racers and promoters at the Ebony Bar at the Streamline Hotel at Daytona Beach, Florida, that ended with the formation of NASCAR on February 21, 1948. NASCAR was founded by William France, Sr., on February 21, 1948, with the help of several other drivers of the time. The points system was written on a bar room napkin. The original plans for NASCAR included three distinct divisions: Modified, Roadster, and Strictly Stock.[5] The Modified and Roadster classes were seen as more attractive to fans.[5] It turned out that NASCAR fans wanted nothing to do with the Roadsters, which fans perceived as a Northeast or Midwest series.[5] The Strictly Stock division was put on hold as American automobile manufacturers were unable to produce family sedans quickly enough to keep up with post-World War II demand.[5] The 1948 schedule featured 52 Modified dirt track races. The sanctioning body hosted its first event at Daytona Beach on February 15, 1948. Red Byron beat Marshall Teague in the Modified division race. Byron won the 1948 national championship. Things had changed dramatically by 1949, and the Strictly Stock division was able to debut with a 20-mile (32 km) exhibition in February near Miami.