What separates Formula 1 from all other forms of open wheel racing, is the basic premise of F1 revolves around the authentic important issue that each team is a "constructor". That is, the chassis of the car must be designed and manufactured in-house, and chassis can not be supplied to competitors on a "customer" basis. Engines are mainly funded and/or developed by established extreme motor manufacturers, and can be supplied exclusively to just precise team, or may be offered as "customer" engines, often to the smaller, lower-ranked teams.
Many series follow the Assemblage N regulation with a few exceptions. There are several disparate arrangement that are escape all over the world, most notably, Japan's Super Taikyu and IMSA's Racing School Firehawk Series which ran between the 1980s to 1990s all over the United States.