International Speedway Corporation was a corporation whose primary business was the ownership and management of motorsports race tracks. ISC was founded by NASCAR founder Bill France Sr. in 1953 for the construction of Daytona International Speedway and in 1999 it merged with Penske Motorsports to become one of the largest motorsports companies in North America. The company played an important, though controversial, role in the modernization of the sport. It worked with NASCAR to create new tracks and update older ones in an effort to improve the racing and the experience for spectators and has constructed popular new tracks in regions previously thought uninterested in NASCAR. Because both companies have several members of the France family in top positions, ISC's competitors have filed multiple lawsuits on antitrust grounds