When was the Michigan International Speedway built?
Michigan International Speedway
In 1972, Roger Penske purchased the speedway for an estimated $2million. During Penske's ownership the track was upgraded several times from the original capacity to 125,000 seating capacity. From 1996 to 2000, the track was referred to as Michigan Speedway. This was to keep consistency with other tracks owned by Roger Penske's Motorsports International before its merger with ISC.[3]