Ontario Motor Speedway was a motorsport venue located in Ontario, California. It was the first and only automobile racing facility built to accommodate major races sanctioned by all of the four dominant racing sanctioning bodies: USAC for open-wheel oval car races; NASCAR for a 500-mile oval stock car races; NHRA for drag races; and FIA for Formula One road course races. Constructed in less than two years, the track opened in August 1970 and was considered state of the art at the time.