Thomson Road Grand Prix circuit Thomson Road Grand Prix circuit The Thomson Road Grand Prix circuit was a former street circuit on Old Upper Thomson Road in Singapore. It hosted races from 1961 to 1973 under Formula Libre and Australian Formula 2 rules; races until 1965 are now considered part of the lineage of the Malaysian Grand Prix, and races after Singapore's independence in 1966 are considered part of the lineage of the Singapore Grand Prix. During the initial years, the main Motorcycle and Car Grand Prix lasted 60 laps, although this was eventually refined into two separate races - a preliminary 20 lap event
Detroit Grand Prix Detroit Grand Prix The title of Detroit Grand Prix was applied to the Formula One races held at the Detroit street circuit in Detroit, Michigan, United States of America from 1982 through 1988. In 1982, the U.S. became the first and only country to host three World Championship Grands Prix in one season. In addition to the United States Grand Prix West in Long Beach and the Las Vegas races, the new event was held in Detroit, Michigan on another street course encompassing the Renaissance Center, current headquarters of General Motors. The original circuit had seventeen corners in 2.493 miles,