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
IndyCar Grand Prix Indianapolis was proposed, with a goal of attracting a Formula One or CART Indy car race. The layout encompassed roads near the Hoosier Dome and Indianapolis Zoo. The plan never materialized. IndyCar Grand Prix The IndyCar Grand Prix is an IndyCar Series race at the Indianapolis Motor Speedway in Speedway, Indiana. The race takes place in early May on the combined road course at the Speedway. The inaugural running occurred in 2014. The race is run on a newer, modified layout of the circuit previously used for the Formula One United States Grand Prix, and later the Moto GP motorcycle