The Autodromo Hermanos Rodriguez (or in English "Rodriguez Brothers Racetrack") is a 4.421 km (2.747-mi) race track in Mexico City, Mexico named for the famous Rodriguez brothers. Built in a park in 1962, the circuit hosted its first Formula One Mexican Grand Prix one year later. The circuit remained part of the F1 calendar through 1970, when spectator overcrowding caused unsafe conditions. When the track re-opened in 1986, the circuit boasted a new pit complex, as well as improve safety all around. The Autodromo Hermanos Rodriguez (as of 2006) has been the only venue for the Mexican Grand Prix.