Expansion tracks for formula dr r 1 sebring floridar 2 chicago illinoisr r stretching over almost 6 kilometers the sebring track in florida alternates between straight stretches quick curves and slow technical turns plotted over a former military training camp turned into an airfield this track has been a staple in north america since the 1930rsquos each year the 12 hours of sebring take place there an endurance race whose slightly uneven course gives drivers the chance to test