Swedish company Koenigsegg's Agera RS hypercar has become the world's fastest production car with an average speed of 447.2 kmph (277.9 mph). The car broke the previous record of 430.9 kmph, set in 2010 by the Bugatti Veyron Super Sport. The average speed was achieved during two runs which were held on a 17.7-kilometre-long section of highway in Nevada, US.