 Complete the following phrase:  After the 1954 running, work began on entirely revamping the circuit. New facilities were built and a new corner, the Parabolica, was built right before the pits. Extra track used for a short course was eliminated. The biggest change was the construction of the new Monza banking. Built on top of where the almost flat, narrow original banking was, these huge concrete bankings, called the sopraelevata curves, were built in the same shape as the original banking had been. The only significant difference was that the Curva Sud was moved slightly to the north. This course was combined with the road course for the 1955 event, which was won by Fangio and was the last race contested by a full-fledged Mercedes factory effort in Formula One until 2010. The 10 km Monza circuit was now so fast that F1 cars were averaging 135 mph per lap- though rather unremarkable by todays standards, these average speeds were even faster than the Indianapolis Speedway oval in the United States. 