 Complete the following phrase:  The 1970 running is considered by many to be the best 12 Hours of Sebring ever. This was the first 12 Hours of Sebring where the cars used a rolling start, a procedure similar to the start which is used at the Indianapolis 500, and has been used at every Sebring 12 Hours to this day. Before 1970, the drivers did a traditional Le Mans start, but the events of the 