The most significant change to the track, a new segment known as "The Boot", was finished in time for the Formula One race in 1971. The start-finish line was moved to the new pit straight as planned. At the end of the backstretch, after the Loop-Chute, cars swept left into a new four-turn complex that departed from the old layout, curling left-hand downhill through the woods. The track followed the edge of the hillside to two uphill right-hand turns, over an exciting blind crest into a right-hand turn, down and up into a left-hand turn rejoining the old track.